CN104743760A - Method for synchronously implementing sludge strengthened dewatering and increasing bio-adsorbent yield - Google Patents
Method for synchronously implementing sludge strengthened dewatering and increasing bio-adsorbent yield Download PDFInfo
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- CN104743760A CN104743760A CN201510102421.XA CN201510102421A CN104743760A CN 104743760 A CN104743760 A CN 104743760A CN 201510102421 A CN201510102421 A CN 201510102421A CN 104743760 A CN104743760 A CN 104743760A
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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
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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
- C02F11/12—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
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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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
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/20—Sludge processing
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Abstract
The invention relates to a method for synchronously implementing sludge strengthened dewatering and increasing bio-adsorbent yield. The method comprises the following steps: getting surplus sludge from a municipal sewage treatment plant using a biotreatment process, according to the mass ratio of a surfactant to the sludge dry weight being (0.01-0.3):1, mixing uniformly, performing aerobic fermentation and cultivation, performing mechanical filter pressing on the fermented sludge, wherein the obtained sludge cake is a dewatered sludge and the filtrate is a liquid bio-adsorbent; and storing the filtrate in a fridge at the temperature of 0-5 DEG C for later use. By adopting the method, the sludge dewatering effect is strengthened, the bio-adsorbent production is increased, and the reduction and the reclamation of the surplus sludge are synchronously implemented. Compared with the aerobic fermentation process of the surplus sludge without adding the surfactant under the same condition, the method disclosed by the invention has the advantages that the yield of the bio-adsorbent is increased by 1.8-2.7 times and the moisture content of the sludge cake is reduced by 7.7-15.8%.
Description
Technical field
The present invention relates to a kind of method synchronously realizing mud strengthen dewatering and improve biological adsorption agent output, belong to environmental protection technical field.
Background technology
Along with the quickening of Urbanization in China, urban population continuing to increase in recent years, China is increasing for the treatment capacity of town sewage, causes the output of the by product ~ excess sludge produced in sewage treatment process constantly to increase." national environmental protection " 12 " planning " is pointed out: within 2015, our sewage treatment capacity is 47,500,000,000 tons; if by often processing ten thousand tons of sewage, to produce 7.5 tons of water ratio be 80% residual active sludge (mud cake after dehydration), and China can produce 3512.5 ten thousand tons of residual active sludges for 2015.The objectionable impuritiess such as the organic substance containing large quantity of moisture, kind complexity in excess sludge and various heavy toxic substance, pathogenic bacteria and viral micro-organisms, stack arbitrarily or landfill if do not add process to it, can cause severe contamination to environment.
But excess sludge is waste material and the environmental pollutant of sewage work's generation, is again good organic resource.The aggregate that the organism of the zoogloea that it is formed by multiple-microorganism and absorption thereof and inorganics form, wherein organic content is about 60%, biological easily degraded organic constituent is more than 40%, and these biological easily biodegradable organicses are the polymer such as protein, polysaccharide, nucleic acid mainly.The functional group comprised in these polymers can provide numerous adsorption site positions for adsorption process, therefore, can be used as the process of biological adsorption agent for heavy metal-containing waste water.This biological adsorption agent has the advantage that preparation is simple, energy-efficient and low-cost, clearance are high, be easy to be separated and reclaim heavy metal.Obviously, if excess sludge can be utilized to prepare biological adsorption agent, not only reduce its pollution to environment, production department can have the biological adsorption agent of efficient heavy absorption property again, so just achieve the minimizing of excess sludge, stabilization, resource utilization and reduce the object of environmental pollution.Chinese invention patent 201310234516.8 discloses the technique utilizing excess sludge to prepare Biosorbent for heavy metals, and specifically advanced person acts charitably aerobe fermentation then supersound process, last centrifugation.
Summary of the invention
The object of the present invention is to provide a kind of method synchronously realizing reinforcement sludge dehydration and improve biological adsorption agent output.Use method of the present invention, can not only reinforcement sludge dehydrating effect, can also yield of heavy metal bio-adsorbent be improved, synchronously realize minimizing and the resource utilization of excess sludge.
In order to achieve the above object, research of the present invention finds: the aerobic fermentation of excess sludge is under aerobic condition, microbic activity in excess sludge is utilized to be utilized further by the small organic molecule being adsorbed on bacterial cell surface, change into thalline and zoogleic secretory product, and the material heavy metal ion such as polysaccharide, protein and nucleic acid of comprising in these thalline and secretory product has good adsorption.Through aerobic fermentation, the organism in mud supernatant liquor is in the thalline of living and zoogleic absorption, concentration reduces greatly under metabolism.Simultaneously, the dewatering of extracellular polymeric on active sludge has important impact, the reason that mud is difficult to dewater is exactly the existence due to extracellular polymeric, it is enclosed in around bacterium as capsule, its existence makes more moisture be combined in active pollution index, this part water is difficult to be removed by mechanical dehydration, and therefore in active sludge, the content of extracellular polymeric is higher, and dewatering is poorer.
Property that tensio-active agent has " amphiphilic ", and hydrophilic and close oil properties, but also there is the effect of " solubilising ", therefore tensio-active agent can be utilized to promote the release of excess sludge extracellular polymeric, make the Bound moisture be wrapped in extracellular polymeric be transformed into free water, thus realize reinforcement sludge dehydration and improve biological adsorption agent output.Up to the present, not yet report about utilizing tensio-active agent to realize reinforcement sludge dehydration and improve biological adsorption agent product quantifier elimination simultaneously.The present invention is first from adopting the urban wastewater treatment firm of biological treatment to obtain excess sludge for this reason, measures tensio-active agent in mass ratio: mud dry weight=0.01 ~ 0.3:1; Then they mixed, carry out aerobic fermentation cultivation, then carry out mechanism filter-pressing to mud after fermentation, after press filtration, mud cake is dewatered sludge, and filtrate is liquid biological sorbent material, by filtrate preservation at 0 ~ 5 DEG C in refrigerator, for subsequent use;
Above-mentioned tensio-active agent is anion surfactant, or cats product, or nonionogenic tenside, or amphoterics, or bio-surfactant;
Above-mentioned mixing adopts mechanical stirring or aeration agitation mode that tensio-active agent is mixed with mud;
It is be 5 ~ 9 by pH that above-mentioned aerobic fermentation is cultivated, and concentration is that the excess sludge of 3 ~ 15g/L is put into fermentor tank and fermented, and realizing dissolved oxygen concentration in fermentor tank by aeration is 0.5 ~ 6.5mg/L, and leavening temperature is 25 ~ 55 DEG C, and fermentation time is 2 ~ 24h;
Above-mentioned mechanism filter-pressing is that mud after fermentation is adopted sheet frame dehydration, or belt type dehydration, or centrifuge dehydration, or the dehydration of folded spiral shell.
The present invention has the following advantages and effect:
(1) excess sludge of urban wastewater treatment firm is utilized, the output utilizing mud to prepare biological adsorption agent is substantially increased by the synergy of tensio-active agent and aerobic fermentation, not only achieve sludge reduction, stabilization, resource utilization and reduce the object of mud organic substance contaminate environment, produce the product Biosorbent for heavy metals of utility value, be the Mode of Circular of a kind of Sustainable development of urban wastewater treatment firm simultaneously.
(2) Biosorbent for heavy metals produced can be used for the wastewater treatment containing heavy metal ion, heavy metal has been reclaimed while realizing sewage disposal, with low cost owing to utilizing excess sludge to prepare Biosorbent for heavy metals, the loading capacity of Biosorbent for heavy metals heavy metal ion is large, therefore the processing cost of heavy metal ion-containing waste water be can reduce, Pollution abatement and the dual income of resource reclaim achieved.
(3) tensio-active agent is while the macromolecular releases such as promotion extracellular polymeric, the Bound moisture be wrapped in extracellular polymeric is made to become free water, by the mud-water separation mode of mechanical dehydration, achieve the dehydrating effect that also provide enhanced mud while prepared by biological adsorption agent, this reduces cost of investment also have important directive significance to improving, optimizing existing sludge treating system.
Embodiment
Embodiment 1
This embodiment adopts traditional technology, carries out aerobic fermentation under namely not adding the same terms of tensio-active agent.Concrete technology is: the working volume made at synthetic glass is in the cylindrical reactor of 5 liters, (its water ratio is 97.7% to add excess sludge, sludge concentration is 8.02g/L, pH=7.02) as the raw material preparing biological adsorption agent, at room temperature, the dissolved oxygen concentration in maintenance reactor is at 2 ~ 3mg/L.The aerobic fermentation time is 4 ~ 8 hours to excess sludge in the reactor, fermented sludge suction filtration 30 minutes under the constant voltage of 0.05MPa, the output of biological adsorption agent contained by filtrate is the 13.28 ~ 22.06mg/gVSS output of biological adsorption agent (in the volatile suspended solid of unit weight), the water ratio of mud cake is 78.87% ~ 82.21%, fermented sludge is at 12000 revs/min, under the condition of 4 DEG C centrifugal 10 minutes, the output detecting contained biological adsorption agent in the supernatant liquor that obtains of analysis centrifugal is the 12.82 ~ 20.23mg/gVSS output of biological adsorption agent (in the volatile suspended solid of unit weight).The water ratio of the centrifugal bottom mud cake obtained is 80.38 ~ 85.42%.
Embodiment 2
The working volume made at synthetic glass is in the cylindrical reactor of 5 liters, (its water ratio is 97.7% to add excess sludge, sludge concentration is 8.02g/L, pH=7.02) as the raw material preparing biological adsorption agent, at room temperature, dissolved oxygen concentration in maintenance reactor, at 2 ~ 3mg/L, adds anionic surfactant sodium dodecylbenzene sulfonate.Microorganism in mud utilizes the organism in mud supernatant liquor to be transformed into the meta-bolites of self---biological adsorption agent, the biological adsorption agent be enclosed on microorganism cells film surface is made to be discharged in solution by the solublization of tensio-active agent, the Bound moisture be wrapped in extracellular polymeric becomes free water, achieves the preparation of biological adsorption agent and the strengthen dewatering of mud simultaneously.Wherein, the consumption of tensio-active agent and the ratio of mud dry weight are 0.1:1, the aerobic fermentation time is 8 hours to excess sludge in the reactor, fermented sludge suction filtration 30 minutes under the constant voltage of 0.05MPa, the output of biological adsorption agent contained by filtrate is the 82.28mg/gVSS output of biological adsorption agent (in the volatile suspended solid of unit weight), the water ratio of mud cake is 69.56%, with do not add compared with anionic surfactant sodium dodecylbenzene sulfonate, the output increased of biological adsorption agent more than 2.7 times, moisture content of the cake reduces more than 11.8%.
Embodiment 3
The working volume made at synthetic glass is in the cylindrical reactor of 5 liters, (its water ratio is 97.7% to add excess sludge, sludge concentration is 8.02g/L, pH=7.02) as the raw material preparing biological adsorption agent, at room temperature, dissolved oxygen concentration in maintenance reactor, at 2 ~ 3mg/L, adds cats product hexadecyldimethyl benzyl ammonium brometo de amonio.Microorganism in mud utilizes the organism in mud supernatant liquor to be transformed into the meta-bolites of self---biological adsorption agent, the biological adsorption agent be enclosed on microorganism cells film surface is made to be discharged in solution by the solublization of tensio-active agent, the Bound moisture be wrapped in extracellular polymeric becomes free water, achieves the preparation of biological adsorption agent and the strengthen dewatering of mud simultaneously.Wherein, the consumption of tensio-active agent and the ratio of mud dry weight are 0.05:1, the aerobic fermentation time is 4 hours to excess sludge in the reactor, fermented sludge suction filtration 30 minutes under the constant voltage of 0.05MPa, the output of biological adsorption agent contained by filtrate is the 70.82mg/gVSS output of biological adsorption agent (in the volatile suspended solid of unit weight), the water ratio of mud cake is 66.38%, with do not add compared with cats product hexadecyldimethyl benzyl ammonium brometo de amonio, the output increased of biological adsorption agent more than 2.2 times, moisture content of the cake reduces more than 15.8%.
Embodiment 4
The working volume made at synthetic glass is in the cylindrical reactor of 5 liters, (its water ratio is 97.7% to add excess sludge, sludge concentration is 8.02g/L, pH=7.02) as the raw material preparing biological adsorption agent, at room temperature, dissolved oxygen concentration in maintenance reactor, at 2 ~ 3mg/L, adds non-ionic surfactant Tween-80.Microorganism in mud utilizes the organism in mud supernatant liquor to be transformed into the meta-bolites of self---biological adsorption agent, the biological adsorption agent be enclosed on microorganism cells film surface is made to be discharged in solution by the solublization of tensio-active agent, the Bound moisture be wrapped in extracellular polymeric becomes free water, achieves the preparation of biological adsorption agent and the strengthen dewatering of mud simultaneously.Wherein, the consumption of tensio-active agent and the ratio of mud dry weight are 0.1:1, the aerobic fermentation time is 4 hours to excess sludge in the reactor, fermented sludge suction filtration 30 minutes under the constant voltage of 0.05MPa, the output of biological adsorption agent contained by filtrate is the 64.62mg/gVSS output of biological adsorption agent (in the volatile suspended solid of unit weight), the water ratio of mud cake is 72.52%, with do not add compared with non-ionic surfactant Tween-80, the output increased of biological adsorption agent more than 1.9 times, moisture content of the cake reduces more than 8.1%.
Embodiment 5
The working volume made at synthetic glass is in the cylindrical reactor of 5 liters, (its water ratio is 96.9% to add excess sludge, sludge concentration is 8.10g/L, pH=6.98) as the raw material preparing biological adsorption agent, at room temperature, dissolved oxygen concentration in maintenance reactor, at 2 ~ 3mg/L, adds amphoteric ionic surface active agent 2-alkyl-N-hydroxyethyl-N-hydroxypropyl sulfo group tetrahydroglyoxaline.Microorganism in mud utilizes the organism in mud supernatant liquor to be transformed into the meta-bolites of self---biological adsorption agent, the biological adsorption agent be enclosed on microorganism cells film surface is made to be discharged in solution by the solublization of tensio-active agent, the Bound moisture be wrapped in extracellular polymeric becomes free water, achieves the preparation of biological adsorption agent and the strengthen dewatering of mud simultaneously.Wherein, the consumption of tensio-active agent and the ratio of mud dry weight are 0.1:1, the aerobic fermentation time is 4 hours to excess sludge in the reactor, fermented sludge suction filtration 30 minutes under the constant voltage of 0.05MPa, the output of biological adsorption agent contained by filtrate is the 61.72mg/gVSS output of biological adsorption agent (in the volatile suspended solid of unit weight), the water ratio of mud cake is 71.41%, with do not add compared with amphoteric ionic surface active agent 2-alkyl-N-hydroxyethyl-N-hydroxypropyl sulfo group tetrahydroglyoxaline, the output increased of biological adsorption agent more than 1.8 times, moisture content of the cake reduces more than 9.5%.
Embodiment 6
The working volume made at synthetic glass is in the cylindrical reactor of 5 liters, (its water ratio is 96.9% to add excess sludge, sludge concentration is 8.10g/L, pH=6.98) as the raw material preparing biological adsorption agent, at room temperature, dissolved oxygen concentration in maintenance reactor, at 2 ~ 3mg/L, adds biotype tensio-active agent rhamnolipid.Microorganism in mud utilizes the organism in mud supernatant liquor to be transformed into the meta-bolites of self---biological adsorption agent, the biological adsorption agent be enclosed on microorganism cells film surface is made to be discharged in solution by the solublization of tensio-active agent, the Bound moisture be wrapped in extracellular polymeric becomes free water, achieves the preparation of biological adsorption agent and the strengthen dewatering of mud simultaneously.Wherein, the consumption of tensio-active agent and the ratio of mud dry weight are 0.1:1, the aerobic fermentation time is 8 hours to excess sludge in the reactor, fermented sludge suction filtration 30 minutes under the constant voltage of 0.05MPa, the output of biological adsorption agent contained by filtrate is the 64.73mg/gVSS output of biological adsorption agent (in the volatile suspended solid of unit weight), the water ratio of mud cake is 72.82%, with do not add compared with biotype tensio-active agent rhamnolipid, the output increased of biological adsorption agent more than 1.9 times, moisture content of the cake reduces more than 7.7%.
Embodiment 7
The working volume made at synthetic glass is in the cylindrical reactor of 5 liters, (its water ratio is 97.1% to add excess sludge, sludge concentration is 8.07g/L, pH=6.98) as the raw material preparing biological adsorption agent, at room temperature, dissolved oxygen concentration in maintenance reactor, at 2 ~ 3mg/L, adds cats product hexadecyldimethyl benzyl ammonium brometo de amonio.Microorganism in mud utilizes the organism in mud supernatant liquor to be transformed into the meta-bolites of self---biological adsorption agent, the biological adsorption agent be enclosed on microorganism cells film surface is made to be discharged in solution by the solublization of tensio-active agent, the Bound moisture be wrapped in extracellular polymeric becomes free water, achieves the preparation of biological adsorption agent and the strengthen dewatering of mud simultaneously.Wherein, the consumption of tensio-active agent and the ratio of mud dry weight are 0.05:1, the aerobic fermentation time is 4 hours to excess sludge in the reactor, fermented sludge is at 12000 revs/min, under the condition of 4 DEG C centrifugal 10 minutes, in supernatant liquor, the output of contained biological adsorption agent is the 63.67mg/gVSS output of biological adsorption agent (in the volatile suspended solid of unit weight), the water ratio of bottom mud cake is 70.38%, with do not add compared with cats product hexadecyldimethyl benzyl ammonium brometo de amonio, the output increased of biological adsorption agent more than 2.1 times, moisture content of the cake reduces more than 12.4%.
Embodiment 8
The working volume made at synthetic glass is in the cylindrical reactor of 5 liters, (its water ratio is 97.1% to add excess sludge, sludge concentration is 8.07g/L, pH=6.98) as the raw material preparing biological adsorption agent, at room temperature, dissolved oxygen concentration in maintenance reactor, at 2 ~ 3mg/L, adds anionic surfactant sodium dodecylbenzene sulfonate.Microorganism in mud utilizes the organism in mud supernatant liquor to be transformed into the meta-bolites of self---biological adsorption agent, the biological adsorption agent be enclosed on microorganism cells film surface is made to be discharged in solution by the solublization of tensio-active agent, the Bound moisture be wrapped in extracellular polymeric becomes free water, achieves the preparation of biological adsorption agent and the strengthen dewatering of mud simultaneously.Wherein, the consumption of tensio-active agent and the ratio of mud dry weight are 0.1:1, the aerobic fermentation time is 8 hours to excess sludge in the reactor, fermented sludge is at 12000 revs/min, under the condition of 4 DEG C centrifugal 10 minutes, in supernatant liquor, the output of contained biological adsorption agent is the 74.89mg/gVSS output of biological adsorption agent (in the volatile suspended solid of unit weight), the water ratio of bottom mud cake is 73.38%, with do not add compared with anionic surfactant sodium dodecylbenzene sulfonate, the output increased of biological adsorption agent more than 2.7 times, moisture content of the cake reduces more than 8.7%.
Embodiment 9
The working volume made at synthetic glass is in the cylindrical reactor of 5 liters, (its water ratio is 97.3% to add excess sludge, sludge concentration is 8.04g/L, pH=7.08) as the raw material preparing biological adsorption agent, at room temperature, dissolved oxygen concentration in maintenance reactor, at 2 ~ 3mg/L, adds amphoteric ionic surface active agent 2-alkyl-N-hydroxyethyl-N-hydroxypropyl sulfo group tetrahydroglyoxaline.Microorganism in mud utilizes the organism in mud supernatant liquor to be transformed into the meta-bolites of self---biological adsorption agent, the biological adsorption agent be enclosed on microorganism cells film surface is made to be discharged in solution by the solublization of tensio-active agent, the Bound moisture be wrapped in extracellular polymeric becomes free water, achieves the preparation of biological adsorption agent and the strengthen dewatering of mud simultaneously.Wherein, the consumption of tensio-active agent and the ratio of mud dry weight are 0.1:1, the aerobic fermentation time is 4 hours to excess sludge in the reactor, fermented sludge is at 12000 revs/min, under the condition of 4 DEG C centrifugal 10 minutes, in supernatant liquor, the output of contained biological adsorption agent is the 60.21mg/gVSS output of biological adsorption agent (in the volatile suspended solid of unit weight), the water ratio of bottom mud cake is 71.92%, with do not add compared with amphoteric ionic surface active agent 2-alkyl-N-hydroxyethyl-N-hydroxypropyl sulfo group tetrahydroglyoxaline, the output increased of biological adsorption agent more than 2.0 times, moisture content of the cake reduces more than 10.5%.
Claims (1)
1. synchronously realize a method for mud strengthen dewatering and raising biological adsorption agent output, it is characterized in that:
First from adopting the urban wastewater treatment firm of biological treatment to obtain excess sludge, measure tensio-active agent in mass ratio: mud dry weight=0.01-0.3:1; They mixed, then carry out aerobic fermentation cultivation, finally carry out mechanism filter-pressing to mud after fermentation, after press filtration, mud cake is dewatered sludge, and filtrate is liquid biological sorbent material, filtrate is placed on preservation at 0-5 DEG C in refrigerator, for subsequent use;
Above-mentioned tensio-active agent is anion surfactant, or cats product, or nonionogenic tenside, or amphoterics, or bio-surfactant;
Above-mentioned mixing adopts mechanical stirring or aeration agitation mode that tensio-active agent is mixed with mud;
It is be 5-9 by pH that above-mentioned aerobic fermentation is cultivated, and concentration is that the excess sludge of 3-15g/L is put into fermentor tank and fermented, and make dissolved oxygen concentration in fermentor tank be 0.5-6.5mg/L by aeration, leavening temperature is 25-55 DEG C, and fermentation time is 2-24h;
Above-mentioned mechanism filter-pressing is that mud after fermentation is adopted sheet frame dehydration, or belt type dehydration, or centrifuge dehydration, or the dehydration of folded spiral shell.
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| CN116114571A (en) * | 2022-12-07 | 2023-05-16 | 中交（天津）生态环保设计研究院有限公司 | Method for preparing greening soil by dehydrating and synchronously fermenting engineering bags of soil at dredging bottom of river and lake |
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