Preparation and application of in-situ high efficient degradation carbon based materials of VOCs in landfill based on waste recycling

Abstract

The invention discloses a preparation method and application of in-situ high-efficiency degradation carbon based material of VOCs in landfill based on waste regeneration, which comprises the following steps: air drying the agricultural and forestry wastes to a moisture content of 0.001 wt %˜20 wt %, and the agricultural and forestry wastes mainly include: straw, wheat straw, leaves, branches, weeds, crushing them to a particle size of 0-50 mm with a grinder, and then using urea or amide as modifier The nitrogen enriched biochar was prepared by mixing the crushed agricultural and forestry wastes with a mass ratio of 1:50-1:10; the nitrogen enriched biochar was prepared by retorting the nitrogen doped agricultural and forestry wastes at 300-600° C. for 20-60 min, and then cooling them rapidly; the nitrogen enriched biochar was mixed with the sewage sludge with a moisture content of 90-98 wt. % with a weight ratio of 20:1-10:1 to get the nitrogen enriched microorganism The degradation efficiency of TVOCs in landfill is 96.74%˜99.70%.

Claims

1. A preparation method of in-situ efficiency degradation carbon based material of VOCs in landfill based on waste regeneration, which is characterized in that the following steps are included: S01: pretreatment of raw materials: air dry the agricultural and forestry wastes to a moisture content of 0.001 wt %˜20 wt %, and crush them to a particle size of 0˜50 mm with a grinder, Then mix the organic nitrogen as a modifier with the crushed agricultural and forestry wastes in a mass ratio of 1:50˜1:10 to uniformly prepare the agricultural and forestry wastes mixed with nitrogen; S02: after 20-60 minutes of dry distillation at 300-600° C., the nitrogen doped agricultural and forestry wastes prepared in step S01 were rapidly cooled to prepare nitrogen rich biochar; S03: preparation of microbial rich nitrogen biochar: the microbial rich nitrogen biochar was prepared by mixing the nitrogen rich biochar obtained in step S02 and sewage sludge with water content of 90-98 wt. % in the proportion of 20:1-10:1 by weight; and S04: in situ degradation of VOCs in landfill site by microbial rich N-rich biochar: replace part of clay cover with microbial rich N-rich biochar obtained in step S03.

2. The preparation method as claimed in claim 1, which is characterized in that the agricultural and forestry wastes are selected from the group consisting of straw, wheat straw, bagasse, leaves, branches and weeds.

3. The preparation method according to claim 1, which is characterized in that the organic nitrogen modifier in step S01 is urea or amide.

4. The preparation method according to claim 1, which is characterized in that the sewage sludge in the step S03 is the activated sludge rich in microorganisms produced in the process of urban domestic sewage or industrial sewage treatment.

5. The preparation method according to claim 1, which is characterized in that the activated sludge contains microorganisms are selected from the group consisting of non methane nutrition bacteria, methane nutrition bacteria-i, methane nutrition bacteria-ii, aerobic heterotrophic bacteria, actinomycetes, fungi, sulfur oxidizing bacteria, and sulfate reducing bacteria.

6. The preparation method as claimed in claim 1, which is characterized in that the nitrogen mixed agricultural and forestry wastes in step S04 are uniformly prepared by mixing the organic nitrogen as modifier and the crushed agricultural and forestry wastes in the proportion of 1:50-1:10 by mass.

7. The preparation method as claimed in claim 1, which is characterized in that the nitrogen rich biochar rich in microorganism in step S04 replaces the clay covering layer.

Description

DESCRIPTION OF DRAWINGS

(1) FIG. 1 is a step diagram of the implementation process of the invention;

(2) FIG. 2 is a schematic diagram of the structure of the VOCs new field sealing cover of the in-situ degradation landfill of the invention;

(3) FIG. 3 is the microscopic diagram of biochar obtained in embodiment 6 when the magnification is 1 μm by scanning electron microscope;

(4) FIG. 4 is the microscopic diagram of the nitrogen-doped modified biochar obtained in embodiment 3 when the magnification is 1 μm by scanning electron microscope;

(5) FIG. 5 is a spectrum obtained by XPS n1s spectrum analysis of materials prepared in embodiment 6, embodiment 5, embodiment 3, embodiment 1 and embodiment 2;

(6) FIG. 6 is the spectrum obtained from infrared spectrum analysis of the materials prepared in embodiments 1 to 6;

(7) FIG. 7 is the histogram of adsorption capacity of embodiment 1-6 and clay for VOCs simulation gas;

(8) FIG. 8 is the structural diagram of the test device for the adsorption capacity test described in FIG. 7;

(9) FIG. 9 is the structure diagram of the test device for the VOCs degradation effect test of embodiments 1-6 and clay loaded microorganism;

(10) FIG. 10 is the TVOC degradation effect diagram of VOCs degradation by materials and clays of embodiment 9;

(11) FIG. 11 shows the cvoc degradation effect of the material and clay of embodiment 9 on VOCs degradation;

(12) FIG. 12 is an ovoc degradation effect diagram of VOCs degradation by materials and clays of embodiment 9;

(13) FIG. 13 is an effect diagram of SVOC degradation of VOCs by materials and clays of embodiment 9;

(14) FIG. 14 is an AVOC degradation effect diagram of VOCs degradation by materials and clays of embodiment 9;

(15) FIG. 15 is the degradation effect diagram of material and clay of embodiment 9 on NH.sub.3 degradation;

(16) FIG. 16 is the degradation effect diagram of material and clay of embodiment 9 on H.sub.2S degradation.

SPECIFIC IMPLEMENTATION MODE

(17) The invention will be further described in combination with the embodiments, but it will not be taken as the basis for limiting the invention.

Embodiment 1

(18) Take the agricultural and forestry wastes such as straw, wheat straw, leaves, branches, weeds and so on as an embodiment, 1000 g of agricultural and forestry wastes dried to 20 wt % of water content are crushed to 0-20 mm by a grinder, preferably 10-20 mm, and then 100 g of urea (5.0 wt % of n added) is evenly mixed with the crushed agricultural and forestry wastes, which are dried at 500° C. for 10-30 min, preferably 20-30 min, and then quickly wet Cool to room temperature to obtain 440 g of nitrogen rich biochar.

Embodiment 2

(19) Take the agricultural and forestry wastes such as straw, wheat straw, leaves, branches, weeds and so on as an embodiment, dry 1000 g of agricultural and forestry wastes whose weight is reduced to 20 wt % of water content, and crush them to 0-20 mm, preferably 10-20 mm, with a grinder, then mix 80 g of urea (4.0 wt % of N added) with the crushed agricultural and forestry wastes evenly, dry distillation at 500° C. for 10-30 min, preferably 20-30 min, and isolate the air Then the nitrogen rich biochar 430 g was obtained by wet cooling to normal temperature.

Embodiment 3

(20) Taking straw, wheat straw, leaves, branches, weeds and other agricultural and forestry wastes as an embodiment, 1000 g of agricultural and forestry wastes dried to 20 wt % water content are crushed to 0-20 mm by a grinder, preferably 10-20 mm, and then 60 g of urea (3.0 wt % of N added) is mixed with the crushed agricultural and forestry wastes evenly, dried at 500° C. for 30 min, and then rapidly cooled to normal temperature by wet method Nitrogen rich biochar 400 g.

Embodiment 4

(21) Taking straw, wheat straw, leaves, branches, weeds and other agricultural and forestry wastes as embodiments, 1000 g of agricultural and forestry wastes dried to 20 wt % of water content were crushed to 0-20 mm by a grinder, preferably 10-20 mm, and then 40 g of urea (2.0 wt % of N added) was mixed evenly with the crushed agricultural and forestry wastes, which were dried at 500° C. for 30 min, then rapidly cooled to normal temperature by wet method Nitrogen rich biochar 420 g.

Embodiment 5

(22) Taking straw, wheat straw, leaves, branches, weeds and other agricultural and forestry wastes as an embodiment, 1000 g of agricultural and forestry wastes dried to 20 wt % water content are crushed to 0-20 mm by a grinder, preferably 10-20 mm, and then 20 g of urea (1.0 wt % of N added) is mixed with the crushed agricultural and forestry wastes evenly, dry distilled at 500° C. for 30 min, and then rapidly cooled to normal temperature by wet method Nitrogen rich biochar 420 g.

Embodiment 6

(23) Taking straw, wheat straw, leaves, branches, weeds and other agricultural and forestry wastes as an embodiment, 100 g of agricultural and forestry wastes dried to 20 wt % of water content were crushed to 0-20 mm by a grinder, preferably 10-20 mm, and then dried at 500° C. for 30 min, then rapidly cooled to room temperature by wet method to obtain 443 gg of nitrogen rich biochar.

(24) Bet, SEM, XPS, FTIR and element analyzer were used to characterize the pore structure, surface chemical properties and element analysis of the nitrogen rich biochar or biochar obtained from embodiment 1, 2, 3, 4, 5 and 6. The results are shown in Table 1. The effect of the amount of nitrogen doping agent on the specific surface area, pore structure and element composition of the carbon based coating material.

(25) TABLE-US-00001 TABLE 1 S.sub.BET.sup.a V.sub.0.sup.b N C H Embodiment N/wt % m.sup.2/g cm.sup.3/g wt % wt % wt % 6 0 32 0.023 0.81 83.16 1.74 5 1.0 851 0.442 0.82 87.00 0.97 4 2.0 927 0.479 1.76 83.26 1.27 3 3.0 974 0.574 1.98 83.59 1.18 2 4.0 924 0.531 1.98 83.02 1.16 1 5.0 945 0.487 1.99 84.19 1.12

(26) The biochar or nitrogen rich biochar obtained in embodiment 6 and embodiment 3 were observed by scanning electron microscope, as shown in FIG. 3 and FIG. 4, respectively, with magnification of 1 μM. after the modification of mixed urea, the mesopore size became larger and the distribution was more uniform, as shown in FIGS. 5a, 5b, 5C and 5D, respectively, for XPS n1s of the carbon based coating material prepared in embodiment 6, embodiment 5, embodiment 3, embodiment 1 and embodiment 2 Spectrum analysis results. As shown in FIG. 5C, in embodiment 3, n1s peak appears on the attachment of 398 ev and 400.1 ev and 402 ev. The surface of the carbon based coating material is successfully doped with nitrogen atoms. 398 ev is equivalent to pyridine structure nitrogen, i.e. pyridine nitrogen (n-6), 400.1 ev is equivalent to pyrrole/pyridinone structure nitrogen (N-5), 402 ev is equivalent to graphite type nitrogen (n-q). In embodiment 3, the amount of nitrogen doping on the surface of carbon based coating material is 1.98% of the mass fraction of carbon based coating material. FIG. 5 combined with FIG. 6, infrared spectrum analysis of carbon based coating material shows that the peak value of nitrogen-containing functional groups on the surface of carbon based coating material after nitrogen doping modification is more obvious, and the content of nitrogen-containing functional groups is significantly increased.

(27) As shown in FIG. 8, nitrogen rich biochar (embodiments 5-1) and traditional clay and biochar (embodiment 6) are filled into a glass reaction tube, and simulation gas containing VOCs is input into the reaction tube. The flow rate of simulation gas is 150 ml/min; the concentration of VOCs in the simulation gas is 400 mg/m3; the reaction tube is insulated at 30° C. As shown in FIG. 7, the results of VOCs adsorption capacity using nitrogen rich biochar (embodiments 5-1) and traditional clay and biochar (embodiment 6) show that the adsorption performance of the materials in embodiments 5-1 is significantly better than that of clay, and the adsorption performance of the materials in embodiment 3 is the best, and the adsorption capacity of typical VOCs is about 5 times that of traditional clay. When the mass ratio of organic nitrogen to agricultural and forestry wastes is 3.0˜5.0 wt %, the adsorption effect of biochar modified by nitrogen on VOCs is the best.

Embodiment 7

(28) Application of Carbon Based Coating Material in Embodiment 6

(29) Then 0.5 kg of sewage or sludge with water content of 90-98 wt. % was sprayed on 5 kg of biochar in embodiment 6 and cultured in greenhouse for 60 days. The quantity of microorganism contained in biochar is shown in Table 2.

(30) TABLE-US-00002 TABLE 2 In a gram of dry basis sample the number of bacterial colonies on the surface Number Training time (days) (log CFU g DW..sup.−1) 5 10 15 20 25 30 35 40 45 50 55 60 Non methane trophic 5.4 6.8 8.3 9.2 10.8 10.1 11.3 11.9 10.8 10.4 9.8 9.2 bacteria Methanogen-I 3.1 5.3 6.9 7.8 8.4 7.7 8.3 9.1 9.3 8.9 8.7 8.4 Methanogen-II 2.8 3.3 4.1 5.1 5.6 6.1 6.2 5.7 5.6 5.2 5.4 5.7 Aerobic heterotrophic 6.1 8.1 9.5 9.7 9.4 9.6 9.5 9.3 9.3 8.7 8.2 7.5 bacteria Actinomycetes 2.2 3.7 5.1 6.4 6.1 5.3 5.1 4.9 5.3 4.6 4.5 4.1 Fungus 3.8 4.7 5.3 6.3 6.1 6 5.8 5.3 4.9 5.2 4.7 4.6 Sulfur oxidizing 1.4 1.55 1.68 1.98 2.17 2.56 2.34 2.55 2.11 2.01 2.12 1.87 bacteria Sulfate reducing 1.34 1.67 1.98 2.34 2.89 2.56 2.11 2.34 2.56 2.05 1.9 2.05 bacteria

Embodiment 8

(31) Then 5 kg clay was taken and cultured in greenhouse for 60 days. See Table 3 for the number of microorganisms in the clay.

(32) TABLE-US-00003 TABLE 3 In a gram of dry basis sample the number of bacterial colonies on the surface Number Training time (days) (log CFU g DW..sup.−1) 5 10 15 20 25 30 35 40 45 50 55 60 Non methane trophic 7.6 8.1 8.3 8.1 8.5 8.6 7.8 7.5 7.1 6.9 6.1 6.4 bacteria Methanogen-I 5.2 5.8 6.3 6.1 6.6 6.2 5.4 5.1 5.1 5.3 5.4 5.1 Methanogen-II 4.6 4.4 4.3 4.5 4.1 3.9 3.8 3.9 4.2 4.4 4.1 4.03 Aerobic 5.2 5.7 6.2 6.9 7.3 7.2 7.1 6.4 6.1 5.6 5.8 5.1 heterotrophic bacteria Actinomycetes 3.2 3.7 3.6 4.1 4.3 3.8 3.5 3.2 3.7 3.5 3.4 3.2 Fungus 3.1 4.1 4.2 4.8 4.2 4.3 4.1 3.9 3.2 3.3 2.9 2.8 Sulfur oxidizing 3.12 3.3 3.11 3.25 3.1 2.98 2.56 2.44 2.11 1.98 1.56 1.58 bacteria Sulfate reducing 2.58 3.12 3.48 3.85 3.78 3.69 3.54 3.35 3.14 3.05 3.11 2.18 bacteria

Embodiment 9

(33) Application of Carbon Based Coating Material in Embodiment 1

(34) Then 0.5 kg of sewage or sludge with water content of 90-98 wt. % was sprayed on 5 kg of nitrogen rich biochar in embodiment 1 and cultured in greenhouse for 60 days. See Table 4 for the number of microorganisms in the nitrogen doped modified biochar.

(35) TABLE-US-00004 TABLE 4 In a gram of dry basis sample the number of bacterial colonies on the surface Number Training time (days) (log CFU g DW..sup.−1) 5 10 15 20 25 30 35 40 45 50 55 60 Non methane trophic 11.3 11.9 12.4 13.1 13.5 12.7 13.8 12.1 10.9 11.5 11.9 11.2 bacteria Methanogen-I 7.1 7.3 8.5 8.8 9.1 8.6 9.4 10.1 9.3 9.1 8.9 8.6 Methanogen-II 6.7 7.3 8.1 8.8 9.6 8.5 8.1 7.6 6.5 6.3 5.9 6.4 Aerobic heterotrophic 8.9 9.1 10.4 10.7 11.5 12.6 13.5 12.3 11.8 10.3 9.6 9.8 bacteria Actinomycetes 5.3 5.7 6.3 6.9 6.4 5.9 5.8 5.7 5.7 5.2 5.1 4.9 Fungus 4.7 5.3 5.9 6.8 6.4 6.5 6.1 5.9 5.4 4.9 4.5 4.4 Sulfur oxidizing bacteria 2.34 2.55 2.78 2.87 2.67 2.67 2.43 2.2 2.34 2.11 2.23 2.03 Sulfate reducing 2.67 2.89 3.11 3.43 4.13 4.54 3.98 3.54 3.01 2.53 2.16 2.11 bacteria

(36) It can be seen from table 4, table 2 and table 3 that the use of nitrogen modified biochar loaded microorganisms can significantly promote bacterial reproduction within 30 days at the initial stage of culture. After 30 days of culture, the number of bacteria decreased gradually because there was no external nutrition supplement.

Embodiment 10

(37) Application of Carbon Based Coating Material in Embodiment 3

(38) Then 0.5 kg of sewage or sludge with water content of 90-98 wt. % was sprayed on 5 kg of nitrogen rich biochar in embodiment 3 and cultured in greenhouse for 60 days.

Embodiment 11

(39) The in-situ biodegradation performance of VOCs in Embodiment 7 was studied. The materials, garbage and sand in Embodiment 7 were successively filled into the device in FIG. 9 from high to low. The material filling thickness in Embodiment 7 was 300 mm, the garbage density was 920 kg/m3, the water content was 32.64%; the clay density was 1830 kg/m3, the water content was 15.27%; the sand density was 1950 kg/m3, the water content was 2.14%, and the sand was covered in the bottom layer. The in-situ biodegradation of VOCs by the material of embodiment 7 was compared with the soil column test device as shown in FIG. 9. Four measuring points are set in the soil column to measure the temperature: measuring point 1 is the lowest measuring point; measuring point 2 is the place with a landfill depth of 100 mm; measuring point 3 is the place with a landfill depth of 200 mm; measuring point 4 is the place with a landfill depth of 300 mm (i.e. the surface of the overburden). The VOCs generated by landfill waste and the VOCs concentration after filtration of the material in Embodiment 7 are collected. After 60 days of test, TVOC (total VOC), cvoc (chlorine VOC), ovoc are analyzed See Table 5 for the filtered concentration results of (oxygen VOC), SVOC (sulfur VOC) and AVOC (aromatic VOC).

(40) TABLE-US-00005 TABLE 5 unit ppb Name Days 5 10 15 20 25 30 35 TVOCs Point 1 3658 8569 11582 15896 18650 19865 23512 Point 2 2862 6140 7130 9580 12202 12084 13621 Point 3 2031 3853 4179 6303 7235 7409 7537 Point 4 1256 2145 2698 2746 2235 1568 1350 CVOC Point 1 792 1979 3402 5266 5993 7030 5837 Point 2 680 1573 2267 3822 4300 4854 3479 Point 3 540 1024 1306 2313 2325 2412 1857 Point 4 310 580 880 750 721 630 626.5 OVOC Point 1 1895 2986 3598 4569 4125 3896 3568 Point 2 1460 2085 2245 2685 2810 2480 1920 Point 3 1195 1325 1545 1655 1580 1490 1210 Point 4 655 856 846 750 610 530 412 SVOC Point 1 74 116 168 198 277 325 330 Point 2 59 46.3 62.85 92.05 97.95 114.5 116.1 Point 3 46 21.39 29.07 30.75 33.46 34.93 51.67 Point 4 30 41 52 47 36 34 31 AVOC Point 1 1629 4502 7313 10543 12503 14337 13341 Point 2 1306 3591 5623 6530 7382 8274 7942 Point 3 1052 2491 3627 3708 4691 3818 4852 Point 4 602 1456 2144 1322 855 750 606 Name Days 40 45 50 55 60 TVOCs Point 1 20561 16845 13589 11251 10510 Point 2 12018 11206 9520 8018 7109 Point 3 6451 6159 5967 4879 3829 Point 4 1250 1100 955 689 542 CVOC Point 1 5643 4125 4147 4049 3922 Point 2 3223 2608 2571 2282 2430 Point 3 1621 1317 1288 1291 1255 Point 4 536.5 315.5 312 295 212 OVOC Point 1 3215 2896 2158 1850 1740 Point 2 2084 1855 1540 1190 1060 Point 3 1295 1195 950 630 560 Point 4 354 229 195 148 124 SVOC Point 1 286 245 236 211 189 Point 2 99.91 77.06 74.78 66.39 61.61 Point 3 45.65 37.86 34.34 21.73 24.83 Point 4 25 21 20 19 18 AVOC Point 1 11958 9126 8450 8773 8506 Point 2 6694 6499 5007 5636 4783 Point 3 3762 3571 2849 2439 2382 Point 4 598 610 540 535 420

(41) The degradation efficiency results of embodiment 7 (biochar loaded microorganism without nitrogen modification) of TVOC (total VOC), cvoc (VOC with chlorine), ovoc (VOC with oxygen), SVOC (VOC with sulfur) and AVOC (VOC with aromatics) on the above VOCs are shown in Table 6.

(42) TABLE-US-00006 TABLE 6 % Days Name Material 5 10 15 20 25 30 35 40 45 50 55 60 TVOC Embodiment 7 65.66 74.97 76.71 82.73 88.02 92.11 94.26 93.92 93.47 92.97 93.88 94.84 CVOC Embodiment 7 60.86 70.69 74.13 85.76 87.97 91.04 89.27 90.49 92.35 92.48 92.71 94.59 OVOC Embodiment 7 65.44 71.33 76.49 83.59 85.21 86.4 88.45 88.99 92.09 90.96 92 92.87 SVOC Embodiment 7 59.46 64.66 69.05 76.26 87 89.54 90.61 91.26 91.43 91.53 91 90.48 AVOC Embodiment 7 63.04 67.66 70.68 87.46 93.16 94.77 95.46 95 93.32 93.61 93.9 95.06

(43) Analyze the VOCs concentration after filtering by the material of embodiment 10 or the traditional clay of embodiment 8. Conduct the test for 60 days. Analyze the degradation rates of TVOC (total VOC), cvoc (chlorine VOC), ovoc (oxygen VOC), SVOC (sulfur VOC), AVOC (aromatic VOC), NH2 and H2S by the material of embodiment 10 or the traditional clay of embodiment 8, as shown in Table 7. Embodiment 10 shows the biochar loaded microorganism mixed with 3.0 wt % nitrogen.

(44) TABLE-US-00007 TABLE 7 unit % Days Materials loaded with Name microorganisms 5 10 15 20 25 30 35 40 45 50 55 60 TVOC Embodiment 10 100 100 99.83 99.72 99.38 99.37 99.34 99.32 99.44 99.55 99.6 99.64 Clay 61.9 64.86 66.9 69.38 67.89 66.24 67.02 68.62 64.34 66.76 67.1 67.56 CVOC Embodiment 10 100 100 100 100 99.65 99.57 99.55 99.35 99.62 99.71 99.77 99.69 Clay 68.08 65.43 61.31 65.19 60.21 56.38 60.63 68.04 62.48 65.68 64.94 66.13 OVOC Embodiment 10 100 100 100 100 100 100 100 100 100 100 100 100 Clay 66.88 74.68 75.93 76.8 79.04 77.14 77.26 76.3 66.8 64.01 60.9 56.25 SVOC Embodiment 10 100 100 97.78 98.37 98.49 98.3 98.43 98.28 98.29 98.42 98.33 97.46 Clay 46.06 51.98 55.35 58.5 64.98 58.82 67.01 65.73 66.38 62.19 59.95 60.48 AVOC Embodiment 10 100 100 99.91 99.7 99.32 99.32 99.21 99.34 99.34 99.53 99.6 99.74 Clay 60.49 59.23 63.41 68.01 64.39 63.55 63.94 67.3 63.39 68.34 69.63 70.5 NH.sub.3 Embodiment 10 96.62 96.95 96.56 95.55 95.23 93.37 94.08 95.1 94.95 95.69 95.66 95.4 Clay 69.13 36.86 41.8 52.01 43.75 53.65 44.69 53.36 48.4 55.49 48.36 53.24 H.sub.2S Embodiment 10 96.87 97.33 96.84 97.5 97.2 97.38 97.82 97.14 98.02 97.56 96.09 96.51 Clay 60.24 59.5 56.99 67.75 68.59 66.44 71.02 71.31 73.38 74.32 69.61 74.7

(45) The results of table 6 and table 7 show that the degradation rate of biochar loaded with nitrogen is significantly higher than that of biochar loaded with nitrogen and clay loaded with microorganism, especially in the early stage (within 30 days) of in-situ degradation of VOCs in landfill site by the above materials, mainly because the biochar modified with nitrogen can significantly promote the propagation and expansion of microorganisms decomposing VOCs In particular, in the early stage of loading microorganisms, the speed of microbial amplification of biochar modified with nitrogen is very fast, and its effect is much better than that of biochar modified without nitrogen. The reason is that the biochar modified with nitrogen has polarity, large specific surface area, and can absorb VOCs to provide nutrition for the loaded microorganisms.

Embodiment 12

(46) As shown in FIG. 10-16, the results show that the degradation efficiency of the materials in embodiment 9 for TVOC, cvoc, ovoc, SVOC, AVOC, NH3 and H2S are 99.6%, 99.74%, 100%, 98.51%, 99.58%, 95.42% and 97.18%, respectively, while the degradation efficiency of clay for TVOC, cvoc, ovoc, SVOC, AVOC, NH3 and H2S are 66.54%, 66.70%, 70.90%, 59.78%, 65.18%, 50.06% and 67.82%, respectively. It can be seen that the material of embodiment 9 has good degradation effect on VOCs and inorganic odor. TVOC represents the total VOCs; cvoc represents the VOC containing chlorine; ovoc represents the VOC containing oxygen; SVOC represents the VOC containing sulfur; AVOC represents the VOC containing aromatics.