A process for treating desulfurization sludge leachate

Abstract

The present application relates to the technical field of wastewater treatment, and specifically discloses a treatment process for desulfurization sludge leaching wastewater. The treatment process for desulfurization sludge leaching wastewater uses a porous biological carbon core loaded with a composite bacterial solution as a wastewater treatment agent. The composite bacterial solution includes Burkholderia glumae, Actinomyces viscosus, Bacillus cereus, and Trichoderma harzianum in a live bacterial quantity ratio of 2-3:1.5-2.5:1.5-3:1.5-3.5. The present application uses the wastewater treatment agent in combination with a chemical precipitation method to achieve efficient degradation of desulfurization sludge leaching wastewater, and the resulting solid precipitate can be reused. The present application effectively solves the problem of the lack of technology for treating desulfurization sludge leaching wastewater in the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wastewater treatment, and particularly discloses a desulfurization sludge leaching wastewater treatment process. BACKGROUND

[0002] The limestone-gypsum wet flue gas desulfurization technology in a coal-fired power plant is the most commonly used flue gas desulfurization technology at present, and its main desulfurization process is as follows: when the flue gas of the coal-fired power plant flows through the desulfurization tower, the flue gas is fully mixed and contacted with the limestone slurry in countercurrent from bottom to top, and the sulfur dioxide and heavy metal pollutants in the flue gas are absorbed, and the limestone slurry is recycled. The advantages of the wet flue gas desulfurization technology are low cost, stable desulfurization effect, and by-product desulfurization gypsum can be resourceized to produce natural gypsum, further saving cost. However, the disadvantages of the wet flue gas desulfurization technology are also obvious, that is, the technology produces a large amount of desulfurization wastewater, the desulfurization wastewater has complex composition and various pollutants, and the water quality is weakly acidic, mainly containing suspended solids, salt (fluoride, chloride, sulfate), heavy metal ions (mainly including mercury, lead, cadmium, chromium, nickel, zinc, copper, arsenic and selenium), and the like, and has strong corrosiveness and fouling property, and must be treated before being discharged.

[0003] At present, the desulfurization wastewater is mainly converted into desulfurization sludge by using the chemical precipitation method, and a large amount of heavy metal ions and suspended solids are deposited in the desulfurization sludge, which needs to be treated before being discharged. However, the desulfurization sludge is a substance with high salt content and high heavy metal content, and the treatment cost is high, and the treatment of solid waste is more complex, which brings great pressure to the green society. In the prior art, the desulfurization sludge is mainly converted into a resourceized substance by using the chemical leaching method. However, the heavy metal ions in the waste liquid generated by leaching the desulfurization sludge still do not meet the discharge requirements, but there is no corresponding treatment technology to treat the waste liquid, which has caused a certain threat to the environmental safety for a long time. Therefore, it has great practical significance to develop a simple desulfurization sludge leaching wastewater treatment method to alleviate the environmental pressure. SUMMARY

[0004] In view of the problem of lacking a method for treating desulfurization sludge leaching wastewater in the prior art, the present application provides a desulfurization sludge leaching wastewater treatment process. The present application uses a porous biological carbon core loaded with a composite bacterial solution to prepare a brand-new wastewater treatment agent, and uses the wastewater treatment agent combined with the chemical precipitation method to achieve the purpose of efficiently degrading the desulfurization sludge leaching wastewater, and the obtained solid precipitate can be resourceized and reused.

[0005] To achieve the above-mentioned application purposes, the present application provides the following technical solutions.

[0006] The first aspect of the present application provides a treatment process of desulfurization sludge leaching wastewater, the treatment process comprising the following steps: step one, adding a precipitant to the desulfurization sludge leaching wastewater, performing a first precipitation, filtering, and obtaining a first filtered water;

[0007] Step two, adding a wastewater treatment agent to the first filtered water, adjusting the pH value of the wastewater to 6-8, filtering, and obtaining a second filtered water;

[0008] Step three, adjusting the pH value of the second filtered water to 7-8, adding a precipitant, performing a second precipitation, filtering, and obtaining the treated wastewater.

[0009] The wastewater treatment agent comprises a porous biological carbon core and a composite bacterial solution loaded on the porous biological carbon core, and the composite bacterial solution comprises Burkholderia cenocepacia, Actinomyces viscosus, Bacillus cereus, and Trichoderma harzianum in a live bacteria quantity ratio of 2-3:1.5-2.5:1.5-3:1.5-3.5.

[0010] Compared with the prior art, the treatment process of the desulfurization sludge leaching wastewater is more simple, a new wastewater treatment agent is prepared by using the porous biological carbon core loaded with the composite bacterial solution, and the purpose of efficiently degrading the desulfurization sludge leaching wastewater is achieved by using the wastewater treatment agent combined with the chemical precipitation method. The composite bacterial solution comprises Burkholderia cenocepacia, Actinomyces viscosus, Bacillus cereus, and Trichoderma harzianum, and the present application uses multiple bacterial agents to passivate and adsorb the heavy metals in the desulfurization sludge leaching wastewater, so as to reduce the toxicity in the water body. The porous biological carbon core can be used as an organic carbon source for the microbial bacterial agent to adsorb the heavy metals, so as to achieve the purpose of efficiently adsorbing the heavy metals in the wastewater. Meanwhile, the porous channels in the porous biological carbon core can also be used as carriers for the biological bacterial agent to adsorb the heavy metals, so as to reduce the content of the heavy metals in the wastewater.

[0011] The present application performs a second precipitation on the filtered water after the wastewater treatment agent treatment, further removes the heavy metal ions in the water, and the obtained precipitate is mainly metal precipitate, which can be recycled and reused, avoiding the problem that the sludge generated by the desulfurization sludge leaching wastewater in the traditional treatment method needs to be treated again. The present application uses the porous biological carbon core loaded with the composite bacterial solution to achieve the purpose of efficiently degrading the heavy metals in the desulfurization sludge leaching wastewater, and the operation is simple and the cost is low, effectively solving the problem of the lack of treatment of the desulfurization sludge leaching wastewater in the prior art.

[0012] Preferably, the preparation method of the porous biological carbon core comprises the following steps:

[0013] S1, under an inert atmosphere, crushing the seaweed residue and performing a pre-carbonization treatment to obtain a first carbonized substance;

[0014] S2, mixing the first carbide with metal carbonate, ball milling, sintering at 900-1000℃, grinding, to obtain the porous bio-carbon core.

[0015] Further preferably, in S1, the temperature of the pre-carbonization treatment is 250-280℃, and the holding time of the pre-carbonization treatment is 3-5h.

[0016] Further preferably, in S1, the pre-carbonization treatment is performed in a programmed temperature raising manner, and the temperature raising rate of the pre-carbonization treatment is 4-6℃ / min.

[0017] Further preferably, in S2, the metal carbonate is any one of potassium carbonate or sodium carbonate.

[0018] Further preferably, in S2, the rotation speed of the ball milling is 300-500rpm, and the time of the ball milling is 1-2h.

[0019] Further preferably, in S2, the mass ratio of the first carbide to the metal carbonate is 1:1-1.5.

[0020] Further preferably, in S2, the time of the sintering is 3-5h.

[0021] Further preferably, in S2, the sintering is performed in a programmed temperature raising manner, and the temperature raising rate of the sintering is 8-12℃ / min.

[0022] Further preferably, in S2, the time of the grinding is 20-40min.

[0023] Preferably, the total viable bacteria number of the composite bacteria solution is (1-6)×10 9 CFU / mL.

[0024] Preferably, the preservation number of the Burkholderia cepacia is NCTC10743.

[0025] Preferably, the preservation number of the Actinomyces naeslundii is ATCC43146.

[0026] Preferably, the preservation number of the Bacillus cereus is CICC21261.

[0027] Preferably, the preservation number of the Trichoderma harzianum is BNCC336568.

[0028] Preferably, the preparation method of the wastewater treatment agent comprises the following steps: dipping the porous bio-carbon core into the expanded culture composite bacteria solution, filtering, drying, to obtain the desulfurization sludge leaching wastewater treatment agent.

[0029] Further preferably, the mass-volume ratio of the porous biological carbon core to the composite bacterial solution is 1g:(1.5-2)mL.

[0030] Preferably, in step one and step three, the precipitant used in the first precipitation and the second precipitation is sodium hydroxide.

[0031] Further preferably, in step one, the mass ratio of the desulfurization sludge leaching wastewater to the precipitant is 10:1-1.5.

[0032] Preferably, in step three, the mass ratio of the second filtration water to the precipitant is 10:0.5-1.

[0033] Preferably, in step two, the mass ratio of the first filtration water to the wastewater treatment agent is 5-10:0.05-0.1.

[0034] In summary, the present application provides a desulfurization sludge leaching wastewater treatment process, which uses a porous biological carbon core loaded with a composite bacterial solution to prepare a new wastewater treatment agent. The wastewater treatment agent is combined with a chemical precipitation method to achieve efficient degradation of desulfurization sludge leaching wastewater, and the obtained solid precipitate can be recycled. The present application effectively solves the problem of the lack of technology for treating desulfurization sludge leaching wastewater in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 The figure shows the detection results of heavy metal content in the wastewater obtained from each example and each comparative example. DETAILED DESCRIPTION

[0036] The technical solutions in the examples of the present application will be described clearly and completely below. Obviously, the described examples are only a part of the examples of the present application, not all examples. Based on the examples in the present application, all other examples obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0037] The onion Burkholderia, Actinomyces viscosus, Bacillus cereus and Trichoderma harzianum used in the present application are activated in LB medium respectively, and activated at 35℃ for 2 days to obtain activated onion Burkholderia, activated Actinomyces viscosus, activated Bacillus cereus and activated Trichoderma harzianum.

[0038] The formula of the LB solid culture medium is: 10g of proteose peptone, 5g of yeast extract powder, 10g of NaCl, 20g of agar and 1L of distilled water; the pH is 7.0, and the sterilization is performed at 121℃ for 20min.

[0039] The activated Burkholderia cenocepacia, activated Actinomyces viscosus, activated Bacillus cereus and activated Trichoderma harzianum are inoculated into seed culture medium respectively, and are cultured at 35℃ and 150rpm for 24h to obtain Burkholderia cenocepacia seed liquid, Actinomyces viscosus seed liquid, Bacillus cereus seed liquid and Trichoderma harzianum seed liquid respectively;

[0040] The formula of the seed culture medium is 3% hydrolyzed sugar, 3% corn steep liquor, 0.4% urea, 0.2% K2HPO4, 0.05% MgSO4 and the rest is distilled water, and the pH of the seed culture medium is 7.0;

[0041] The prepared Burkholderia cenocepacia seed liquid, Actinomyces viscosus seed liquid, Bacillus cereus seed liquid and Trichoderma harzianum seed liquid are inoculated into fermentation culture medium respectively at 5% volume percentage, and are fermented at 35℃ and 50% dissolved oxygen for 32h to obtain Burkholderia cenocepacia liquid with a cell concentration of 3.2×10 9 CFU / mL, Actinomyces viscosus liquid with a cell concentration of 4.6×10 9 CFU / mL, Bacillus cereus liquid with a cell concentration of 2.9×10 9 CFU / mL and Trichoderma harzianum liquid with a cell concentration of 5.3×10 9 CFU / mL respectively.

[0042] The formula of the fermentation culture medium is 10g protein Chen, 5g beef powder, 4g yeast powder, 2g glucose, 1ml Tween 80, 2g potassium phosphate dibasic, 5g sodium acetate, 2g triammonium citrate, 0.2g magnesium sulfate, 0.05g manganese sulfate, 15g agar powder and 1000ml distilled water, and the pH is 6.0, and the sterilization is carried out at 121℃ for 15min.

[0043] Example 1

[0044] The embodiment provides a treatment process for leaching wastewater of desulfurization sludge, and specifically comprises the following contents.

[0045] Step one, under an inert atmosphere, 200g of seaweed residue is crushed into a powder with a size of 0.5mm-1mm, and then heated to 260℃ at a heating rate of 5℃ / min for pre-carbonization treatment, and kept for 4h to obtain a first carbonized product;

[0046] Step two, the first carbonized product is mixed with 250g of potassium carbonate, ball milled at a speed of 400rpm for 1.5h, and then heated to 950℃ at a heating rate of 10℃ / min for sintering for 4h, and then ground for 30min to obtain 420g of the porous biochar core;

[0047] Step three, mix the porous biochar core with 600 mL of the composite bacteria solution, shake at 38°C for 2h, filter, and dry at 35°C to obtain the desulfurization sludge leaching wastewater treatment agent;

[0048] Step four, add 6 kg of sodium hydroxide to 50 L of desulfurization sludge leaching wastewater, mix uniformly, stand for 20 min, filter to obtain the first filtration product water;

[0049] Step five, add 500 g of wastewater treatment agent to the first filtration product water, adjust the pH value of the wastewater to 6, filter to obtain the second filtration product water;

[0050] Step six, adjust the pH value of the second filtration product water to 7.2, add 4.8 kg of sodium hydroxide, filter to obtain the treated wastewater.

[0051] The total number of viable bacteria in the composite bacteria solution is 5.7x10 9 CFU / mL, wherein the viable bacteria quantity ratio of Burkholderia cepacia bacteria solution, Actinomyces naeslundii bacteria solution, Bacillus cereus bacteria solution, and Trichoderma harzianum bacteria solution is 2.5:2:2.5:3.

[0052] Example 2

[0053] The present embodiment provides a desulfurization sludge leaching wastewater treatment process, which specifically includes the following contents.

[0054] Step one, under an inert atmosphere, 200 g of seaweed residue is crushed into a powder of 0.5-1 mm, then heated to 270°C at a heating rate of 6°C / min for pre-carbonization treatment, and kept for 3h to obtain a first carbonized product;

[0055] Step two, mix the first carbonized product with 250 g of potassium carbonate, ball mill at a speed of 350 rpm for 2h, then sinter at a heating rate of 10°C / min to 1000°C for 3h, and grind for 30 min to obtain 416 g of the porous biochar core;

[0056] Step three, mix the porous biochar core with 700 mL of the composite bacteria solution, shake at 38°C for 2h, filter, and dry at 35°C to obtain the desulfurization sludge leaching wastewater treatment agent;

[0057] Step four, add 6 kg of sodium hydroxide to 50 L of desulfurization sludge leaching wastewater, mix uniformly, stand for 20 min, filter to obtain the first filtration product water;

[0058] Step five, add 500 g of wastewater treatment agent to the first filtration product water, adjust the pH value of the wastewater to 6, filter to obtain the second filtration product water;

[0059] Step six, adjusting the pH value of the secondary filtration water to 7.4, adding a precipitant, filtering, and obtaining the treated wastewater.

[0060] The total number of viable bacteria in the composite bacterial solution is 4.8*10 9 CFU / mL, and the ratio of the number of viable bacteria in the Burkholderia cepacia solution, Actinomyces naeslundii solution, Bacillus cereus solution, and Trichoderma harzianum solution is 3:1.5:3:2.5.

[0061] Example 3

[0062] The embodiment provides a desulfurization sludge leaching wastewater treatment process, and specifically comprises the following contents.

[0063] Step one, under an inert atmosphere, 200g of seaweed residue is crushed into a powder of 0.5mm-1mm, and then pre-carbonized at a temperature rising rate of 4℃ / min to 280℃, and kept for 3h, to obtain a first carbonized product;

[0064] Step two, the first carbonized product is mixed with 250g of sodium carbonate, ball milled at a speed of 500rpm for 1h, and then sintered at a temperature rising rate of 12℃ / min to 960℃ for 5h, and ground for 30min, to obtain 408g of the porous bio-carbon core;

[0065] Step three, the porous bio-carbon core is mixed with 800mL of the composite bacterial solution, shaken at 38℃ for 2h, filtered, and dried at 35℃, to obtain the desulfurization sludge leaching wastewater treatment agent;

[0066] Step four, 6kg of sodium hydroxide is added to 50L of desulfurization sludge leaching wastewater, mixed uniformly, and kept for 20min, filtered, to obtain primary filtration water;

[0067] Step five, 500g of the wastewater treatment agent is added to the primary filtration water, the pH value of the wastewater is adjusted to 6, and filtered, to obtain secondary filtration water;

[0068] Step six, the pH value of the secondary filtration water is adjusted to 5.3, 5kg of a precipitant is added, and filtered, to obtain treated wastewater.

[0069] The total number of viable bacteria in the composite bacterial solution is 4.8*10 9 CFU / mL, and the ratio of the number of viable bacteria in the Burkholderia cepacia solution, Actinomyces naeslundii solution, Bacillus cereus solution, and Trichoderma harzianum solution is 3:1.5:3:2.5.

[0070] Comparative example 1

[0071] The comparative example provides a desulfurization sludge leaching wastewater treatment agent, which is different from example 1 in that the composite bacterial agent is lactic acid bacteria, Actinomyces viscosus, Bacillus cereus and Trichoderma harzianum, the culture method and culture medium of each bacterial liquid remain unchanged, and other preparation processes remain unchanged, and specifically includes the following contents.

[0072] Step one, after 200g of seaweed residue is crushed into a powder of 0.5mm-1mm, pre-carbonization treatment is performed at a temperature increasing rate of 5℃ / min to 260℃, and the temperature is kept for 4h, to obtain a first carbonide;

[0073] Step two, the first carbonide is mixed with 250g of potassium carbonate, ball milled at a speed of 400rpm for 1.5h, and then sintered at a temperature increasing rate of 10℃ / min to 950℃ for 4h, and ground for 30min, to obtain 420g of the porous biochar core;

[0074] Step three, the porous biochar core is mixed with 600mL of the composite bacterial liquid, shaken at 38℃ for 2h, filtered, and dried at 35℃ to obtain the desulfurization sludge leaching wastewater treatment agent;

[0075] Step four, 6kg of sodium hydroxide is added to 50L of desulfurization sludge leaching wastewater, mixed uniformly, left to stand for 20min, filtered, to obtain the first filtration product water;

[0076] Step five, 500g of wastewater treatment agent is added to the first filtration product water, the pH value of the wastewater is adjusted to 6, and filtered, to obtain the second filtration product water;

[0077] Step six, the pH value of the second filtration product water is adjusted to 7.2, 4.8kg of sodium hydroxide is added, and filtered, to obtain the treated wastewater.

[0078] The total number of viable bacteria in the composite bacterial liquid is 3.9x10 9 CFU / mL, wherein the number of viable bacteria in the lactic acid bacteria liquid, Actinomyces viscosus liquid, Bacillus cereus liquid and Trichoderma harzianum liquid is 2.5:2:2.5:3.

[0079] Comparative example 2

[0080] The comparative example provides a desulfurization sludge leaching wastewater treatment agent, which is different from example 1 in that the composite bacterial agent is lactic acid bacteria, Actinomyces viscosus, Bacillus cereus and Trichoderma harzianum, the culture method and culture medium of each bacterial liquid remain unchanged, and other preparation processes remain unchanged, and specifically includes the following contents.

[0081] Step one, under inert atmosphere, 200g of seaweed residue was crushed into a powder of 0.5-1mm, then pre-carbonized at a temperature of 260℃ with a temperature increasing rate of 5℃ / min, and kept for 4h, to obtain a first carbonized product;

[0082] Step two, the first carbonized product was mixed with 250g of potassium carbonate, ball-milled at a speed of 400rpm for 1.5h, then sintered at a temperature of 950℃ with a temperature increasing rate of 10℃ / min for 4h, and ground for 30min, to obtain 420g of the porous bio-carbon core;

[0083] Step three, the porous bio-carbon core was mixed with 600mL of the composite bacteria solution, shaken at 38℃ for 2h, filtered, and dried at 35℃, to obtain the desulfurization sludge leaching wastewater treatment agent;

[0084] Step four, 6kg of sodium hydroxide was added into 50L of desulfurization sludge leaching wastewater, mixed evenly, and stood for 20min, then filtered to obtain the first filtration product water;

[0085] Step five, 500g of the wastewater treatment agent was added into the first filtration product water, to adjust the pH value of the wastewater to 6, then filtered to obtain the second filtration product water;

[0086] Step six, the pH value of the second filtration product water was adjusted to 7.2, 4.8kg of sodium hydroxide was added, and filtered to obtain the treated wastewater.

[0087] The total number of viable bacteria in the composite bacteria solution is 5.7x10 9 CFU / mL, and the viable bacteria quantity ratio of the Burkholderia cepacia bacteria solution, Actinomyces naeslundii bacteria solution, yeast bacteria solution, and Trichoderma harzianum bacteria solution is 2.5:2:2.5:3.

[0088] Comparative Example 3

[0089] This comparative example provides a desulfurization sludge leaching wastewater treatment agent, which is different from Example 1 in that the composite bacteria agent is lactic acid bacteria, Actinomyces naeslundii, Bacillus cereus, and Pseudomonas putida, the culture method and culture medium of each bacteria solution remain unchanged, and other preparation processes remain unchanged, and specifically includes the following contents.

[0090] Step one, under inert atmosphere, 200g of seaweed residue was crushed into a powder of 0.5-1mm, then pre-carbonized at a temperature of 260℃ with a temperature increasing rate of 5℃ / min, and kept for 4h, to obtain a first carbonized product;

[0091] Step two, the first carbonized product was mixed with 250g of potassium carbonate, ball-milled at a speed of 400rpm for 1.5h, then sintered at a temperature of 950℃ with a temperature increasing rate of 10℃ / min for 4h, and ground for 30min, to obtain 420g of the porous bio-carbon core;

[0092] Step three, mix the porous biochar core with 600 mL of the composite bacteria solution, shake uniformly at 38°C, keep for 2h, filter, dry at 35°C, get the desulfurization sludge leaching wastewater treatment agent;

[0093] Step four, add 6 kg of sodium hydroxide to 50 L of desulfurization sludge leaching wastewater, mix uniformly, stand for 20 min, filter, get the first filtration product water;

[0094] Step five, add 500 g of wastewater treatment agent to the first filtration product water, adjust the pH value of the wastewater to 6, filter, get the second filtration product water;

[0095] Step six, adjust the pH value of the second filtration product water to 7.2, add 4.8 kg of sodium hydroxide, filter, get the treated wastewater.

[0096] Among them, the total number of viable bacteria in the composite bacteria solution is 5.7 x 10 9 CFU / mL, wherein the viable bacteria quantity ratio of Burkholderia cepacia bacteria solution, Actinomyces viscosus bacteria solution, Bacillus cereus bacteria solution and Pseudomonas putida bacteria solution is 2.5:2:2.5:3.

[0097] Comparative Example 4

[0098] This comparative example provides a desulfurization sludge leaching wastewater treatment agent, which is different from Example 1 in that the composite bacteria agent is lactic acid bacteria, Actinomyces viscosus, yeast and Trichoderma harzianum, the culture method and culture medium of each bacteria solution remain unchanged, and other preparation processes remain unchanged, which specifically includes the following contents.

[0099] Step one, under an inert atmosphere, 200 g of seaweed residue is crushed into a powder of 0.5-1 mm, then heated to 260°C at a heating rate of 5°C / min for pre-carbonization treatment, and kept for 4h, to get the first carbonization product;

[0100] Step two, mix the first carbonization product with 250 g of potassium carbonate, ball mill at a speed of 400 rpm for 1.5h, then heat to 950°C at a heating rate of 10°C / min for 4h, and grind for 30 min, to get 420 g of the porous biochar core;

[0101] Step three, mix the porous biochar core with 600 mL of the composite bacteria solution, shake uniformly at 38°C, keep for 2h, filter, dry at 35°C, get the desulfurization sludge leaching wastewater treatment agent;

[0102] Step four, add 6 kg of sodium hydroxide to 50 L of desulfurization sludge leaching wastewater, mix uniformly, stand for 20 min, filter, get the first filtration product water;

[0103] Step five, 500 g of the wastewater treatment agent is added into the water produced by the first filtration, the pH value of the wastewater is adjusted to 6, and then filtration is performed to obtain water produced by the second filtration;

[0104] Step six, the pH value of the water produced by the second filtration is adjusted to 7.2, 4.8 kg of sodium hydroxide is added, and then filtration is performed to obtain the treated wastewater.

[0105] The total number of viable bacteria in the composite bacterial solution is 5.7 x 10 9 CFU / mL, wherein the viable bacteria quantity ratio of the lactic acid bacteria solution, the Actinomyces solution, the yeast solution and the Trichoderma harzianum solution is 2.5:2:2.5:3.

[0106] Comparative Example 5

[0107] This comparative example provides leachate wastewater treated with desulfurization sludge.

[0108] In order to further verify the technical effects of the present application, the content of heavy metal ions in the wastewater obtained in Examples 1-3 and Comparative Examples 1-5 is detected, and the specific detection results are shown in Table 1.

[0109] Table 1: Detection results of heavy metal ion content

[0110]

[0111]

[0112] The above only describes the preferred embodiments of the present application and should not be used to limit the present application, and any modification, equivalent replacement or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A process for the treatment of desulfurization sludge leachate wastewater, characterized in that: The treatment process comprises the following steps: Step one, adding a precipitant to the desulfurization sludge leachate to perform a first precipitation, filtering to obtain a first filtered water; Step two, adding a wastewater treatment agent to the first filtered water to adjust the pH value of the wastewater to 6-8, filtering to obtain a second filtered water; Step three, adjusting the pH value of the second filtered water to 7-8, adding a precipitant to perform a second precipitation, filtering to obtain the treated wastewater; The wastewater treatment agent comprises a porous biological carbon core and a composite bacterial solution loaded on the porous biological carbon core, and the composite bacterial solution comprises Burkholderia glumae, Actinomyces viscosus, Bacillus cereus, and Trichoderma harzianum in a live bacterial quantity ratio of 2-3:1.5-2.5:1.5-3:1.5-3.

5.

2. The treatment process of desulfurization sludge leachate waste according to claim 1, characterized by: The preparation method of the porous biological carbon core comprises the following steps: S1, under an inert atmosphere, crushing seaweed residue and performing a pre-carbonization treatment to obtain a first carbonized substance; S2, mixing the first carbonized substance with a metal carbonate, ball milling, sintering at 900-1000℃, and grinding to obtain the porous biological carbon core.

3. The treatment process of desulfurization sludge leachate waste according to claim 2, characterized by: In S1, the pre-carbonization treatment temperature is 250-280℃, and the pre-carbonization treatment holding time is 3-5h.

4. The treatment process of desulfurization sludge leachate waste according to claim 2, characterized by: In S1, the pre-carbonization treatment adopts a programmed temperature rising mode, and the pre-carbonization treatment temperature rising rate is 4-6℃ / min.

5. The process for treating desulfurization sludge leachate waste water as claimed in claim 2 wherein: In S2, the metal carbonate is any one of potassium carbonate or sodium carbonate; and / or In S2, the ball milling rotation speed is 300-500rpm, and the ball milling time is 1-2h.

6. The process for treating desulfurization sludge leachate waste water as claimed in claim 2 wherein: In S2, the mass ratio of the first carbonized substance to the metal carbonate is 1:1-1.5; and / or In S2, the sintering time is 3-5h; and / or In S2, the sintering adopts a programmed temperature rising mode, and the sintering temperature rising rate is 8-12℃ / min.

7. The process for treating desulfurization sludge leachate waste according to claim 1, characterized by: The total viable bacteria count of the complex bacteria solution is (1-6) x 10 9 CFU / mL.

8. The process for treating desulfurization sludge leachate waste according to claim 1, characterized by: The preservation number of the Burkholderia glumae is NCTC10743; and / or The preservation number of the Actinomyces viscosus is ATCC43146; and / or The preservation number of the Bacillus cereus is CICC21261; and / or The preservation number of the Trichoderma harzianum is BNCC336568.

9. The process for treating desulfurization sludge leachate waste according to claim 1, characterized by: The preparation method of the wastewater treatment agent comprises the following steps: immersing the porous biological carbon core in the expanded composite bacterial solution, filtering, and drying to obtain the desulfurization sludge leachate treatment agent.

10. The treatment process of desulfurization sludge leachate waste according to claim 9, characterized by: The mass-volume ratio of the porous biological carbon core to the composite bacterial solution is 1g:(1.5-2)mL.

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