High-concentration organic wastewater treatment reactor

Abstract

The present invention discloses a high-concentration organic wastewater treatment reactor. A lower water distribution system, an upper water distribution system, a lower three-phase separator and an upper inclined plate separator are provided from bottom to top in a reactor body of the high-concentration organic wastewater treatment reactor. A gas-liquid separator is disposed on the top of the reactor body. The lower water distribution system and the upper water distribution system are connected to an influent pipe. A lower biogas ascending pipe connected to the gas-liquid separator is disposed on the top of the lower three-phase separator. An upper biogas ascending pipe and an effluent pipe are disposed above the upper inclined plate separator. An outlet end of the upper biogas ascending pipe is connected to the gas-liquid separator. A downcomer is disposed on the bottom of the gas-liquid separator. An air pipe is disposed on the top of the gas-liquid separator. The reactor of the present invention has the characteristics of low energy consumption, good effluent water quality, large biogas production, and no odor, is capable of enhancing the even water distribution and fully mixing sludge and water, have a high removal efficiency of pollutants. Moreover, an internal circulating water dilutes influent water. A system having a strong impact resistance ability and a reactor being operated stably for a long term are achieved.

Claims

1. A high-concentration organic wastewater treatment reactor, comprising a reactor body, wherein, a lower water distribution system, an upper water distribution system, a lower three-phase separator and an upper inclined plate separator are provided from bottom to top in the reactor body, a gas-liquid separator is disposed on the top of the reactor body, the lower water distribution system and the upper water distribution system are both connected to an influent pipe, a lower biogas ascending pipe connected to the gas-liquid separator is disposed on the top of the lower three-phase separator, an upper biogas ascending pipe and an effluent pipe are disposed above the upper inclined plate separator, an outlet end of the upper biogas ascending pipe is connected to the gas-liquid separator, a high-load reaction zone is formed between the lower water distribution system and the lower three-phase separator, a low-load reaction zone is formed between the lower three-phase separator and the upper inclined plate separator, a downcomer extending into the high-load reaction zone is disposed on the bottom of the gas-liquid separator, an air pipe is disposed on the top of the gas-liquid separator, wherein the high-concentration organic wastewater treatment reactor comprises organic wastewater having COD concentration ranging from 3,000 to 6,000 mg/L, the high-load reaction zone is a reaction zone in a lower position in which organic ranges from 15 to 30 kg COD/m.sup.3.Math.d, and the low-load reaction zone is a reaction zone in the lower position in which the organic bad ranges from 0 to 1 kg COD/m.sup.3.Math.d.

2. The high-concentration organic wastewater treatment reactor according to claim 1, wherein a cyclone separator is connected to an outlet end of the effluent pipe, so as to further carry out sludge-water separation.

3. The high-concentration organic wastewater treatment reactor according to claim 1, wherein the lower water distribution system comprises a lower water distribution pipe and a water distribution hood, the lower water distribution pipe is located below the water distribution hood, the lower water distribution pipe is provided with effluent holes, the organic wastewater entering into the lower water distribution pipe is sprayed out through the effluent holes, and forms an ascending swirl after passing through the water distribution hood.

4. The high-concentration organic wastewater treatment reactor according to claim 1, wherein the upper water distribution system comprises: an upper water distribution main pipe surrounding the outside of the reactor body; and a plurality of water distribution branch pipes, each of which has one end connected to the upper water distribution main pipe and another end extending into the reactor body and connected to a nozzle, a plurality of nozzles are sprayed in a tangential direction of a same concentric circle.

5. The high-concentration organic wastewater treatment reactor according to claim 4, wherein four water distribution branch pipes are provided and evenly arranged, the plurality of nozzles connected to the water distribution branch pipes are arranged in a horizontal direction.

6. The high-concentration organic wastewater treatment reactor according to claim 1, wherein the reactor body is a full sealed reactor.

7. The high-concentration organic wastewater treatment reactor according to claim 1, wherein the lower water distribution system and the upper water distribution system are made of stainless-steel material, and both are mounted on the reactor body by a support frame; the lower three-phase separator and the upper inclined plate separator are both made of PP plate material.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a structural schematic view of a high-concentration organic wastewater treatment reactor according to the present invention.

(2) FIG. 2 is a cross-section view at line A-A in FIG. 1.

(3) In figures, 1—influent pipe, 2—lower water distribution pipe, 3—water distribution hood, 4—upper water distribution branch pipe, 5—upper water distribution main pipe, 6—nozzle, 7—lower three-phase separator, 8—downcomer, 9—lower biogas ascending pipe, 10—upper inclined plate separator, 11—gas-liquid separator, 12—cyclone separator, 13—upper biogas ascending pipe, 14—air pipe, 15—effluent pipe, 16—reactor body.

DETAILED DESCRIPTION OF THE EMBODIMENTS

(4) In order to be able to understand the technical solution of the present invention more clearly, the technical solution of the present invention will be further described in a non-limiting manner in conjunction with the accompanying drawings and specific embodiments.

(5) As shown in FIG. 1, a high-concentration organic wastewater treatment reactor of the present invention includes a reactor body 16 in which a lower water distribution system, an upper water distribution system, a lower three-phase separator 7 and an upper inclined plate separator 10 are provided from bottom to top. A gas-liquid separator 11 is disposed on the top of the reactor body 16. The lower water distribution system includes a lower water distribution pipe 2 and a water distribution hood 3. The lower water distribution pipe 2 is located below the water distribution hood 3. The lower water distribution pipe 2 is evenly provided with a plurality of effluent holes, the lower water distribution pipe 2 is connected to an influent pipe 1, and thus the wastewater entering into the lower water distribution pipe 2 is sprayed out through the effluent holes, and may form an ascending swirl after passing through the water distribution hood 2. The upper water distribution system includes: an upper water distribution main pipe 5 surrounding the outside of the reactor body 16; and a plurality of water distribution branch pipes 4, each of which has one end connected to the upper water distribution main pipe 5 and another end extending into the reactor body 16 and connected to a nozzle 6. A plurality of nozzles 6 are all sprayed in the tangential direction of the same concentric circle. The upper water distribution main pipe 5 is connected to the influent pipe 1. A lower biogas ascending pipe 9 connected to the gas-liquid separator 11 is disposed on the top of the lower three-phase separator 7. An upper biogas ascending pipe 13 and an effluent pipe 15 are disposed above the upper inclined plate separator 10. An outlet end of the upper biogas ascending pipe 13 is connected to the gas-liquid separator 11. A high-load reaction zone is formed between the lower water distribution system and the lower three-phase separator 7. A low-load reaction zone is formed between the lower three-phase separator 7 and the upper inclined plate separator 10. A downcomer 8 extending into the high-load reaction zone is disposed on the bottom of the gas-liquid separator 11. An air pipe 14 is disposed on the top of the gas-liquid separator 11.

(6) In order to further carry out sludge-water separation, a cyclone separator 12 is connected to an outlet end of the effluent pipe 15.

(7) Preferably, four water distribution branch pipes 4 are employed in this example and are evenly arranged. The plurality of nozzles 6 connected to the water distribution branch pipes 4 are arranged in a horizontal direction.

(8) The reactor body employed by the present invention has a full sealed design, which can realize the effect of no odor being discharged.

(9) The lower water distribution system and the upper water distribution system as described by the present invention are both made of stainless-steel material, and are both mounted on the reactor body by a support frame. The lower three-phase separator 7 and the upper inclined plate separator 10 are both made of PP plate material.

(10) The operating process of the high-concentration organic wastewater treatment reactor of the present invention is as follows:

(11) The wastewater enters into the lower water distribution pipe 2 of the lower water distribution system and the upper water distribution main pipe 5 of the upper water distribution system through the influent pipe 1. The wastewater is sprayed out from a plurality of water distribution holes provided on the lower water distribution pipe 2 after entering into the reactor through the lower water distribution pipe 2, forms an ascending swirl after passing through the water distribution hood 3, and is initially mixed with the anaerobic sludge. At the same time, part of the wastewater enters into the reactor through the water distribution branch pipes 4 after entering into the upper water distribution main pipe 5, and is sprayed into the reactor through the nozzles 6. Four nozzles are provided and are horizontally sprayed in the tangential direction of the same concentric circle. The water distribution method may increase the internal swirl, make the wastewater and sludge fully mixed, increase the mass transfer effect, and efficiently remove organic matters.

(12) In the high-load reaction zone, 50% to 70% of the organic matters in the wastewater are removed. The wastewater treated in the high-load reaction zone ascends into the lower three-phase separator 7 for sludge-water separation, and then the sludge returns to the high-load reaction zone, the wastewater enters into the low-load reaction zone for further treating, and 20% to 30% of the organic matters are removed in this area. Then, the wastewater is separated into sludge and water by passing through the upper inclined plate separator 10, and then the sludge returns to the low-load reaction zone, the treated wastewater is discharged from the effluent pipe 15 located above the upper inclined plate separator 10, enters into the cyclone separator 12 under the action of gravity, and is discharged after a further sludge-water separation. The biogas produced in the high-load zone is collected by the lower three-phase separator 7 and is introduced into the gas-liquid separator 11 through the lower biogas ascending pipe 9. The biogases produced in the low-load reaction zone is introduced into the gas-liquid separator 11 by passing through the upper biogas ascending pipe 13. Therefore, the biogas produced in the low-load reaction zone and the biogas produced in the high-load reaction zone are mixed in the gas-liquid separator 11. The wastewater carried by the biogas ascending into the gas-liquid separator 11 is separated from the biogas in the gas-liquid separator 11, and then passes through the downcomer 8 to return to the top of the water distribution hood 3 and mix with the influent water. The reflux water plays a diluent effect on the influent water, greatly enhancing the ability to resist impact load and the ability to anti-toxicity of the system. The separated biogas is discharged from the air pipe 14 on the top of the gas-liquid separator 11. The top of the reactor is full sealed, and thus no odor is discharged to the surrounding environment.

(13) The lower water distribution system and the upper water distribution system adopted in the present invention are both provided with control valves, flow meters and check valves, which can control the flow of the upper and lower water distribution systems.

(14) The high-concentration organic wastewater treatment reactor of the present invention has the advantages of: 1) adopting a two-tier water distribution system to fully mix sludge and wastewater, increasing the mass transfer effect, and having a good removal effect; 2) enhancing the internal circulation, having high ability to resist impact load and high volume load; 3) transforming organic pollutants into biogas and reusing the resource; 4) having no odor and being environmentally friendly due to the sealed the reactor.

(15) The following is relevant data generated by applying the high-concentration organic wastewater treatment reactor of the present invention in treating mixed wastewater produced by 1200 m.sup.3/d (70% wastepaper pulp, 30% chemimechanical pulp) pulp pulping and papermaking production line in early 2019 at a paper mill in Binyang County, Nanning, Guangxi:

(16) TABLE-US-00001 Index Influent COD Effluent COD Removal rate Time (mg/L) (mg/L) (%) January 20 3192 1156 0.64 January 21 3231 1287 0.60 January 22 3029 1012 0.67 January 23 2957 938 0.68 January 24 3478 1149 0.67 January 25 3170 988 0.69 January 26 3055 1092 0.64

(17) The above table shows the extracted operating data for seven days. It can be seen from the table that when the influent COD of the reactor of the present invention is about 3000 mg/L, the effluent water is about 1000 mg/L, the removal rate of pollutants is stable above 60%, and thus the treatment effect is better. Although the influent water has some fluctuations, but the effluent water is not affected by the fluctuations of the influent water.

(18) It can be seen that the high-concentration organic wastewater treatment reactor of the present invention has a high removal efficiency of pollutants, the system has a strong impact resistance ability, and can be operated stably for a long term.

(19) It should be noted that the above described preferred embodiments are only for illustrating the technical conceptions and features of the present invention, and the protection scope of the invention cannot be limited thereby. Any equivalent changes or modifications made according to the spiritual essence of the invention shall fall into the protection scope of the invention.