CN102276128A - Treatment method of dehydrated sludge in domestic sewage treatment plant - Google Patents
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Abstract
The invention relates to a treatment method of dehydrated sludge in a domestic sewage treatment plant. The treatment method comprises the following steps: evenly mixing limestone, magnesia and bauxite which are weighed in a ratio of (40%-60%):(20%-30%):(20%-30%) by weight percent and then firing for 1-2 hours at the temperature of 900 DEG C-1200 DEG C so as to obtain a sludge solidifying agent; adding the sludge solidifying agent in the dehydrated sludge in the ratio of dehydrated sludge to sludge solidifying agent of (90%-95%):(5%-10%) by weight percent, and then stirring; after evenly mixing, paving the mixture obtained in the former step to the thickness of 20-30 cm in the open air, and placing for 48 hours so as to obtain a sludge solidifying body; and finally, performing landfill treatment. According to the invention, the solidifying time is short, and the adding amount of the sludge solidifying agent is less; by using the treatment method, sludge can be modified, and the stabilization of sludge is promoted; the bulking of the sludge solidifying body is small, the stability and mechanical strength of the sludge solidifying body are high, and secondary pollution can not be caused; and the solidifying technological process is simple and convenient for operation, and the investment and treatment costs are low, thus the treatment method in the invention can be widely applied to stabilization, reduction and innocent treatments of dehydrated sludge in a sewage plant.
Description
Technical field
The present invention relates to the treatment process of sanitary sewage disposal factory dewatered sludge, belong to solid waste comprehensive utilization technique field.
Background technology
In the Collecting and dealing process of municipal effluent, will inevitably produce a large amount of mud (according to statistics, the whole world may produce the dewatered sludge amount in 1 year and reach 100,000,000 t), along with development of Chinese economy, population increase, the reinforcement of people's Environmental awareness and to the raising of environmental quality requirement, make increasing waste water need to handle.By the end of the end of the year 2002,537 of existing municipal sewage plants, the whole nation, processing power reaches 13,000,000,000 t.Press water ratio 80% and calculate, can produce dewatered sludge 1,300 ten thousand t/a.Plan according to municipal sewage treatment in China's national economy evolutionary operation(EVOP) and the water prevention and cure of pollution planning: by 2010, the municipal sludge quantity discharged will reach more than 1,200 ten thousand t/a (dry-matter), can produce more than dehydration municipal sludge 3,000 ten thousand t/a of water ratio about 80%.So the municipal sludge of enormous amount will cause secondary pollution to environment as can not get appropriate disposal.Therefore, how rationally to dispose sewage plant sludge, the outlet that solves municipal sludge has become very urgent task.
Mud is a kind of thick material that produces in the sewage treatment process, it is based on aerobic, anaerobion, also sneaks into the mixture of multiple complexity such as thereon organism of the silt particle, fiber, plant and animal residues and the absorption thereof that have in the raw waste water, metal, germ, worm's ovum, colloid simultaneously.The composition difference of mud is bigger, with the source of sewage, and the difference in sewage treatment process and season and changing.Mud have volume greatly, very easily corrupt malodorous physics and chemistry characteristics, thereby very be unfavorable for handling and transportation.
Contain a large amount of organic matters and nutritive element in the mud, have agricultural resource utilization to be worth, can also brickmaking, make biochemical fiberboard, potting grain etc.But also may contain a large amount of heavy metal substances, pathogenic bacteria, viral micro-organisms and a large amount of toxic organic compounds on the other hand in the mud, as not dealt carefully with and being disposed, stack and the serious secondary pollution of discharge region surrounding environment causing, particularly along with the fast development of developing country's cities and towns Infrastructure, forbidding of mud ocean landfill, the enforcement of the mud agricultural standards of increasingly stringent, the disposal of mud have become a global environment problem.
It is generally to pay attention to and use more a kind of method on the industrial treatment of mud in recent years that sludge curing is handled.It is meant with physics one chemical process and forms globality a kind of process of cured body preferably with mud granule gluing, fusion and be wrapped in the closely knit inertia base material.Wherein solidify used inert material in solidifying agent, mud is cured body through the formed cured product of solidification treatment.
Stabilization is to change hazardous contaminant into low-solubility, low migration and hypotoxic material process.Stabilization generally can be divided into chemical stabilization and physically stableization.Chemical stabilization is to make toxic substance become insoluble compound by chemical reaction, makes it motionless at stable lattice internal fixing; Physically stableization is mud to be mixed with a kind of opening material (as flyash) generate a kind of coarse grained solid.
The curing of mud and stabilization are generally carried out simultaneously, its mechanism is to add solidifying agent in mud, by series of complex physico-chemical (as hydration reaction), poisonous and hazardous material is fixed in the network chain (lattice) that solidify to form, make it change into similar soil or the very big solid of consolidation strength, on the spot landfill or as material of construction etc.The sludge curing treatment technology both can be used as special industry mud, as sludge containing heavy metal, and oily sludge, the solidification treatment of Hazardous wastess such as electroplating sludge, printing and dyeing sludge also can be used for the solidification treatment of the common sludge that the municipal sewage plant produces.
Chinese patent literature " a kind of sludge solidification and filling processing method " (publication number CN101007696, open August 1 2007 date), a kind of sludge solidification and filling processing method is disclosed, it is admixture solidify material cement, clay or mild clay in mud, each component evenly mixed and stirred to form carry out landfill behind the solid matter and dispose, the consumption of each component proportioning by weight is: 100 parts in mud, cement 15-80 part, clay or mild clay 20-160 part.But the cement solidification increase-volume is bigger, and clay source is not extensive.
Chinese patent literature " solidification processing method of municipal sewage sludge " (publication number CN101050046, open October 10 2007 date), adopt cement as solidifying agent, adopt the oxide compound of lime, aluminium salt and aluminium, in the cinder one or more as coagulant aids.Add the solidifying agent of 3-8% in mud, the coagulant aids of 1-8% in the landfill yard that tiles, covers waterproof membrane after mechanical stirring is even, and dry type maintenance 3-15 days after maintenance is finished, can be proceeded follow-up landfill.This treatment process is solidifying agent with cement, also have the bigger problem of increase-volume, and the curing conservation time is longer, and efficient is lower.
Chinese patent literature " dewatered sludge that Sewage Plant produces is cured/the stabilization treatment solidifying agent " (publication number CN101172749, open May 7 2008 date), what relate to is that the dewatered sludge that Sewage Plant produces is cured/the stabilization treatment solidifying agent, it is characterized in that in dewatered sludge, adding by weight proportion solidify material and auxiliary solidify material wilkinite, with each component mixing and stirring, the shared weight percent of each component is: mud 30～80%, solidify material 15～30%, wilkinite 5～40%; Above-mentioned solidify material is by cement, lime, flyash and gypsum, and each moiety mass ratio is a cement: lime: flyash: gypsum=(13～18): (1～4): (1～3): (1～3).The addition of solidifying agent in application is bigger described in this invention.
Chinese patent literature " mud, sludge solidifying agent " (publication number CN101638311, open February 3 2010 date) discloses a kind of mud, sludge solidifying agent.This invention is made up of the major ingredient of 95% cementation and the auxiliary material of 5% katalysis; Wherein, described major ingredient is made up of following raw material: coal gangue, wilkinite, wollastonite, volcanic ash soil, slag, flyash, grey rock, carbide slag; Described auxiliary material is made up of the raw material of following weight parts: polyacrylamide, trolamine, silica powder, aerosil, cupric oxide, ferric oxide, calcium hydroxide, water glass, phosphoric acid.Adopt above-mentioned solidifying agent 5%-10% and mud, mud evenly to stir, just can realize initial set after 5 hours, solidify fully within one month, ultimate compression strength can reach 0.8MPa～5MPa.And objectionable impurities is included in wherein, can overflow the formation secondary pollution.Mud behind overcuring, mud can replace a cubic meter material, embankment utilization in addition.The raw material type that this invention is adopted is various, and the source is not extensive, and curing time is very long, and efficient is very low.
Summary of the invention
The present invention aims to provide a kind of capital construction and working cost is low, technical process is simple, convenient operating maintenance, the little dewatered sludge solidification processing method of secondary pollution.
In order to achieve the above object, the present invention is performed such.The contriver finds by the character of research life sewage work dewatered sludge: 1, organic matter has very strong retentiveness, and the organic content height is the high basic reason of dewatered sludge water ratio; 2, the hole major part of dewatered sludge all is full of by water, during pressure-bearing bigger distortion will take place; 3, with reference to the plasticity chart classification, dewatered sludge belongs to high liquid limit opaque organophilic clay; 4, because dewatered sludge has very strong retentiveness, it is slower that moisture content of the cake is reduced to 65% process, and when mud is crossed tacky state after, water ratio decline is very fast; But 5, adopt the method for natural drying to make moisture percentage in sewage sludge drop to landfill level (60%～65%), take up an area of greatly, the labour intensity height, operability is relatively poor.
According to above-mentioned research conclusion, the contriver adopts the chemosetting medicament that the dewatered sludge modification is handled, and reduces moisture percentage in sewage sludge, strengthens the mud physical strength, makes mud energy safety, sanitary landfill at low cost, or does other recycling treatment.Concrete principle and technological process are as follows:
The first step, the preparation sludge solidifying agent
Measure Wingdale earlier: magnesia: bauxitic clay=40%～60%: 20%～30%: 20%～30% weight percent, then Wingdale, magnesia and three kinds of mineral dusts of bauxitic clay are mixed the back calcination, calcination temperature is 900 ℃～1200 ℃, and calcination 1～2h obtains sludge solidifying agent;
Above-mentioned Wingdale originates from Chaohu, Anhui, wherein the main component calcium oxide content be 80%～85%, magnesium oxide 0.1%～0.5%, aluminium sesquioxide 0.02%～0.1%, silica 1 %～2%; Other compositions Fe
2O
31%～2%, SO
31%～2%, lime-ash 11.88%～13.4%;
Above-mentioned magnesia is fired levigate forming by the magnesite process in Chaohu, Anhui, and wherein main component is magnesium oxide 70%～84%, calcium oxide 0.5%～2%, silicon-dioxide 2%～10%; Other compositions Fe
2O
32%～3%, SO
30.5%～1%, lime-ash 11%～14%;
Above-mentioned bauxitic clay originates from Chaohu, Anhui, wherein main component aluminium sesquioxide content be 50%～55%, calcium oxide 0.8%～1.0%, silicon-dioxide 3%～4%, other compositions Fe
2O
32%～3%, SO
31%～2%, lime-ash 38.2%～40%;
Second step, the processing of dewatered sludge
Measure dewatered sludge: sludge solidifying agent=90%～95%: 5%～10% weight percent, admixture sludge solidifying agent in dewatered sludge then, stir, pave in the open after mixing and place 48h, paving thickness is 20～30cm, obtains the sludge curing body, after testing, this sludge curing body water ratio and physical strength all meet " household refuse landfill sites pollution control criterion " (GB 16889-2008), carry out landfill at last and dispose;
Above-mentioned dewatered sludge is that water ratio is not higher than 80% sanitary sewage disposal factory dewatered sludge.
Advantage of the present invention and effect are:
1. sludge solidifying agent activity of the present invention is higher, so set time is short, and (48h) solidifies mud in a short time, reaches the landfill requirement; And solidifying agent is adding less, only is 5%～11% of sludge quantity.
2. sludge solidifying agent of the present invention is adding less, so the increase-volume of sludge curing body is smaller.
3. sludge solidifying agent of the present invention adopts the toxicological harmless inorganics to prepare, so sludge solidifying agent can be to not causing secondary pollution, and can promote sludge stabilization to sludge modification.
4. the water reaction in sludge solidifying agent of the present invention and the mud, form a large amount of mirabilitum crystallina pomegranate stones and multinuclear water hydroxyl closes magnesium ion, and set up hydrate structure net, so cured body stability is high, less through the water ratio rising of water logging bubble back, still can keep higher physical strength;
5. compare with existing employing cement solidification technology, sludge solidifying agent of the present invention is adding less, and it is effective to subtract appearance; Compare with the lime curing process, solidifying agent curing time of the present invention is shorter, and intensity is higher, and volume can not expand; Therefore simple, the convenient transportation of sludge curing process, processing costs are low.
Embodiment
Embodiment 1
Large-scale household refuse landfill sites carries out sludge curing processing pilot scale in Shanghai.
The first step, to take from 55%: 20%: the 25% by weight percentage compatibility of three kinds of mineral dusts of Wingdale, magnesia, bauxitic clay in Chaohu, Anhui, and mix the back calcination then, calcination temperature is 1000 ℃, calcination time is 2h, obtains sludge solidifying agent after the cooling.After testing, the weight percent of each component is MgO=10%～30% in this sludge solidifying agent, Al
2O
3=15%～20%, CaO=40%～45%, SiO
2=4%～8%, Fe
2O
3=2%～3%, SO
3=1%～2%, ash content=8%～12%;
The main component CaO of above-mentioned Wingdale is 82.1%, MgO is 0.5%, Al
2O
3Be 0.05%, SiO
2Be 3.6%, Fe
2O
3Be 1.25%, SO
3Be 1.1%, lime-ash is 11.4%.
Above-mentioned magnesia main component is MgO 73.5%, CaO 2.2%, SiO
29%, Fe
2O
32.5%, SO
30.8%, lime-ash 12%.
Above-mentioned bauxitic clay main component is Al
2O
353.6%, CaO 0.8%, SiO
23.1%, Fe
2O
32%, SO
31.5%, lime-ash 39%.
Second goes on foot, and measures the dewatered sludge (water ratio of this dewatered sludge is 73.3%, and ultimate compression strength is lower than 3kPa) of Shanghai City sanitary sewage disposal factory: the sludge solidifying agent that the first step makes=92%: 8%, the about 6t of gross weight.Dewatered sludge and sludge solidifying agent are put into stirrer, stir 3min and mix the back discharging, open-air paving thickness is 20～30cm maintenance 48h, obtains the sludge curing body, after testing, and the character such as the table 1 of this sludge curing body water ratio and physical strength etc.All meet " household refuse landfill sites pollution control criterion " (GB16889-2008), carry out landfill at last and dispose.
The character of table 1 sludge curing body
The main hydraulic gelling reaction of dewatered sludge and sludge solidifying agent is as follows in above-mentioned second step:
3CaO·Al
2O
3+6H
2O→3CaO·Al
2O
3·6H
2O (1)
Claims (1)
1. the treatment process of a sanitary sewage disposal factory dewatered sludge is characterized in that:
The first step, the preparation sludge solidifying agent
Measure Wingdale earlier: magnesia: bauxitic clay=40%～60%: 20%～30%: 20%～30% weight percent, then Wingdale, magnesia and three kinds of mineral dusts of bauxitic clay are mixed the back calcination, calcination temperature is 900 ℃～1200 ℃, and calcination 1～2h obtains sludge solidifying agent;
Above-mentioned Wingdale originates from Chaohu, Anhui, wherein the main component calcium oxide content be 80%～85%, magnesium oxide 0.1%～0.5%, aluminium sesquioxide 0.02%～0.1%, silica 1 %～2%; Other compositions Fe
2O
31%～2%, SO
31%～2%, lime-ash 11.88%～13.4%;
Above-mentioned magnesia is fired levigate forming by the magnesite process in Chaohu, Anhui, and wherein main component is magnesium oxide 70%～84%, calcium oxide 0.5%～2%, silicon-dioxide 2%～10%; Other compositions Fe
2O
32%～3%, SO
30.5%～1%, lime-ash 11%～14%;
Above-mentioned bauxitic clay originates from Chaohu, Anhui, wherein main component aluminium sesquioxide content be 50%～55%, calcium oxide 0.8%～1.0%, silicon-dioxide 3%～4%, other compositions Fe
2O
32%～3%, SO
31%～2%, lime-ash 38.2%～40%;
Second step, the processing of dewatered sludge
Measure dewatered sludge: sludge solidifying agent=90%～95%: 5%～10% weight percent, admixture sludge solidifying agent in dewatered sludge then, stir, pave in the open after mixing and place 48h, paving thickness is 20～30cm, obtains the sludge curing body, after testing, this sludge curing body water ratio and physical strength all meet " household refuse landfill sites pollution control criterion " (GB 16889-2008), at last sludge curing body landfill are disposed;
Above-mentioned dewatered sludge is that water ratio is not higher than 80% sanitary sewage disposal factory dewatered sludge.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102976586A (en) * | 2012-12-19 | 2013-03-20 | 天津生态城环保有限公司 | Silt curing agent containing industrial waste carbide slag and curing method |
| CN103359907A (en) * | 2013-07-04 | 2013-10-23 | 南京万德斯环保科技有限公司 | Novel environment friendly conditioner for deep dehydration of sludge |
| CN103359815A (en) * | 2013-07-18 | 2013-10-23 | 南京万德斯环保科技有限公司 | Novel high-efficiency environment-friendly coagulating agent used for treating turbid water or polluted water |
| CN103588319A (en) * | 2013-10-19 | 2014-02-19 | 叶绍朋 | Heavy metal wastewater treatment technology, processing method thereof, and medicine production formula |
| CN104176900A (en) * | 2014-08-21 | 2014-12-03 | 北京同创碧源水务科技发展有限公司 | Deep dehydration method of sludge after domestic sewage treatment |
| CN104671635A (en) * | 2015-01-27 | 2015-06-03 | 上海隧道工程有限公司 | Construction method for treating waste mud produced during bored pile construction |
| CN104710161A (en) * | 2015-03-19 | 2015-06-17 | 柳超 | Curing agent for enhancing intensity of ceramsite and preparation method of curing agent |
| CN105152518A (en) * | 2015-07-24 | 2015-12-16 | 合肥蓝科新材料有限公司 | Magnesia-containing sludge curing agent for preparing high-strength sludge bricks |
| CN105174685A (en) * | 2015-06-29 | 2015-12-23 | 马鞍山金晟工业设计有限公司 | Magnesia-containing silt curing agent for high strength silt brick preparation |
| CN105174684A (en) * | 2015-06-29 | 2015-12-23 | 马鞍山金晟工业设计有限公司 | Carbon fiber-containing silt curing agent for anti-cracking silt brick preparation |
| CN105693051A (en) * | 2016-03-11 | 2016-06-22 | 河北煜环环保科技有限公司 | Curing and stabilizing agent for tannery sludge and method for treating pollution through curing and stabilizing agent |
| CN111570461A (en) * | 2020-05-29 | 2020-08-25 | 中国环境科学研究院 | Refuse landfill covering mode |
| CN111661993A (en) * | 2019-03-06 | 2020-09-15 | 上海助瀛环保科技有限公司 | Sludge curing agent and preparation method and use method thereof |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102976586A (en) * | 2012-12-19 | 2013-03-20 | 天津生态城环保有限公司 | Silt curing agent containing industrial waste carbide slag and curing method |
| CN103359907A (en) * | 2013-07-04 | 2013-10-23 | 南京万德斯环保科技有限公司 | Novel environment friendly conditioner for deep dehydration of sludge |
| CN103359815A (en) * | 2013-07-18 | 2013-10-23 | 南京万德斯环保科技有限公司 | Novel high-efficiency environment-friendly coagulating agent used for treating turbid water or polluted water |
| CN103588319A (en) * | 2013-10-19 | 2014-02-19 | 叶绍朋 | Heavy metal wastewater treatment technology, processing method thereof, and medicine production formula |
| CN104176900A (en) * | 2014-08-21 | 2014-12-03 | 北京同创碧源水务科技发展有限公司 | Deep dehydration method of sludge after domestic sewage treatment |
| CN104671635B (en) * | 2015-01-27 | 2017-03-08 | 上海隧道工程有限公司 | For processing the construction method of bored pile construction discarded slurry |
| CN104671635A (en) * | 2015-01-27 | 2015-06-03 | 上海隧道工程有限公司 | Construction method for treating waste mud produced during bored pile construction |
| CN104710161A (en) * | 2015-03-19 | 2015-06-17 | 柳超 | Curing agent for enhancing intensity of ceramsite and preparation method of curing agent |
| CN105174685A (en) * | 2015-06-29 | 2015-12-23 | 马鞍山金晟工业设计有限公司 | Magnesia-containing silt curing agent for high strength silt brick preparation |
| CN105174684A (en) * | 2015-06-29 | 2015-12-23 | 马鞍山金晟工业设计有限公司 | Carbon fiber-containing silt curing agent for anti-cracking silt brick preparation |
| CN105152518A (en) * | 2015-07-24 | 2015-12-16 | 合肥蓝科新材料有限公司 | Magnesia-containing sludge curing agent for preparing high-strength sludge bricks |
| CN105693051A (en) * | 2016-03-11 | 2016-06-22 | 河北煜环环保科技有限公司 | Curing and stabilizing agent for tannery sludge and method for treating pollution through curing and stabilizing agent |
| CN111661993A (en) * | 2019-03-06 | 2020-09-15 | 上海助瀛环保科技有限公司 | Sludge curing agent and preparation method and use method thereof |
| CN111570461A (en) * | 2020-05-29 | 2020-08-25 | 中国环境科学研究院 | Refuse landfill covering mode |
| CN111570461B (en) * | 2020-05-29 | 2021-07-23 | 中国环境科学研究院 | Refuse landfill covering mode |
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| CN102276128B (en) | 2012-10-03 |
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