TREATMENT SYSTEM AND METHOD FOR RURAL BLACK AND ODOROUS WATER AND MANURE

Abstract

The present invention provides a treatment system and method for rural black and odorous water and manure. The treatment method includes: (1) sending manure into a solid-liquid separation system, adding straws and/or saw-dust and chaff to solid obtained after the solid-liquid separation, adjusting a carbon-nitrogen ratio, sending into a solid aerobic fermentation system for aerobic fermentation, and then aging to produce organic fertilizer; (2) sending liquid obtained after the solid-liquid separation into a liquid anaerobic fermentation system for deep anaerobic fermentation; (3) sending biogas slurry after the deep anaerobic fermentation to a bio-membrane filter tank and a fibrous filter tank for treatment; (4) irrigating crops with the treated liquid or reusing the treated liquid in the farmland; and (5) soaking straws in manure slurry of a straw hydrolysis tank for hydrolysis, then pumping the softened straws to the solid-liquid separation system by using a cutting pump.

Claims

1. A treatment method for rural black and odorous water and manure, comprising: (1) sending manure into a solid-liquid separation system, adding an appropriate amount of straws and/or saw-dust and chaff into solid obtained after the solid-liquid separation, adjusting a carbon-nitrogen ratio to 20-30 and water content to 50%-70%, then sending into a solid aerobic fermentation system for aerobic fermentation, and then aging to obtain organic fertilizer; (2) sending the manure into the solid-liquid separation system, homogenizing liquid obtained after the solid-liquid separation by a regulating tank, and sending into a liquid anaerobic fermentation system for deep anaerobic fermentation; (3) sending biogas slurry after the deep anaerobic fermentation in step (2) to a bio-membrane filter tank for aerobic biochemical treatment, sending sewage treated by the bio-membrane filter tank into a fibrous filter tank for filtering, and making the sewage reach requirements of relevant farmland irrigation water quality standard and emission standard; (4) carrying out the water-fertilizer integrated irrigation for peripheral crops using one part of the liquid treated in step (3), and sterilizing the other part to be reused for flushing fences; (5) in a region where the straws can be collected, arranging straw hydrolysis tanks, loading the manure slurry into the straw hydrolysis tanks, cutting the straws into segments, soaking the straw segments in manure slurry of the straw hydrolysis tanks for hydrolysis, wherein the straw hydrolysis tanks are multiple; after the straws soaked in one straw hydrolysis tank reach the soaking time, pumping the softened straws into the solid-liquid separation system by using a cutting pump, mixing the straws obtained from the solid-liquid separation with manure, adjusting the carbon-nitrogen ratio to 20-30, and sending to the solid aerobic fermentation system for aerobic fermentation to produce organic fertilizer; and homogenizing the liquid obtained from the solid-liquid separation by the regulating tank, sending to the liquid anaerobic fermentation for anaerobic fermentation, carrying out the aerobic biochemical treatment in the bio-membrane filter tank, then sending into the fibrous filter tank for filtering, and making the sewage meet the requirements of relevant farmland irrigation water quality standard and emission standard.

2. A treatment system for rural black and odorous water and manure, comprising a solid-liquid separation system, a solid aerobic fermentation system, a liquid anaerobic fermentation system, a bio-membrane filter tank, a fibrous filter tank, a cutting pump, connection pipelines and a straw hydrolysis tank, wherein a manure outlet is connected with the solid-liquid separation system and/or the manure outlet is connected with the straw hydrolysis tank, and straws of the straw hydrolysis tank are conveyed to the solid-liquid separation system through the cutting pump and the connection pipeline; solid of the solid-liquid separation system is conveyed to the solid aerobic fermentation system, and the output of the solid aerobic fermentation system is aged to produce the organic fertilizer; and liquid separated from the solid-liquid separation system is outputted to the regulating tank, sewage of the regulating tank is connected and conveyed to the liquid anaerobic fermentation system, biogas slurry outputted by the liquid anaerobic fermentation system is connected to the bio-membrane filter tank, the sewage treated by the bio-membrane filter tank is sent to the fibrous filter tank, and the filter water of the fibrous filter tank is used for farmland irrigation or reuse.

3. The treatment system for rural black and odorous water and manure according to claim 2, wherein the solid-liquid separation system comprises a spiral squeezing solid-liquid separator and an inclined-sieve solid-liquid separator; and the liquid squeezed by the spiral squeezing solid-liquid separator is conveyed to the inclined-sieve solid-liquid separator for continuous solid-liquid separation.

4. The treatment method for rural black and odorous water and manure according to claim 1, wherein the liquid anaerobic fermentation system is formed by connecting N anaerobic soft boigas digesters in series; N1; when the quantity of the anaerobic soft biogas digesters is greater than 1, the first anaerobic soft biogas digester with liquid feed is an anaerobic hydrolysis acidification tank, and the total capacity of the anaerobic soft biogas digesters connected in series is designed to be ten times or more than ten times of the liquid volume fed everyday to ensure the full anaerobic fermentation of the produced liquid; the bottoms of the biogas digesters descend gradually, the bottom of the previous anaerobic soft biogas digester has a sludge guiding pipeline connected with the next anaerobic soft biogas digester, so that sludge settled in the previous biogas digester flows to the next biogas digester through the sludge guiding pipeline; and a sludge discharging pipe arranged at a lowest position on the bottom of each anaerobic soft biogas tank can periodically discharge the sludge to prevent the accumulation of the sludge inside the anaerobic soft biogas digester, and the supernatant of the last biogas digester flows into the bio-membrane filter tank.

5. The treatment method for rural black and odorous water and manure according to claim 1, wherein biogas generated by the liquid anaerobic fermentation system provides a heat source to a reactor of the solid aerobic fermentation system for realizing the high-temperature aerobic fermentation and/or provides the heat source to the liquid anaerobic fermentation system for realizing medium-temperature anaerobic fermentation, and provides the heat source to breeding sheds for livestock and poultry breeding.

6. The treatment method for rural black and odorous water and manure according to claim 1, wherein the bio-membrane filter tank refers to a bio-turnplate bio-membrane biochemical reactor or a submerged lifting cycling bio-membrane filter tank.

7. The treatment method for rural black and odorous water and manure according to claim 6, wherein the submerged lifting cycling bio-membrane filter tank adopts two groups of filter screens which have equal weight and are symmetrically and alternately distributed; under the action of a lifting mechanism, the two groups of filter screens rise and fall periodically in the bio-membrane filter tank, so that bio-membranes on the two groups of filter screens contact the air and sewage in turn; the bio-membranes absorb organic matters in the sewage when descending and submerging, and absorb oxygen when rising in the air so as to bring the oxygen into the sewage during the next descending and submerging and to cause the turbulence of the sewage in a water channel, so that the dissolved oxygen is uniformly distributed, and the sewage is purified.

8. The treatment method for rural black and odorous water and manure according to claim 1, wherein the fibrous filter tank adopts a reciprocating-suction fibrous filter tank; filter holes are symmetrically arranged between a sewage tank and a filtrate tank; a filter plate is installed and fixed on the filter holes; sewage in the sewage tank is filtered by the filter plate to enter the filtrate tank; one side of the sewage tank of the filter plate is provided with a sludge sucker; the sludge sucker makes up-down or horizontal synchronous motion in opposite directions to suck the sludge under the action of the driving mechanism; when the filter plate is blocked, the liquid level of the sewage in the sewage tank rises; and when the liquid level of the sewage in the sewage tank reaches a liquid level set by a liquid sensor, an electric control system controls and starts the sludge sucker to back suck the sludge on the filter plate and also starts the driving mechanism to drive the sludge sucker to make up-down or horizontal synchronous motion in opposite directions to suck away the sludge on the filter plate, so that the filter plate can restore the filter capacity.

9. The treatment method for rural black and odorous water and manure according to claim 1, wherein the straws are cut into straw segments with a length of 1-3 cm.

10. The treatment method for rural black and odorous water and manure according to claim 1, wherein the liquid obtained after the solid-liquid separation is sent into the liquid anaerobic fermentation system for deep anaerobic fermentation for more than 20 days.

Description

DESCRIPTION OF THE DRAWINGS

[0040] FIG. 1 is a flow chart of the present invention;

[0041] FIG. 2 is a structural diagram of an embodiment of a solid aerobic fermentation system of the present invention;

[0042] FIG. 3 is a structural diagram of an embodiment of a liquid anaerobic fermentation system of the present invention;

[0043] FIG. 4 is a structural diagram of an embodiment of a bio-membrane filter tank of the present invention;

[0044] FIG. 5 is a structural diagram of embodiment 1 of a fibrous filter tank of the present invention;

[0045] FIG. 6 is an A-A view of FIG. 5;

[0046] FIG. 7 is a structural diagram of embodiment 2 of the fibrous filter tank of the present invention;

[0047] FIG. 8 is a B-B view of FIG. 7;

[0048] FIG. 9 is a flow chart of a combination I of optimal feasible technologies for anaerobic digestion of livestock and poultry manure in the prior art; and

[0049] FIG. 10 is a flow chart of a combination II of optimal feasible technologies for anaerobic digestion of livestock and poultry manure in the prior art;

DESCRIPTION OF NUMERALS IN THE DRAWINGS

[0050] 1Spiral feeding machine; 2exhaust pipe; 3left side sealing cap; 4bearing inner ring; 5bearing outer ring; 6cylinder fermenter; 7shoveling plate; 8glove connection pipe; 9heat exchanging water sleeve; 10insulating layer; 11water sleeve water inlet pipe; 12right side sealing cap; 13air intake pipe; 14right-handed connector; 15cycling water inlet pipe; 16spiral discharging machine; 17right carrier roller group; 18supporting steel ring; 19electric motor; 20coupler; 21speed reducer; 22small gear; 23outer gear ring; 24left carrier roller group; 25sealing ring; 26water sleeve water outlet pipe; 27left-handed connector; 28cycling water outlet pipe; 29liquid inlet pipe; 30first anaerobic soft biogas digester; 31sludge guiding pipeline; 32second anaerobic soft biogas digester; 33supernatant discharging pipe; 34bio-membrane filter tank; 35liquid discharging pipe; 36fibrous filter tank; 37submerged lifting cycling bio-membrane filter tank; 38bio-membrane filter screen A; 39bio-membrane filter screen B; 40bearing frame; 41lifting mechanism; 42water inlet groove; 43sewage tank; 44filtrate tank; 45water outlet channel; 46filter plate A; 47filter plate B; 48sludge sucker A; 49sludge sucker B; 50lifting mechanism; 51fibrous filter tank lifting guide rail A; 52fibrous filter tank lifting guide rail B; 53fibrous filter tank lifting guide rail C; 54limiting sensor; 55liquid level sensor; 56settled sludge pump; 57effluent weir; 58transition power; 59transition guide rail.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

[0051] By referring to the figures, a treatment method for rural black and odorous water and manure in the present invention includes:

[0052] (1) sending manure into a solid-liquid separation system, adding an appropriate amount of straws and/or saw-dust and chaff into solid obtained after the solid-liquid separation, adjusting a carbon-nitrogen ratio to 20-30 and water content to 50%-70%, then sending into a solid aerobic fermentation system for aerobic fermentation, and then aging to obtain organic fertilizer;

[0053] (2) sending the manure into the solid-liquid separation system, homogenizing liquid obtained after the solid-liquid separation by a regulating tank, and sending into a liquid anaerobic fermentation system for deep anaerobic fermentation;

[0054] (3) sending biogas slurry after the deep anaerobic fermentation in step (2) to a bio-membrane filter tank for aerobic biochemical treatment, sending sewage treated by the bio-membrane filter tank into a fibrous filter tank for filtering, and making the sewage reach requirements of relevant farmland irrigation water quality standard and emission standard;

[0055] (4) carrying out the water-fertilizer integrated irrigation for peripheral crops using one part of the liquid treated in step (3), and sterilizing the other part to be reused for flushing fences;

[0056] (5) in a region where the straws can be collected, arranging straw hydrolysis tanks, loading the manure slurry into the straw hydrolysis tanks, cutting the straws into segments, soaking the straw segments in manure slurry of the straw hydrolysis tanks for hydrolysis, wherein the straw hydrolysis tanks are multiple; after the straws soaked in one straw hydrolysis tank reach the soaking time (soaking time required for different straws is different), pumping the softened straws into the solid-liquid separation system by using a cutting pump, mixing the straws obtained from the solid-liquid separation with manure, adjusting the carbon-nitrogen ratio to 20-30, and sending to the solid aerobic fermentation system for aerobic fermentation to produce organic fertilizer; and homogenizing the liquid obtained from the solid-liquid separation by the regulating tank, sending to the liquid anaerobic fermentation for anaerobic fermentation, carrying out the aerobic biochemical treatment in the bio-membrane filter tank, then sending into the fibrous filter tank for filtering, and making the sewage meet the requirements of relevant farmland irrigation water quality standard and emission standard.

[0057] A treatment system for the rural black and odorous water and manure includes a solid-liquid separation system, a solid aerobic fermentation system, a liquid anaerobic fermentation system, a bio-membrane filter tank, a fibrous filter tank, a cutting pump, connection pipelines and a straw hydrolysis tank; a manure outlet is connected with the solid-liquid separation system and/or the manure outlet is connected with the straw hydrolysis tank, and straws of the straw hydrolysis tank are conveyed to the solid-liquid separation system through the cutting pump and the connection pipeline; solid of the solid-liquid separation system is conveyed to the solid aerobic fermentation system, and the output of the solid aerobic fermentation system is aged to produce the organic fertilizer; and liquid separated from the solid-liquid separation system is outputted to the regulating tank, sewage of the regulating tank is connected and conveyed to the liquid anaerobic fermentation system, biogas slurry outputted by the liquid anaerobic fermentation system is connected to the bio-membrane filter tank, the sewage treated by the bio-membrane filter tank is sent to the fibrous filter tank, and the filter water of the fibrous filter tank is used for farmland irrigation or reuse.

[0058] The solid-liquid separation system includes a spiral squeezing solid-liquid separator and an inclined-sieve solid-liquid separator. The liquid squeezed by the spiral squeezing solid-liquid separator is conveyed to the inclined-sieve solid-liquid separator for continuous solid-liquid separation. The solid and the liquid are conveyed to the solid aerobic fermentation system, and the liquid is conveyed to the regulating tank.

[0059] The liquid anaerobic fermentation system is formed by connecting N anaerobic soft boigas digesters in series; N1; when the quantity of the anaerobic soft biogas digesters is greater than 1, the first anaerobic soft biogas digester with liquid feed is an anaerobic hydrolysis acidification tank, and the total capacity of the anaerobic soft biogas digesters connected in series is designed to be ten times or more than ten times of the liquid volume fed everyday to ensure the full anaerobic fermentation of the produced liquid; the bottoms of the biogas digesters descend gradually, the bottom of the previous anaerobic soft biogas digester has a sludge guiding pipeline connected with the next anaerobic soft biogas digester, so that sludge settled in the previous biogas digester flows to the next biogas digester through the sludge guiding pipeline; and a sludge discharging pipe arranged at a lowest position on the bottom of each anaerobic soft biogas tank can periodically discharge the sludge to prevent the accumulation of the sludge inside the anaerobic soft biogas digester, and the supernatant of the last biogas digester flows into the bio-membrane filter tank.

[0060] Biogas generated by the liquid anaerobic fermentation system provides a heat source to a reactor of the solid aerobic fermentation system for realizing the high-temperature aerobic fermentation and/or provides the heat source to the liquid anaerobic fermentation system for realizing medium-temperature anaerobic fermentation, and provides the heat source to breeding sheds for livestock and poultry breeding.

[0061] The bio-membrane filter tank refers to a bio-turnplate bio-membrane biochemical reactor or a submerged lifting cycling bio-membrane filter tank.

[0062] The submerged lifting cycling bio-membrane filter tank adopts two groups of filter screens which have equal weight and are symmetrically and alternately distributed. Under the action of a lifting mechanism, the two groups of filter screens rise and fall periodically in the bio-membrane filter tank, so that bio-membranes on the two groups of filter screens contact the air and sewage in turn. The bio-membranes absorb organic matters in the sewage when descending and submerging, and absorb oxygen when rising in the air so as to bring the oxygen into the sewage during the next descending and submerging and to cause the turbulence of the sewage in a water channel, so that the dissolved oxygen is, uniformly distributed, and the sewage is, purified.

[0063] The fibrous filter tank adopts a reciprocating-suction fibrous filter tank. Filter holes are symmetrically arranged between a sewage tank and a filtrate tank. A filter plate is installed and fixed on the filter holes. Sewage in the sewage tank is filtered by the filter plate to enter the filtrate tank. One side of the sewage tank of the filter plate is provided with a sludge sucker. The sludge sucker makes up-down or horizontal synchronous motion in opposite directions to suck the sludge under the action of the driving mechanism. When the filter plate is blocked, the liquid level of the sewage in the sewage tank rises; and when the liquid level of the sewage in the sewage tank reaches a liquid level set by a liquid sensor, an electric control system controls and starts the sludge sucker to back suck the sludge on the filter plate and also starts the driving mechanism to drive the sludge sucker to make up-down or horizontal synchronous motion in opposite directions to suck away the sludge on the filter plate, so that the filter plate can restore the filter capacity.

[0064] The straw hydrolysis tank is an ordinary concrete water tank. The water tank is subjected to the anti-seepage treatment. The straw hydrolysis tank plays a role in soaking feces and straws, so that the straws are hydrolyzed and softened.

[0065] The regulation tank is an ordinary concrete water tank. The water tank is subjected to the anti-seepage treatment and has a main function of homogenizing the liquid entering the anaerobic fermentation system and uniformly stabilizing the liquid output, thereby facilitating the subsequent anaerobic fermentation and stable biochemical treatment of the bio-membrane method.

[0066] The solid aerobic fermentation system includes an aerobic fermentation reactor, a cycling water or cycling oil system, an air intake and exhaust system, a detection system and a control system. A horizontal roller of the aerobic fermentation reactor is provided with a water sleeve, and two side sealing caps of the horizontal roller are provided with a material inlet, a material outlet and an air inlet and a vent hole. The cycling water or cycling oil system is connected and communicated with the water sleeve on the horizontal roller, and the air intake and exhaust system is connected and communicated with the air inlet and the vent hole on the sealing caps of the horizontal roller. The detection system is provided with a temperature detection apparatus on a water inlet pipe and a water outlet pipe of the aerobic fermentation reactor. A material outlet side of the aerobic fermentation reactor is provided with an oxygen content detection apparatus, and a material temperature detection apparatus is arranged in the aerobic fermentation reactor. The detection apparatus outputs a detection signal to a control system. The control system controls the cycling water or cycling oil system, the air intake and exhaust system, the aerobic fermentation reactor and an outer feeding and unloading apparatus.

[0067] The straws are cut into straw segments with a length of 1-3 cm.

[0068] The liquid obtained after the solid-liquid separation is sent into the liquid anaerobic fermentation system for deep anaerobic fermentation for more than 20 days.

[0069] Referring to FIG. 2 (a structural diagram of an embodiment of a solid aerobic fermentation system of the present invention), the solid aerobic fermentation system adopts a horizontal roller rolling-type aerobic fermentation device with a heat exchanger and adopts a structure as follows: a horizontal cylinder fermenter is supported by a carrier roller group. The left end and the right end of the cylinder fermenter are respectively provided with a bearing. Two ends of the cylinder fermenter are connected with a left side sealing cap and a right side sealing cap through a bearing outer ring and a bearing inner ring. The cylinder fermenter, the bearings and the sealing caps form a closed fermentation space. A spiral feeding machine, an exhaust pipe, a spiral discharging machine and an air intake pipe are separately installed on the left side sealing cap and the right side sealing cap. A cylindrical heat exchanging water sleeve is coaxially arranged outside the cylinder fermenter. An electric motor, a coupler, a speed reducer and a small gear are connected in sequence. The small gear is engaged with an outer gear ring on the cylinder fermenter.

[0070] Referring to FIG. 3 (a structural diagram of an embodiment of a liquid anaerobic fermentation system of the present invention), in FIG. 3, an anaerobic soft biogas digester is a known technology. In the present invention, two anaerobic soft biogas digesters are connected in series.

[0071] Referring to FIG. 4 (structural diagram of embodiments of a bio-membrane filter tank of the present invention), a bio-membrane filter tank of the present invention adopts a submerged lifting cycling bio-membrane filter tank. The submerged lifting cycling bio-membrane filter tank includes a bio-membrane filter tank, a bearing frame, two groups of filter screens with equal weight, a lifting mechanism, a pulley block and two groups of anti-swing guide rails. The lifting mechanism is installed on a middle position above a crossbeam of the bearing frame, and the bearing frame stretches across above the bio-membrane filter tank and is fixed on the ground or on a bio-membrane filter tank body. The pulley block is suspended on the crossbeam of the bearing frame. The lifting mechanism adopts a driving mechanism to be connected with two groups of filter screens in a driving manner by adopting a pulling rope assembly to pass through the pulley block. The two groups of anti-swing guide rails are respectively arranged on corresponding positions of two ends of hanging beams of the two groups of filter screens.

[0072] A treatment process of the submerged lifting cycling bio-membrane filter tank is as follows: two groups of filter screens which have equal weight and are symmetrically and alternately distributed are adopted. Under the action of the lifting mechanism, the two groups of filter screens rise and fall periodically in the bio-membrane filter tank, so that bio-membranes on the two groups of filter screens contact the air and sewage in turn. The bio-membranes absorb organic matters in the sewage when descending and submerging, and absorb oxygen when rising in the air so as to bring the oxygen into the sewage during the next descending and submerging and to cause the turbulence of the sewage in a water channel, so that the dissolved oxygen is uniformly distributed, and the sewage is purified.

[0073] Referring to FIG. 5-FIG. 8 showing the structural diagrams of embodiments 1 and 2 of a fibrous filter tank of the present invention, as shown in FIG. 5 and FIG. 6, embodiment 1 is a reciprocating lifting back-suction fibrous filter tank. As shown in FIG. 7 and FIG. 8, embodiment 2 is a reciprocating horizontal back-suction fibrous filter tank. The specific structure is as follows: the two reciprocating back-suction fibrous filter tanks each includes a sewage tank, a filtrate tank, a filter plate, a sludge sucker and a driving mechanism; and the sewage tank is connected with the filtrate tank. The junction between the sewage tank and the filtrate tank is provided with filter holes. The filter plate is fixedly installed on the filter holes. One side of the sewage tank of the filter plate is correspondingly provided with the sludge sucker, and the sludge sucker is close to the filter plate. The sludge sucker is connected with the driving mechanism and driven by the driving mechanism to make up-down or horizontal synchronous motion in opposite directions to suck the sludge.

[0074] The reciprocating lifting back-suction fibrous filter tanks are shown in FIG. 5 and FIG. 6. The driving mechanism of the reciprocating lifting back-suction fibrous filter tank includes a lifting mechanism. The bottom of the sewage tank is provided with a slope. A settled sludge pump is arranged in the sewage tank, and the inlet end of a sludge suction pipe of the settled sludge pump is arranged on the bottom of the sewage tank. The lifting mechanism includes a bearing frame, a lifting driving apparatus, a pulley and a pulling rope. The bearing frame is a portal structure, and two ends of the bearing frame are respectively installed and fixed on tank bodies at two sides of the sewage tank. The lifting driving apparatus is installed on a center position of a crossbeam of the bearing frame. The lifting driving apparatus is connected with the pulling rope, and two ends of the pulling rope respectively pass through the two pulleys to be connected with the two groups of sludge suckers. The pulling rope is driven by the driving lifting mechanism to pull the two groups of sludge suckers to make synchronous up-down motion in opposite directions one above the other.

[0075] The sludge sucker in FIG. 5 and FIG. 6 includes a sludge suction pump, a sludge suction head, a sludge suction pipe and sludge suction nozzles. The sludge suction pump is connected and communicated with the sludge suction head through the sludge suction pipe. A plurality of sludge suction nozzles are uniformly distributed at one side of the sludge suction head close to filter cloth. The sludge suction nozzles are close to the filter cloth, and the sludge suction range thereof covers the filter cloth. A highest position of the sludge suction head is equal to or slightly higher than the upper edge of the filter plate, and a lowest position of the sludge suction nozzle is equal to or slightly lower than the lower edge of the filter plate. Two ends of the sludge suction head of the sludge sucker are provided with a lifting guide roller, and correspondingly two ends of the sludge suction nozzle of the sewage tank are provided with a vertical lifting guide rail. The lifting guide rollers on two ends of the sludge suction head are sleeved in the lifting guide rails. The upper portion of the sewage tank is provided with a liquid level sensor. The upper portion of the lifting guide rail is provided with a limiting sensor limiting a travel distance of the sludge sucker.

[0076] The reciprocating lifting back-suction fibrous filter tank is shown in FIG. 7 and FIG. 8. Its driving mechanism includes a horizontal driving mechanism. The horizontal driving mechanism includes a transition power, a pulley block and a pulling rope. The transition power is installed and fixed at one side of the sewage tank. The pulley block is fixed on the wall of the sewage tank. The pulling rope bypasses the transition power. Two ends of the pulling rope pass through each pulley of the pulley block respectively to be connected with two horizontal ends of the sludge sucker group. The pulling rope is driven by the transition power to drive the sludge sucker group to make horizontal reciprocating motion.

[0077] The end of the sludge suction head of the sludge sucker in FIG. 7 and FIG. 8 is provided with the transition guide roller, and correspondingly the upper and lower horizontal portions of the sewage tank are respectively provided with a transition guide rail. The transition guide rollers on two ends of the sludge suction head are sleeved in the transition guide rails. The upper part of the sewage tank is provided with a liquid level sensor. The end portion of the transition guide rail is provided with a limiting sensor limiting the travel distance of the sludge sucker.

[0078] The front end of the sewage tank of the two fibrous filter tanks is connected with a water inlet groove, the rear end of the filtrate tank is connected with a water outlet channel, and an effluent weir is arranged between the filtrate tank and the water outlet channel. The liquid level of the filter tank is lower than the liquid level of the sewage tank, and the upper edge of the filter hole is located below the liquid level of the filtrate tank. The filter plate includes filter cloth and a filter cloth support, and the filter cloth is fixed on the filter cloth support.

[0079] A sewage treatment method of the two fibrous filter tanks are as follows: filter holes are symmetrically arranged between the sewage tank and the filtrate tank. The filter plate is fixedly installed on the filter holes. Sewage in the sewage tank is filtered by the filter plate to enter the filtrate tank. One side of the sewage tank of the filter plate is provided with the sludge sucker. The sludge sucker makes up-down or horizontal synchronous motion in opposite directions to suck the sludge under the action of the driving mechanism. When the filter plate is blocked, the liquid level of the sewage in the sewage tank rises. When the liquid level of the sewage in the sewage tank reaches the liquid level set by the liquid sensor, the sludge sucker is controlled and started to back suck the sludge on the filter plate. At the same time, the driving mechanism is started to drive the sludge sucker to make up-down or horizontal synchronous motion in opposite directions to suck away the sludge on the filter plate, so that the filter plate can restore the filter capacity.