CN114230115A - Efficient sludge conditioner and preparation method and application thereof - Google Patents

Efficient sludge conditioner and preparation method and application thereof Download PDF

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CN114230115A
CN114230115A CN202111620572.6A CN202111620572A CN114230115A CN 114230115 A CN114230115 A CN 114230115A CN 202111620572 A CN202111620572 A CN 202111620572A CN 114230115 A CN114230115 A CN 114230115A
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sludge
conditioner
filtrate
nitrogen
content
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曹露
黄海明
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Dongguan University of Technology
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/02—Biological treatment
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B25/00—Phosphorus; Compounds thereof
    • C01B25/16—Oxyacids of phosphorus; Salts thereof
    • C01B25/26—Phosphates
    • C01B25/45—Phosphates containing plural metal, or metal and ammonium
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • C02F1/5254—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using magnesium compounds and phosphoric acid for removing ammonia
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
    • C02F11/148—Combined use of inorganic and organic substances, being added in the same treatment step

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  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Water Supply & Treatment (AREA)
  • Environmental & Geological Engineering (AREA)
  • Hydrology & Water Resources (AREA)
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  • Health & Medical Sciences (AREA)
  • Molecular Biology (AREA)
  • Treatment Of Sludge (AREA)

Abstract

The invention relates to a high-efficiency sludge conditioner and a preparation method and application thereof. The high-efficiency sludge conditioner comprises protease, sodium hexametaphosphate and sodium dodecyl benzene sulfonate. The efficient sludge conditioner provided by the invention can realize the recovery of organic matters and nitrogen and phosphorus in the excess sludge and the resource recycling of the organic matters and the nitrogen and phosphorus in the excess sludge through the synergistic cooperation of the components, and has a wide application prospect.

Description

Efficient sludge conditioner and preparation method and application thereof
Technical Field
The invention belongs to the technical field of sludge treatment, and particularly relates to a high-efficiency sludge conditioner and a preparation method and application thereof.
Background
Phosphorus is an important element required in life activities of human beings, animals, plants and the like. There are studies showing that since the circulation of phosphorus resources in nature is unidirectional, phosphorus will face the problem of exhaustion in the next 100 years. In addition, with the progress of modern urbanization becoming faster and faster, sewage treatment plants are increasing, the treatment capacity of sewage is also increasing, and meanwhile, sludge byproducts generated by the sewage treatment plants are increasing, so that how to properly treat excess sludge becomes a hot topic. The residual sludge contains a large amount of heavy metals, organic pollutants and pathogenic microorganisms, and if the residual sludge is not properly treated, the environment is polluted; in addition, the sludge is rich in nitrogen and phosphorus, and if the sludge is not recycled, the potential risk of eutrophication caused by the surrounding water environment and the serious waste of phosphorus resources exist. Furthermore, it is common for the influent concentration of sewage treatment plants in southern regions to be low, and it is therefore of particular importance to find a source of carbon to supply to the sewage treatment plants.
The patent of the invention, which is named as a resource treatment process for continuously and rapidly discharging zero sewage of dewatered sludge in a sewage plant, discloses a scheme for treating sludge by using protein decomposing bacteria and a heavy metal complexing agent, but the scheme cannot utilize a phosphorus source in the sludge.
Therefore, it is necessary to provide a new process capable of properly treating excess sludge and recycling organic matters and nitrogen and phosphorus in the sludge.
Disclosure of Invention
The invention aims to overcome the defect or deficiency that phosphorus in excess sludge cannot be effectively recovered when sludge is treated in the prior art, and provides a high-efficiency sludge conditioner. The efficient sludge conditioner provided by the invention can realize the recovery of organic matters and nitrogen and phosphorus in the excess sludge and the resource recycling of the organic matters and the nitrogen and phosphorus in the excess sludge through the synergistic cooperation of the components, and has a wide application prospect.
The invention also aims to provide a preparation method of the sludge conditioner.
The invention also aims to provide the application of the sludge conditioner in sludge treatment.
The invention also aims to provide a method for sludge disintegration and nitrogen and phosphorus recovery.
In order to achieve the purpose, the invention adopts the following technical scheme:
the efficient sludge conditioner comprises the following components in parts by weight:
0.25-1 part of protease
0.5-1 part of sodium hexametaphosphate
0.5-1 part of sodium dodecyl benzene sulfonate.
According to the invention, the protease, the sodium hexametaphosphate and the sodium dodecyl benzene sulfonate are compounded, so that the obtained high-efficiency sludge conditioner can realize the recovery of organic matters and nitrogen and phosphorus in the excess sludge and the resource recycling of the excess sludge. Specifically, the method comprises the following steps: the protease can hydrolyze bacterial protein and polypeptide in the sludge, so that the sludge is broken; sodium hexametaphosphate can cause the interface properties of two phases (solid phase and liquid phase) in the sludge to be changed, thereby destroying extracellular polymers, releasing more bound water and substances, and being beneficial to subsequent recovery and resource recycling; in addition, the sodium dodecyl benzene sulfonate dissolves organic matters by the principle of similar intermiscibility, and a large amount of COD can be released by the dissolution of the organic matters and can be used as a carbon source for subsequent utilization.
According to the invention, a large amount of nitrogen, phosphorus and organic matters in the sludge can be thoroughly released through the synergistic cooperation of the protease, the sodium hexametaphosphate and the sodium dodecyl benzene sulfonate; and nitrogen, phosphorus and organic matters can be effectively recycled through subsequent filter pressing and precipitation treatment.
Proteases conventional in the art that can effect hydrolysis of bacterial proteins and polypeptides in sludge can be used in the present invention.
Preferably, the protease is an acid protease.
The preparation method of the high-efficiency sludge conditioner comprises the following steps: and mixing protease, sodium hexametaphosphate and sodium dodecyl benzene sulfonate to obtain the sludge conditioner.
A method for efficiently recovering organic matters, nitrogen and phosphorus in sludge comprises the following steps:
s1: pretreating sludge to destroy gel structure, cell structure, sludge floc and microorganism structure in the sludge;
s2: adding the high-efficiency sludge conditioner as claimed in any one of claims 1 to 3 into the pretreated sludge solution to obtain a conditioned sludge solution; the mass ratio of the pretreated sludge solution to the high-efficiency sludge conditioner is 1: 0.007-0.015;
s3: performing filter pressing on the conditioned sludge solution to obtain a filter cake and filtrate;
s4: adding magnesium salt into the filtrate under stirring, reacting, and filtering to obtain filter residue and treated filtrate.
The method provided by the invention can realize thorough disintegration of sludge and efficient recovery of nitrogen and phosphorus, and specifically comprises the following steps:
in S1, the gel structure, the cell structure, the sludge floc and the microorganism structure in the sludge can be destroyed by pretreating the sludge, so that the subsequent conditioning treatment is facilitated.
S2, the sludge conditioner is used for conditioning, so that sludge cells are broken, extracellular polymers are further destroyed, organic matters in the sludge are dissolved, and the release of the organic matters and nitrogen and phosphorus can be fully realized.
S3, performing pressure filtration to obtain a filter cake and a filtrate, wherein the filter cake can be used for landfill, land utilization, building material utilization, incineration, power generation, heating and the like, and the filtrate contains a large amount of organic matters and nitrogen phosphorus (HPO)4 2-、H2PO4 -、NH4 +) And is ready for further utilization.
S4, adding magnesium salt, organic matters and nitrogen and phosphorus in the filtrate, and recovering the nitrogen and phosphorus by forming magnesium ammonium phosphate crystals to leave a large amount of filtrate rich in the organic matters, which can provide nutrients for culturing microorganisms in sewage treatment. The specific process of the reaction is as follows:
Mg2++HPO4 2-+NH4 ++6H2O→MgNH4PO4·6H2O+H+
Mg2++H2PO4 -+NH4 ++6H2O→MgNH4PO4·6H2O+H+
through the conditioning of the specific high-efficiency sludge conditioner and the cooperation with other treatment steps, the high-efficiency treatment of the sludge can be realized, and meanwhile, nitrogen, phosphorus and organic matters in the sludge are recovered and recycled. In addition, the method is simple and easy to implement, the raw materials are easy to obtain, the cost is low, and the method can be widely applied to actual work.
Preferably, the preprocessing in S1 includes: and adding an acidic substance into the sludge, and adjusting the pH value to 3-6.
More preferably, the acidic substance is a sulfuric acid solution, a nitric acid solution, or a mixture thereof.
Preferably, the concentration of the protease in the conditioned sludge of S2 is 1.0-5.0 g/L, the concentration of the sodium hexametaphosphate is 0.2-0.5 mmol/gSS, and the concentration of the sodium dodecyl benzene sulfonate is 0.2-0.5 mmol/gSS.
Preferably, the temperature of the conditioning in S2 is 30-50 ℃.
Preferably, the conditioning of S2 further comprises a stirring step, wherein the stirring speed is 150-200 r/min.
Preferably, the mass ratio of the filtrate in S4 (the filtrate refers to the filtrate before adding magnesium salt) to the magnesium salt is 1: 0.001-0.003.
Preferably, the magnesium salt is one or more of magnesium chloride, magnesium sulfate or magnesium carbonate.
Compared with the prior art, the invention has the following beneficial effects:
the efficient sludge conditioner provided by the invention can realize the recovery of organic matters and nitrogen and phosphorus in the excess sludge and the resource recycling of the organic matters and the nitrogen and phosphorus in the excess sludge through the synergistic cooperation of the components, and has a wide application prospect.
Detailed Description
The present invention will be further described with reference to examples and comparative examples. These examples are merely representative descriptions of the present invention, but the present invention is not limited thereto. The test methods used in the following examples and comparative examples are, unless otherwise specified, conventional methods, and the raw materials, reagents and the like used are, unless otherwise specified, commercially available raw materials and reagents.
The sludge in each embodiment and comparative example of the invention is from a sludge concentration tank of an urban domestic sewage treatment plant.
Examples 1 to 6 and comparative examples 1 to 3
The present examples and comparative examples provide a series of sludge conditioners having the following formulation in table 1 and utilize the sludge conditioners for sludge treatment.
TABLE 1 formulas of sludge conditioners 1# -6 # provided in examples 1-6 and sludge conditioners 1# -3 # provided in comparative examples 1-3
Figure BDA0003437378370000041
Each sludge conditioner is prepared by the following steps: the components are uniformly mixed to obtain the sludge conditioner.
Application example 1
The sludge conditioner provided in example 1 is used for treating sludge, and the specific process is as follows:
(1) firstly, sludge is pretreated: acidolysis of sludge with H2SO4Adjusting the pH value to 3 to remove pathogenic bacteria in the sludge and destroy the structure of cells in the sludge, thereby providing a basis for subsequent treatment;
(2) adding 10g of sludge conditioner 1# into the pretreated sludge solution (1000mL), and carrying out the treatment at the temperature of 45 ℃, wherein the temperature is relatively adaptive to the acid protease, so that the protease has the best effect. The conditioner and the sludge can be mixed more uniformly under the action of a magnetic stirrer (200rpm), so that the reaction is more complete, the content of protease in the sludge is 2g/L, the content of sodium hexametaphosphate is 0.4mmol/gSS, and the content of sodium dodecyl benzene sulfonate is 0.4 mmol/gSS.
(3) And (3) performing filter pressing on the sludge conditioned in the step (2) to obtain a filter cake and a filtrate. Wherein the filter cake can be used for sludge landfill, sludge land utilization, sludge building material utilization, sludge incineration power generation and heating and the like; measuring ammonia nitrogen content and PO in filtrate4P content, test results are given in table 2; adding 12Mg of magnesium chloride into the filtrate (70mL) to provide a Mg source for forming magnesium ammonium phosphate crystals in the filtrate, and simultaneously adjusting the pH to be about 9.6, wherein the reaction equation is as follows:
Mg2++HPO4 2-+NH4 ++6H2O→MgNH4PO4·6H2O+H+
Mg2++H2PO4 -+NH4 ++6H2O→MgNH4PO4·6H2O+H+
(4) filtering the formed magnesium ammonium phosphate crystal, wherein the residual filtrate is rich in a large amount of organic matters and can be used for culturing microorganisms in a sludge treatment plant. The content of struvite in the recovered precipitate and the COD of the filtrate were measured, and the results are shown in Table 2.
Application example 2
The sludge conditioner provided in example 2 is used for treating sludge, and the specific process is as follows:
(1) firstly, sludge is pretreated: acidolysis of sludge with H2SO4The pH was adjusted to 3.
(2) Adding 10g of sludge conditioner 2# into the pretreated sludge solution (1000mL), and carrying out the treatment at the temperature of 45 ℃. The conditioner and the sludge can be mixed more uniformly through the action of a magnetic stirrer (200rpm), so that the reaction is more complete. At this time, the content of acidic protease in the sludge was 1.429g/L, the content of sodium hexametaphosphate was 0.429mmol/gSS, and the content of sodium dodecylbenzenesulfonate was 0.429 mmol/gSS.
(3) And (3) performing filter pressing on the sludge conditioned in the step (2) to obtain a filter cake and a filtrate. Wherein the filter cake can be used for sludge landfill, sludge land utilization, sludge building material utilization, sludge incineration power generation and heating and the like; measuring ammonia nitrogen content and PO in filtrate4P content, test results are given in table 2. The pH was adjusted to about 9.6 by adding 12mg of magnesium chloride to the filtrate (70 mL).
(4) Filtering the formed magnesium ammonium phosphate crystal, wherein the residual filtrate is rich in a large amount of organic matters and can be used for culturing microorganisms in a sludge treatment plant. The content of struvite in the recovered precipitate and the COD of the filtrate were measured, and the results are shown in Table 2.
Application example 3
The sludge conditioner provided in example 3 is used for treating sludge, and the specific process is as follows:
(1) firstly, sludge is pretreated: acidolysis of sludge with H2SO4The pH was adjusted to 3.
(2) Adding 10g of sludge conditioner 3# into the pretreated sludge solution (1000mL), and carrying out the treatment at the temperature of 45 ℃. The conditioner and the sludge can be mixed more uniformly through the action of a magnetic stirrer (200rpm), so that the reaction is more complete. At this time, the content of acid protease in the sludge is 1.111g/L, the content of sodium hexametaphosphate is 0.444mmol/gSS, and the content of sodium dodecyl benzene sulfonate is 0.444 mmol/gSS.
(3) And (3) performing filter pressing on the sludge conditioned in the step (2) to obtain a filter cake and a filtrate. Wherein the filter cake can be used for sludge landfill, sludge land utilization, sludge building material utilization, sludge incineration power generation and heating and the like; measuring ammonia nitrogen content and PO in filtrate4P content, test results are given in table 2. The pH was adjusted to about 9.6 by adding 12mg of magnesium chloride to the filtrate (70 mL).
(4) Filtering the formed magnesium ammonium phosphate crystal, wherein the residual filtrate is rich in a large amount of organic matters and can be used for culturing microorganisms in a sludge treatment plant. The content of struvite in the recovered precipitate and the COD of the filtrate were measured, and the results are shown in Table 2.
Application example 4
The sludge conditioner provided in example 3 is used for treating sludge, and the specific process is as follows:
(1) firstly, sludge is pretreated: acidolysis of sludge with H2SO4The pH was adjusted to 3.
(2) Adding sludge into the pretreated sludge solution (1000mL) to condition 4#10g, and performing at the temperature of 45 ℃, so that a conditioner and the sludge can be mixed more uniformly under the action of a magnetic stirrer (200rpm), and the reaction is more complete. At this time, the content of acid protease in the sludge is 2.941g/L, the content of sodium hexametaphosphate is 0.353mmol/gSS, and the content of sodium dodecyl benzene sulfonate is 0.353 mmol/gSS.
(3) And (3) performing filter pressing on the sludge conditioned in the step (2) to obtain a filter cake and a filtrate. Wherein the filter cake can be used for sludge landfill, sludge land utilization, sludge building material utilization, sludge incineration power generation and heating and the like; measuring ammonia nitrogen content and PO in filtrate4P content, test results are given in table 2. The pH was adjusted to about 9.6 by adding 12mg of magnesium chloride to the filtrate (70 mL).
(4) Filtering the formed magnesium ammonium phosphate crystal, wherein the residual filtrate is rich in a large amount of organic matters and can be used for culturing microorganisms in a sludge treatment plant. The content of struvite in the recovered precipitate and the COD of the filtrate were measured, and the results are shown in Table 2.
Application example 5
The sludge conditioner provided in example 5 was used to treat sludge, and the specific process was as follows:
(1) firstly, sludge is pretreated: acidolysis of sludge with H2SO4The pH was adjusted to 3.
(2) And (2) adding 10g of sludge conditioner 5# into the pretreated sludge solution (1000mL), and performing the treatment at the temperature of 45 ℃, so that the conditioner and the sludge can be mixed more uniformly under the action of a magnetic stirrer (200rpm), and the reaction is more complete. At this time, the content of acid protease in the sludge is 4g/L, the content of sodium hexametaphosphate is 0.3mmol/gSS, and the content of sodium dodecyl benzene sulfonate is 0.3 mmol/gSS.
(3) And (3) performing filter pressing on the sludge conditioned in the step (2) to obtain a filter cake and a filtrate. Wherein the filter cake can be used for sludge landfill, sludge land utilization, sludge building material utilization, sludge incineration power generation and heating and the like; measuring ammonia nitrogen content and PO in filtrate4P content, test results are given in table 2. The pH was adjusted to about 9.6 by adding 12mg of magnesium chloride to the filtrate (70 mL).
(4) Filtering the formed magnesium ammonium phosphate crystal, wherein the residual filtrate is rich in a large amount of organic matters and can be used for culturing microorganisms in a sludge treatment plant. The content of struvite in the recovered precipitate and the COD of the filtrate were measured, and the results are shown in Table 2.
Application example 6
The sludge conditioner provided in example 3 is used for treating sludge, and the specific process is as follows:
(1) firstly, sludge is pretreated: acidolysis of sludge with H2SO4The pH was adjusted to 3.
(2) Adding 10g of sludge conditioner 6# into the pretreated sludge solution (1000mL), and carrying out the treatment at the temperature of 45 ℃, so that the conditioner and the sludge can be mixed more uniformly under the action of a magnetic stirrer (200rpm), and the reaction is more complete. At this time, the content of acid protease in the sludge is 3.333g/L, the content of sodium hexametaphosphate is 0.333mmol/gSS, and the content of sodium dodecyl benzene sulfonate is 0.333 mmol/gSS.
(3) And (3) performing filter pressing on the sludge conditioned in the step (2) to obtain a filter cake and a filtrate. Wherein the filter cake can be used for sludge landfill, sludge land utilization, sludge building material utilization, sludge incineration power generation and heating and the like; measuring ammonia nitrogen content and PO in filtrate4P content, test results are given in table 2. The pH was adjusted to about 9.6 by adding 12mg of magnesium chloride to the filtrate (70 mL).
(4) Filtering the formed magnesium ammonium phosphate crystal, wherein the residual filtrate is rich in a large amount of organic matters and can be used for culturing microorganisms in a sludge treatment plant. The content of struvite in the recovered precipitate and the COD of the filtrate were measured, and the results are shown in Table 2.
Application example 7
The sludge conditioner provided in example 1 is used for treating sludge, and the specific process is as follows:
(1) firstly, sludge is pretreated: acidolysis of sludge with H2SO4The pH was adjusted to 3.
(2) Adding 7.0g of sludge conditioner 1# into the pretreated sludge solution (1000mL), and carrying out the treatment at the temperature of 45 ℃, wherein the temperature is relatively adaptive to the acid protease, so that the protease has the best effect. The conditioner and the sludge can be mixed more uniformly under the action of a magnetic stirrer (200rpm), so that the reaction is more complete, the content of protease in the sludge is 1.000g/L, the content of sodium hexametaphosphate is 2.000mmol/gSS, and the content of sodium dodecyl benzene sulfonate is 2.000 mmol/gSS.
(3) And (3) performing filter pressing on the sludge conditioned in the step (2) to obtain a filter cake and a filtrate. Wherein the filter cake can be used for sludge landfill, sludge land utilization, sludge building material utilization, sludge incineration power generation and heating and the like; measuring ammonia nitrogen content and PO in filtrate4P content, test results are given in table 2; the pH was adjusted to about 9.6 by adding 12mg of magnesium chloride to the filtrate (70 mL).
(4) Filtering the formed magnesium ammonium phosphate crystal, wherein the residual filtrate is rich in a large amount of organic matters and can be used for culturing microorganisms in a sludge treatment plant. The content of struvite in the recovered precipitate and the COD of the filtrate were measured, and the results are shown in Table 2.
Application example 8
The sludge conditioner provided in example 1 is used for treating sludge, and the specific process is as follows:
(1) firstly, sludge is pretreated: acidolysis of sludge with H2SO4The pH was adjusted to 3.
(2) Adding 15.0g of sludge conditioner 1# into the pretreated sludge solution (1000mL), and carrying out the treatment at the temperature of 45 ℃, wherein the temperature is relatively adaptive to the acid protease, so that the protease has the best effect. The conditioner and the sludge can be mixed more uniformly under the action of a magnetic stirrer (200rpm), so that the reaction is more complete, the content of protease in the sludge is 3.000g/L, the content of sodium hexametaphosphate is 6.000mmol/gSS, and the content of sodium dodecyl benzene sulfonate is 6.000 mmol/gSS.
(3) And (3) performing filter pressing on the sludge conditioned in the step (2) to obtain a filter cake and a filtrate. Wherein the filter cake can be used for sludge landfill, sludge land utilization, sludge building material utilization, sludge incineration power generation and heating and the like; measuring ammonia nitrogen content and PO in filtrate4P content, test results are given in table 2; the pH was adjusted to about 9.6 by adding 12mg of magnesium chloride to the filtrate (70 mL).
(4) Filtering the formed magnesium ammonium phosphate crystal, wherein the residual filtrate is rich in a large amount of organic matters and can be used for culturing microorganisms in a sludge treatment plant. The content of struvite in the recovered precipitate and the COD of the filtrate were measured, and the results are shown in Table 2.
Comparative application example 1
In the comparative example, the sludge is treated by using the sludge conditioner 1 provided in the comparative example 1, and the operation steps are the same as those of the application example 1 except that the sludge conditioner 1 is added in the step (2).
At this time, the content of protease in the sludge is 0g/L, the content of sodium hexametaphosphate is 0.5mmol/gSS, and the content of sodium dodecyl benzene sulfonate is 0.5 mmol/gSS.
The content of ammonia nitrogen and PO in the filter liquor after filter pressing4The P content, the struvite content in the recovered precipitate, and the COD of the filtrate are shown in Table 2.
Comparative application example 2
In the comparative example, the sludge is treated by the sludge conditioner 2 provided in the comparative example 2, and the operation steps are the same as those of the application example 1 except that the sludge conditioner 2 is added in the step (2).
At this time, the content of protease in the sludge is 5g/L, the content of sodium hexametaphosphate is 0mmol/gSS, and the content of sodium dodecyl benzene sulfonate is 0.5 mmol/gSS.
The content of ammonia nitrogen and PO in the filter liquor after filter pressing4The P content, the struvite content in the recovered precipitate, and the COD of the filtrate are shown in Table 2.
Comparative application example 3
In the comparative example, the sludge is treated by using the sludge conditioner 3 provided in the comparative example 3, and the operation steps are the same as those of the application example 1 except that the sludge conditioner 3 is added in the step (2).
At this time, the content of protease in the sludge is 5g/L, the content of sodium hexametaphosphate is 0.5mmol/gSS, and the content of sodium dodecyl benzene sulfonate is 0 mmol/gSS.
The content of ammonia nitrogen and PO in the filter liquor after filter pressing4The P content, the struvite content in the recovered precipitate, and the COD of the filtrate are shown in Table 2.
TABLE 2 measurement results
Figure BDA0003437378370000091
As can be seen from table 2, the high-efficiency sludge conditioner provided by this embodiment is used to condition sludge, and the other steps are simultaneously performed, so that the organic matters and nitrogen and phosphorus in the excess sludge can be efficiently recovered and recycled.
The sludge conditioner provided by the comparative example 1 is not added with protease, and can not hydrolyze protein and polypeptide structures of sludge cells, so that the content of ammonia nitrogen in filtrate is not high, and substances which can come out from sludge are correspondingly reduced. The sludge conditioner provided by the comparative example 2 does not add sodium hexametaphosphate, can not destroy extracellular polymers of the sludge, and can not release a large amount of substances, so that the ammonia nitrogen content and PO (phosphorus oxide) are increased4The P content, the COD value and the magnesium ammonium phosphate content are reduced. The sludge conditioner provided by the comparative example 3 is not added with sodium dodecyl benzene sulfonate, and can not dissolve organic matters released from the sludge, so that the COD content is greatly reduced.
Finally, it should be noted that the above embodiments are only representative examples of the present invention. Obviously, the technical solution of the present invention is not limited to the above-described embodiments, and many variations are possible. All modifications which can be derived or suggested by a person skilled in the art from the present disclosure are to be considered within the scope of the claims of the present invention.

Claims (10)

1. The efficient sludge conditioner is characterized by comprising the following components in parts by weight:
0.25-1 part of protease
0.5-1 part of sodium hexametaphosphate
0.5-1 part of sodium dodecyl benzene sulfonate.
2. The sludge conditioner of claim 1, wherein the protease is an acid protease.
3. The preparation method of the high-efficiency sludge conditioner as claimed in any one of claims 1 to 2, characterized by comprising the following steps: and mixing the protease, the sodium hexametaphosphate and the sodium dodecyl benzene sulfonate to obtain the high-efficiency sludge conditioner.
4. The use of the high-efficiency sludge conditioner as claimed in any one of claims 1-2 in sludge treatment.
5. A method for efficiently recovering organic matters, nitrogen and phosphorus in sludge is characterized by comprising the following steps:
s1: pretreating sludge to destroy gel structure, cell structure, sludge floc and microorganism structure in the sludge;
s2: adding the high-efficiency sludge conditioner as claimed in any one of claims 1-2 into the pretreated sludge solution to obtain a conditioned sludge solution; the mass ratio of the pretreated sludge solution to the high-efficiency sludge conditioner is 1: 0.007-0.015;
s3: performing filter pressing on the conditioned sludge solution to obtain a filter cake and filtrate;
s4: adding magnesium salt into the filtrate under stirring, reacting, and filtering to obtain filter residue and treated filtrate.
6. The method for sludge disintegration and nitrogen and phosphorus recovery as claimed in claim 5, wherein the pretreatment in S1 comprises: and adding an acidic substance into the sludge, and adjusting the pH value to 3-6.
7. The method for sludge disintegration and nitrogen and phosphorus recovery as claimed in claim 6, wherein the acidic substance is sulfuric acid solution, nitric acid solution or a mixture thereof.
8. The method for sludge disintegration and nitrogen and phosphorus recovery as claimed in claim 5, wherein the concentration of protease in the conditioned sludge of S2 is 1.0-5.0 g/L, the concentration of sodium hexametaphosphate is 0.2-0.5 mmol/gSS, and the concentration of sodium dodecylbenzenesulfonate is 0.2-0.5 mmol/gSS.
9. The method for sludge disintegration and nitrogen and phosphorus recovery as claimed in claim 5, wherein the mass ratio of the filtrate to the magnesium salt in S4 is 1: 0.001-0.003.
10. The method for sludge disintegration and nitrogen and phosphorus recovery as claimed in claim 5, wherein the magnesium salt in S4 is one or more of magnesium chloride, magnesium sulfate and magnesium carbonate.
CN202111620572.6A 2021-12-27 2021-12-27 Efficient sludge conditioner and preparation method and application thereof Pending CN114230115A (en)

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