CN103771671B - Excess sludge treatment method - Google Patents
Excess sludge treatment method Download PDFInfo
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- CN103771671B CN103771671B CN201210408428.0A CN201210408428A CN103771671B CN 103771671 B CN103771671 B CN 103771671B CN 201210408428 A CN201210408428 A CN 201210408428A CN 103771671 B CN103771671 B CN 103771671B
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Abstract
The invention discloses an excess sludge treatment method which comprises the following steps: adding excess sludge to a reaction tank, with high speed stirring at 15-50 DEG C, adding a surfactant and sodium percarbonate to the reaction tank, after 0.5-5h of reaction, adding nano zero-valent iron, at 15-50 DEG C reacting for 1-8h, sending the sludge into a magnetic separator to remove the nano zero-valent iron containing heavy metals in the sludge; performing mechanical dewatering of the treated sludge to respectively obtain purified sludge and water. The excess sludge treated by the method is low in water content and high in heavy metal removal rate, the treated water is low in (chemical oxygen demand) COD value, and the excess sludge treatment method is low in cost, green, and free of secondary pollution, and can lay a foundation for agricultural or forestry sludge or other resource method.
Description
Technical field
The present invention relates to a kind for the treatment of process of mud, particularly relate to a kind of method adopting tensio-active agent-nano zero valence iron-magneticseparation-mechanical dehydration combination process lignin-sludge.
Background technology
Along with municipal sewage treatment standard is more and more stricter, in municipal sewage treatment process, the output of mud also increases by a wide margin, along with the continuous increase of sludge quantity, incident is the handling problems of mud, and its disposal options mainly contains landfill, burning, fall sea and agricultural use etc.No matter take which kind of disposal options, reducing moisture percentage in sewage sludge is basis.How effectively to reduce moisture percentage in sewage sludge and be beneficial to subsequent disposal, research and develop the research emphasis that the cost-effective new technology improving dewatering performance of sludge will be current sludge treatment.For the recycling of mud, think that most potential sludge treating method is exactly Land_use change at present, the method not only can effectively utilize nutritive substance useful in mud, makes it again participate in the material cycle of the ecosystem, and low cost, the amount of dissolving is also very large.But heavy metal becomes the main limiting factor of agricultural sludge, no matter be that mud is directly applied farmland through simple process, or using sludge fermentation as organic raw material, produce fertilizer or composite organic-inorganic fertilizer, all inevitably bring environmentally harmful heavy metal into environment.Simultaneously a large amount of in mud heavy metals, easily causes secondary pollution to soil, underground water and animals and plants in Land_use change process, even if also fail the problem of heavy metal through composting have substantial solution.
Nano zero valence iron (nZVI) refer to particle diameter between 1 ~ 100 nm, specific surface area is 10 ~ 70 m
2the FeO particle of/g.Because specific surface area is comparatively large, reactive behavior is comparatively strong, in decontamination mud some heavy metal ion process in, nano zero valence iron shows superior repair ability.When adopting nano zero valence iron to remove different heavy metal ion, according to φ
0fe
2+the relative size of the standard potential of/Fe and concrete metal ion, cutting mechanisms can be divided into surface adsorption-cooperation, surface reduction, surface adsorption-reduction.Because Nanoscale Iron is when removing pollutent, compares traditional material and its removal capacity of method is large and required time is short, efficiency is high, therefore receiving much attention.
CN102500613A relates to a kind of nano zero valence iron-electromagnetism rake renovation of heavy metal polluted soil with combined/sludge processes, its concrete steps are: the soil/mud be subject to processing and nano zero valence iron are fully mixed, soil/Heavy Metals in Sludge part is by nZVI reduction, the surface being partly adsorbed to nZVI, after reaction, clean soil/mud is separated by electromagnetism rake device with nZVI, the magnetic force absorption nZVI of electromagnetism rake by sending, nZVI is fixed on magnetic rake post, is effectively separated.Have simple to operate, Be very effective, cost is low, remediation efficiency high.Just by simply shaking hybrid mode by the stripping of mud combined heavy metal part in water in this invention, effect is poor, and moisture percentage in sewage sludge after process is higher, and floor space is large, is unfavorable for further resource utilization mode such as agricultural grade.
(the Environmental science and technologies such as deer cloud tints, 31st volume the 6th phase in 2008,36) report " cats product is to dewatering performance of sludge influence research ", have studied two kinds containing the cats product cetyl trimethylammonium bromide (CTMAB) of different lengths hydrophobic chain and 4 bromide (TMAB) to the impact of activated sludge dehydration performance, inquire into the mechanism of action of two kinds of tensio-active agents.Under same dosage, CTMAB more effectively can improve the dewatering of mud than TMAB.But simple to add the lysis of tensio-active agent to mud not ideal enough, large usage quantity when being used alone.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of method of residual sludge reduction harmless treatment.Excess sludge adopts that heavy metal removing rate after the inventive method process is high, water ratio is low.
The invention provides a kind of excess sludge treatment process, comprise the steps:
(1) excess sludge is added in reaction container, under 15 ~ 50 DEG C of high-speed stirring, in reaction tube, add cats product and SPC-D, reaction 0.5 ~ 5h;
(2) add nano zero valence iron in the mud obtained to step (1), at 15 ~ 50 DEG C, react 1 ~ 8h;
(3) mud of step (2) gained is sent into magnetic separating apparatus, remove the nano zero valence iron containing heavy metal in mud through Magneto separate;
(4) mud after step (3) process is carried out mechanical dehydration, be purified mud and water.
In the inventive method, described cats product is quaternary cationics, can be specifically Trimethyllaurylammonium bromide, cetyl trimethylammonium bromide, dodecyl dimethyl benzyl ammonium bromide, tridecyl dimethylbenzyl ammonium bromide, tetradecyl dimethyl benzyl ammonium, tridecyldimethylamine base Benzylphosphonium Bromide ammonium, cetyl dimethyl benzyl ammonium bromide, pentadecyldimethylamine base Benzylphosphonium Bromide ammonium or octadecyl dimethyl benzyl brometo de amonio.
In the inventive method, in step (1), the weight ratio that the add-on of tensio-active agent and mud contain thing is admittedly 1:50 ~ 1:10, and the weight ratio that the add-on of SPC-D and mud contain thing is admittedly 1:50 ~ 1:10.
In the inventive method, in step (2), the weight ratio that the add-on of nano zero valence iron and mud contain thing is admittedly 1:20 ~ 1:1, and the median size of described nano zero valence iron is 40 ~ 80nm, and specific surface area is 20 ~ 40m
2/ g, has absorption and reduction dual-use function.
In the inventive method, described mechanical dehydration mode comprises one or more in machine centrifuge, plate-and-frame filter press, stacked sludge dewatering equipment, belt filter press.
In the inventive method, described magnetic separating apparatus can be permanent magnetic separator.
In the inventive method, the nano zero valence iron containing heavy metal obtained after step (3) Magneto separate process can be sent into heavy metal recovery pond and reclaim.After step (4) process, the water of gained, returns sewage work and processes further or reuse, and purification mud can be used as agricultural or forestry mud or is other method of resource.
Compared with prior art, the inventive method tool has the following advantages:
(1) the inventive method is acted on by " amphipathic " and " solubilising " of tensio-active agent, make extracellular polymeric (EPS) stripping on a large amount of mud flco surfaces, the flocculation structure of mud is destroyed, the dispersion of Sludge Surface flocculation structure is disintegrated, discharge the Bound moisture of former flco inside, make height water and EPS split away off.By adding auxiliary agent SPC-D in tensio-active agent, sludge solutions can be made to be alkalescence, reduce sludge flocculation degree, accelerate the dispersion of Sludge Surface flco, alkaline environment is also of value to the broken wall of mud, make mud cell wall lysis and dispersion further, reduce Bound moisture content, more Bound moisture in mud is made to become the free water be easily removed, in Sludge Surface flco and intracellular heavy metal ion also thereupon stripping in water, the effect of follow-up nano zero valence iron removing heavy metal ion can be improved.
(2) the inventive method is by the synergy of tensio-active agent and SPC-D, to the microorganism cells in mud, there is certain destruction, microbial cell wall can be made to crack, make the water in microorganism cells and leaching ability of heavy metal, heavy metal ion stripping is in free water, mobility is better, is more conducive to improving the efficiency of follow-up employing nano zero valence iron except heavy-metal ion removal, and heavy metals removal is more thorough.
(3) in the inventive method, the auxiliary agent SPC-D added not only has active promoting function also to have sterilization, sterilization, decolorizing effect to the molten born of the same parents of mud, greatly can reduce the COD in the rear separating obtained water of process, excess sludge is low through this cover treatment process cost, green non-secondary pollution, after process, water ratio is low, and heavy metal removing rate is high, water outlet COD is lower, can be agricultural or forestry mud or lays the foundation for other method of resource.
Embodiment
Technical solution of the present invention is further illustrated below by specific embodiment.
Embodiment 1
Embodiment excess sludge used takes from Fushun sewage work biochemistry pool excess sludge, and water ratio is 97.5wt%.Mud centrifuged supernatant COD is 2870mg/L.Content is the composition analysis after analytic sample is dried to constant weight at 105 DEG C, and concrete outcome is in table 1.
The analysis of table 1 sample composition
| Composition | Cu | Ni | Zn | Cr | Cd | Pb |
| Content, mg/Kg | 360 | 256.5 | 981.3 | 822.5 | 255.4 | 753.7 |
In the present embodiment, cats product used is cetyl trimethylammonium bromide.
Above-mentioned excess sludge 10kg is added in reaction container, at 28 DEG C, stirs with the stir speed (S.S.) of 5000rpm, in reaction tube, add 15g tensio-active agent and 10g SPC-D simultaneously, reaction 4h; Then in reaction tube, nano zero valence iron 25g is added, 6h is reacted at 28 DEG C, the mud of gained is sent into the nano zero valence iron containing heavy metal in permanent magnetic separator removal mud, heavy-metal movement after absorption reclaims to heavy metal recovery pond, mud after being separated through magnetic separator is carried out centrifuge dehydration, be purified mud and water, centrifugal rear moisture content of the cake is 56.2%, and in water, COD content is 870mg/L.Wherein, sewage returns sewage work and processes further, and the character of gained purification mud is in table 2.
The analysis of table 2 embodiment 1 product composition
| Composition | Cu | Ni | Zn | Cr | Cd | Pb |
| Content, mg/Kg | 11 | 13 | 1 | 0.8 | 0.2 | 1.0 |
Embodiment 2
Adopt identical raw material with embodiment 1, but do not add SPC-D in the first step treating processes, all the other processing condition in the same manner as in Example 1.
In the present embodiment, tensio-active agent used is cetyl trimethylammonium bromide.
Above-mentioned excess sludge 10kg is added in reaction container, at 28 DEG C, stirs with the stir speed (S.S.) of 5000rpm, in reaction tube, add 15g tensio-active agent simultaneously, reaction 4h; Then in reaction tube, nano zero valence iron 25g is added, 6h is reacted at 28 DEG C, the mud of gained is sent into the nano zero valence iron containing heavy metal in permanent magnetic separator removal mud, heavy-metal movement after absorption reclaims to heavy metal recovery pond, mud after being separated through magnetic separator is carried out centrifuge dehydration, be purified mud and water, centrifugal rear moisture content of the cake is 68.8%, and in water, COD content is 1680mg/L.Wherein, sewage returns sewage work and processes further, and the character of gained purification mud is in table 4.
The analysis of table 3 embodiment 1 product composition
| Composition | Cu | Ni | Zn | Cr | Cd | Pb |
| Content, mg/Kg | 28 | 31 | 5 | 1.2 | 0.8 | 1.2 |
Known by table 2,3 data analyses, Of Heavy Metal Level In Sludge is all better than pollutant catabolic gene standard (GB4284-1984) in agricultural sludge after treatment, and water ratio reduces greatly, can utilize as agricultural fertilizer.
Claims (9)
1. an excess sludge treatment process, comprises the steps:
(1) excess sludge is added in reaction container, under 15 ~ 50 DEG C of high-speed stirring, in reaction tube, add cats product and SPC-D, reaction 0.5 ~ 5h;
(2) add nano zero valence iron in the mud obtained to step (1), at 15 ~ 50 DEG C, react 1 ~ 8h;
(3) mud of step (2) gained is sent into magnetic separating apparatus, remove the nano zero valence iron containing heavy metal in mud through Magneto separate;
(4) mud after step (3) process is carried out mechanical dehydration, be purified mud and water.
2. in accordance with the method for claim 1, it is characterized in that: cats product is quaternary cationics.
3. in accordance with the method for claim 2, it is characterized in that: quaternary cationics is Trimethyllaurylammonium bromide, cetyl trimethylammonium bromide, dodecyl dimethyl benzyl ammonium bromide, tridecyl dimethylbenzyl ammonium bromide, tetradecyl dimethyl benzyl ammonium, tridecyldimethylamine base Benzylphosphonium Bromide ammonium, cetyl dimethyl benzyl ammonium bromide, pentadecyldimethylamine base Benzylphosphonium Bromide ammonium or octadecyl dimethyl benzyl brometo de amonio.
4. in accordance with the method for claim 1, it is characterized in that: the weight ratio that the add-on of tensio-active agent and mud contain thing is admittedly 1:50 ~ 1:10, the weight ratio that the add-on of SPC-D and mud contain thing is admittedly 1:50 ~ 1:10.
5. in accordance with the method for claim 1, it is characterized in that: the weight ratio that the add-on of nano zero valence iron and mud contain thing is admittedly 1:20 ~ 1:1, and the median size of nano zero valence iron is 40 ~ 80nm, and specific surface area is 20 ~ 40m
2/ g.
6. in accordance with the method for claim 1, it is characterized in that: mechanical dehydration mode adopts one or more in centrifuge, plate-and-frame filter press, belt filter press, stacked sludge dewatering equipment.
7. in accordance with the method for claim 1, it is characterized in that: magnetic separating apparatus is permanent magnetic separator.
8. in accordance with the method for claim 1, it is characterized in that: after step (4) process, the Water circulation of gained or decontaminated water treatment plant process further.
9. in accordance with the method for claim 1, it is characterized in that: purification mud can be used as agricultural, forestry mud.
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| CN201210408428.0A CN103771671B (en) | 2012-10-24 | 2012-10-24 | Excess sludge treatment method |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105236699B (en) * | 2015-11-16 | 2017-07-28 | 哈尔滨工业大学 | A kind of method of utilization singlet oxygen breaking sludge |
| CN105855287A (en) * | 2016-05-30 | 2016-08-17 | 湖南恒凯环保科技投资有限公司 | Method for ex-situ remediation of organic contaminated soil by virtue of sodium percarbonate-biological pile technique |
| CN106914483A (en) * | 2016-12-22 | 2017-07-04 | 常州大学 | A kind of chelating agent aids in nZVI/Na2CO4The method for cooperateing with rehabilitating soil organo-chlorine pesticide |
| CN108623120B (en) * | 2017-03-21 | 2021-05-28 | 上海利泽环保科技有限公司 | Composition and preparation method and application thereof |
| CN106990027A (en) * | 2017-04-12 | 2017-07-28 | 南京林业大学 | Measure oily sludge centrifugal effect and average grain diameter relation curve and the quick method for judging oily sludge centrifugal effect |
| CN107867790A (en) * | 2017-05-04 | 2018-04-03 | 湖南佰霖生物技术股份有限公司 | A kind of sludge confession heat dehydration drying means and system |
| CN108911459A (en) * | 2018-09-18 | 2018-11-30 | 山东永进节能环保科技有限公司 | A kind of municipal sludge pyrolysis processing set technique and device |
| CN109279746B (en) * | 2018-11-27 | 2021-05-11 | 东华大学 | Method for synchronously improving anaerobic methanogenesis of sludge and reducing resistance genes |
| CN111115993A (en) * | 2019-12-28 | 2020-05-08 | 湖南大学 | Method for improving fluidity of sludge and synchronously reducing apparent viscosity of sludge |
| CN113929195B (en) * | 2021-11-05 | 2023-09-12 | 哈尔滨工业大学 | Preparation method of sludge extracellular polymer composite nano zero-valent iron |
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| CN1787974A (en) * | 2003-04-23 | 2006-06-14 | 凯米拉·开米公司 | Method of treating digested sludge |
| CN102380505A (en) * | 2011-08-08 | 2012-03-21 | 同济大学 | Method for repairing heavy metal-polluted soil or sludge with nano-zero-valent iron (nZVI) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1787974A (en) * | 2003-04-23 | 2006-06-14 | 凯米拉·开米公司 | Method of treating digested sludge |
| CN102380505A (en) * | 2011-08-08 | 2012-03-21 | 同济大学 | Method for repairing heavy metal-polluted soil or sludge with nano-zero-valent iron (nZVI) |
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