CN101456662A - Urban sludge chemical curing method - Google Patents
Urban sludge chemical curing method Download PDFInfo
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- CN101456662A CN101456662A CNA2008102414966A CN200810241496A CN101456662A CN 101456662 A CN101456662 A CN 101456662A CN A2008102414966 A CNA2008102414966 A CN A2008102414966A CN 200810241496 A CN200810241496 A CN 200810241496A CN 101456662 A CN101456662 A CN 101456662A
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Abstract
The invention relates to a method for curing urban sludge by a chemical method. The method comprises the following steps: quicklime powder is added into the urban sludge to destroy a micelle structure of the urban sludge, reduce moisture content of the sludge and realize sterilization, deodorization and dehydration of the urban sludge; stable materialized sludge is obtained; the materialized sludge is subjected to a stacking, airing or drying process; the water content is reduced to 10 to 20 percent to realize further dehydration of the sludge; the dehydrated sludge is broken into granular or powdery sludge; the PH value of the sludge is regulated; and the sludge is compacted and buried. The method can effectively treat the urban sludge, realize harmless and reducing treatment of the sludge, solve the problem of environmental pollution of the urban sludge and meet requirement of sustainable development concept of the environmental protection industry.
Description
Technical field
The present invention relates to a kind of treatment process of municipal sludge.
Background technology
Municipal sludge is the solid waste that the municipal sewage plant produces in the process of disposing of sewage.These materials are water content height (70～80%), perishable not only, produce stench, and contain poisonous, harmful carcinogens that a large amount of pathogenic bacterias, parasitic ovum, heavy metal substance (zinc, copper, nickel, lead, chromium, mercury etc.) and polychlorobiphenyl, Dioxins etc. are difficult to degrade.If unprocessed random discharging, mud very easily causes secondary pollution to underground water, soil etc. through the immersion erosion and the seepage of rainwater, and directly harm humans is healthy.
Along with improving constantly of treatment rate of domestic sewage, sewage work builds quantity and increases progressively day by day, and municipal sludge output constantly increases, and mud appears in many cities " the besieged city phenomenon ".Municipal sludge is handled in how innoxious, minimizing, prevents that the generation of municipal sludge secondary pollution from becoming more and more distinct issues.
At present, the Sludge Disposal Techniques that extensively adopts both at home and abroad can reduce five big classes: 1. sanitary landfill; 2. sludge composting; 3. mud heat drying; 4. sludge incineration; 5. recycling sludge utilization.
The comparison sheet of sanitary landfill, burning electricity generation and composting technology sees Table 1.
The domestic city mud is based on direct landfill, and because of dewatered sludge water ratio height (about water ratio 70%～80%), mobile big, the earthing landfill is not dead, power operation difficulty height; The mud that is poured into the landfill district was banked up after for some time, rotted to produce stench, polluted landfill district ambient air; Rot organic water that the back produces of mud contains each heavy metal species and polychlorobiphenyl, Dioxins etc., and the water that permeates the ground causes underground water and soil pollution.
| Item compared | Sanitary landfill | Burn | Heat drying | Compost |
| Engineering reliability | Reliably, belong to treatment process commonly used | More reliable, belong to mature technology abroad | More reliable, belong to mature technology abroad | More reliable, there is practical experience in China |
| Project scale | Scale depends primarily on operation place, landfill storage capacity, equipment configuration and working life, and is generally all bigger. | Separate unit incinerator specification is used 100～500t/d always, and garbage burning factory is generally installed 2～4 incinerators. | Need and the utilizable unit combination that has surplus heat, treatment scale needs according to the decision of UTILIZATION OF VESIDUAL HEAT IN amount size. | Static state or dynamic intermittent formula composting plant are used 100～200t/d always, and dynamically the continous way composting plant can reach 200～400t/d, |
| Technological merit | The processed in units cost is low. | Handle more thorough. | Utilize the existing system waste heat, processing cost is low. | The processed in units cost is low. |
| Technical disadvantages | Mud landfill operation easier is big, takies a large amount of land areas, easily causes the secondary pollution of underground water, soil and air. | Facility investment is big, the processing cost height, and the control of tail gas Environmental indicators is strict. | Be subjected to region limits | The sludge treatment cycle is long, and treatment capacity is little, can only handle the domestic sludge that does not contain heavy metal. |
Table 1
The existing patent application situation of handling about municipal sludge is as follows:
(1) Hohai University's hydrographic water resource and hydro project science National Key Laboratory had a learned dissertation published on the environmental science periodical in 2007: be the experimental study of supplementary additive solidification with the wilkinite.The invention discloses innoxious, the minimizing and the method for resource of a kind of treatment of town sewage and sludge of belonging to solid waste disposal, disposal technology field.This paper at tradition with cement solidification mud, the cement consumption that brings leach liquor pH big and cured body crosses problems such as height, having proposed with the wilkinite is the auxiliary cement solidification of additive, the thinking of stabilization mud. by carrying out unconfined compressive strenght test, toxicity characteristic leaching procedure, intensity, heavy metal leaching yield, leach liquor COD and the pH value of sludge curing body behind the wilkinite mixed in measurement, study this curing, the effect of stabilization method.
(2) Hunan Junxin Environmental Protection Construction Development Co., Ltd. applied for patent in 2007: a kind of sludge solidification and filling processing method.The invention discloses a kind of sludge solidification and filling processing method, 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.This patent disclosure (bulletin) number: 101007696, open (bulletin) day: 20070801.
(3) Hohai University applied for a patent in 2007: the dewatered sludge that Sewage Plant produces is cured/the stabilization treatment solidifying agent.What the present invention relates to is that the dewatered sludge that Sewage Plant produces is cured/the stabilization treatment solidifying agent proportion scale: mud 30～80%, solidify material 15～30%, wilkinite 5～40%; Above-mentioned solidify material is by cement, lime, flyash and gypsum, according to a certain weight ratio.Advantage: the mud after the processing can carry out landfill to be disposed, and carries out renewable resource utilization as soil material; Solidifying agent can improve high-moisture percentage, the low strength character of mud, has the raising solidification effect, reduces the solidify material consumption, reduces the advantage of processing cost.
Summary of the invention
The objective of the invention is to the problems referred to above at existing municipal sludge treatment process existence, providing a kind of can dispose municipal sludge effectively, realize the disposal of innoxious, the minimizing of mud, solve the urban sludge chemical curing method of municipal sludge problem of environmental pollution.
The present invention includes following steps:
(1) in municipal sludge, add calcium lime powder, stirring reaction 10-15min, the add-on of calcium lime powder is the 7-10% of municipal sludge weight;
(2) be 20%-30% with sludge dewatering to water ratio then;
(3) be that the sludge crushing of 20%-30% becomes particulate state and powdery with water ratio, regulate its pH value to 7-9, then the compacting landfill.
The present invention described (2) step can adopt bank up, airing or/and the oven dry method make sludge dewatering.After municipal sludge is handled through the calcium lime powder in (1) step, its water ratio can be reduced to about 50%-60%, stable performance, can not produce stench, bank up after for some time, the moisture in the mud oozes out from the kapillary of materialized mud, and water ratio further reduces, change the heap time of airing about 7 days, water ratio can be reduced to 20%-30% in the mud.
The present invention preferably adopts ammonium hydrogencarbonate to regulate the pH value of mud in described (4) step, and the add-on of ammonium hydrogencarbonate is the 3%-5% of mud weight.
It is the calcium lime powder of 250-300 that the calcium lime powder that the present invention adopts preferably adopts activity index.
Principle of the present invention is as follows:
1, mud materialization principle:
Mainly there are three kinds of forms in water in the municipal sludge, i.e. free state water, physical property combination water (as capillary water, interstitial water, colloid surface planar water) and chemical combination water (water in molecular water, the cell).Free state water can be removed by gravity or machinery, and physical property combination water and chemical combination water need by heat and break chemical bond and remove.
The present invention adds calcium lime powder (CaO) in municipal sludge, hydration reaction (CaO+H takes place for free state water and physical property combination water in the unslaked lime absorption municipal sludge
2O=Ca (OH)
2+ heat ↑), emit heat, destroy the micelle structure of municipal sludge, and part moisture in the evaporation mud, the water ratio of reduction mud.Unslaked lime aquation reaction back forms the high alkalinity solution environmental in mud, the intracellular moisture of microbial bacteria micelle is oozed out, intracellular chemical combination water is transformed into free state water, microorganism is dead in alkaline environment, thereby realize sterilization, deodorizing, the dehydration of municipal sludge, obtain the materialized mud of stable performance.After adding 7% unslaked lime of municipal sludge weight, the water ratio of materialized mud can be reduced to about 60%, because of the materialized mud colloidal structure destroys, there is a large amount of kapillaries in the mud, make things convenient for moisture content in the mud further to ooze out and volatilize, through banking up, airing is or/and stoving process, the water ratio of materialized mud can be reduced to 20%～30%.
2, heavy metal fixation principle in the mud: have various heavy in the mud, it is mainly based on zinc, copper, nickel, chromium, lead, mercury ion, and above-mentioned heavy metal ion can be moved with water, thereby causes underground water and soil pollution.The present invention adds multiple cloudy radical ion (OH in municipal sludge
-, HCO
3 2-) generate water-fast stable compound (as: Cu (OH) with heavy metal ion
2, Ni (OH)
2, ZnCO
3, PbCO
3), heavy metal ion is stablized in mud, and its transport property reduces greatly, thus heavy metal ion is to the pollution of peripheral underground water and soil in the reduction mud.Relevant chemical reaction is as follows:
Zn
2++HCO
3 -+OH
-→ZnCO
3↓+H
2O
Pb
2++HCO
3 -+OH
-→PbCO
3↓+H
2O
Cu
2++OH
-→Cu(OH)
2↓
Ni
2++OH
-→Ni(OH)
2↓
3, mud pH value reduction curing principle: through unslaked lime handle and dehydration after water ratio be that 20%～30% sludge volume is original 1/2, be fit to the mechanical ramming landfill, but it has strong basicity (PH〉12), to cause the alkaline pollution of waters and soil behind the landfill, so before the mud backfill, must carry out the PH reduction to mud.Mud can produce intensity after taking all factors into consideration the pH value of materialized mud and compacting backfill, and the present invention preferably adopts ammonium hydrogencarbonate (molecular formula: NH
4HCO
3) regulate the pH value of mud, ammonium hydrogencarbonate can with the pH value of effective calcium hydroxide reaction reduction materialized mud in the mud, can also generate the lime carbonate gelling material, make the materialized mud of compacting produce intensity, reach mud PH reduction and solidified effect.Materialized mud volume after overcompaction solidifies can be reduced to original about 60%.Relevant chemical reaction is as follows:
Ca(OH)
2+NH
4HCO
4→CaCO
3↓+NH
3↑+H
2O
Technique effect of the present invention is:
1, the present invention can effectively realize innoxious, the minimizing processing of municipal sludge;
2, the present invention is low with respect to heat drying technology and incineration technology processing cost;
3, the present invention can realize continuous mass disposal;
4, that sludge volume is reduced to is original 30% in the present invention, reduces the landfill area, reduces consumption and destruction to land resources.
5, the present invention can significantly reduce the harm of the heavy metal in the mud to environment.
Description of drawings
Fig. 1 is the process flow sheet of the embodiment of the invention.
Embodiment
Embodiment one:
The urban sludge chemical curing method of present embodiment is as described below:
The water ratio of the municipal sludge of present embodiment is 80%, and the content of heavy metals such as its copper, nickel sees Table 2.The municipal sludge mud cake is transported between mud materialization Wagon for medical treatment through the closed canning cart, pour in the mud hopper, start the worm conveyor of mud hopper bottom, adjusting screw transfer roller motor speed, control mud discharging speed continuously flows in the closed biaxial rneader municipal sludge; Be that metering is delivered to from storage tank in the closed biaxial rneader and the municipal sludge mixing and stirring continuously through the spiral measuring apparatus for 250 calcium lime powder simultaneously with activity index.The add-on of municipal sludge is 5 tons in the closed biaxial rneader, and the add-on of calcium lime powder is 0.35 ton.
The concurrent unboiled water reaction that stirs in stirrer of municipal sludge and calcium lime powder produces about 50 ℃ temperature, can evaporate in the mud part moisture and mud is carried out sterilization, deodorizing, dehydration.Stirring reaction 10-15min.The moisture percentage in sewage sludge that comes out in the stirrer is reduced to about 50%-60%, and stable performance can not produce stench, and after the 1-2 days time of banking up, the part moisture in the mud oozes out from the kapillary of materialized mud, and water ratio further reduces.Change heap airing 7 days with forklift, water ratio is reduced to 20%-30% in the mud.
The mud of water ratio 20-30% is transported to landfill district employing crusher in crushing, make blocky mud dress become particulate state and powdery, ammonium hydrogencarbonate is entered in the double-shaft spiral stirrer and stirs through spiral metering outfit and powdery/granular materialized mud, the amount that joins materialized mud in the double-shaft spiral stirrer is 5 tons, the add-on of ammonium hydrogencarbonate is 0.15 ton, regulate materialized mud pH value to 8.6, stir the back and draw in the landfill district with car, the mechanical ramming landfill.
The no lateral confinement resistance to compression average intensity that the compacting solidification sludge generates is 1.1Mpa.
The detection data of heavy metal see Table 2 in municipal sludge and the solidification sludge:
| Detect content | Mercury | Cadmium | Chromium | Sexavalent chrome | Plumbous | Zinc | Copper | Nickel | Arsenic | PH |
| Primary sludge (mg/kg) | 《0.01 | 《0.01 | 1560 | 80 | 125000 | 7030 | 973 | 《0.1 | ||
| Powdery is handled mud and is soaked 1 day (mg/l) | 《0.000 1 | 《0.001 | 0.07 | 《0.01 | 《0.01 | 33.6 | 0.351 | 8.6 | ||
| Solidification treatment mud soaks 5 days (mg/l) | Do not detect | Do not detect | 0.21 | Do not detect | Do not detect | Do not detect | 33.7 | 0.375 | Do not detect | |
| Leaching yield (%) | 0 | 0 | 0.13 | 0 | 0 | 0 | 4.7 | 0.3 | 0 |
Table 2
" primary sludge " is the municipal sludge before handling in the table 2, " powdery processing mud " adds the reacted mud of ammonium hydrogencarbonate among the embodiment after crusher in crushing, " solidification treatment mud " is to add ammonium hydrogencarbonate reaction back mechanical ramming solidified mud among the embodiment, " leaching yield " contains the per-cent of heavy metal weight ratio to be sample soak 5 days in the solution of 5% sodium-chlor after in heavy metal weight that soaks out and the primary sludge.Immersion process concrete in the present embodiment is as follows: sample 100g, 5% sodium-chlor soak solution 1L, 16h is soaked in concussion (concussion frequency 50HZ), static immersion 8h, powdery is handled the mud immersion and was detected heavy metal content in the soak solution, the heavy metal content that solidification treatment mud successive soaking detected in the soak solution in 5 days in 1 day.
Embodiment two:
The urban sludge chemical curing method of present embodiment is as described below:
The water ratio of the municipal sludge of present embodiment is 80%, and the content of heavy metals such as its copper, nickel sees Table 2.The municipal sludge mud cake is transported between mud materialization Wagon for medical treatment through the closed canning cart, pour in the mud hopper, start the worm conveyor of mud hopper bottom, adjusting screw transfer roller motor speed, control mud discharging speed continuously flows in the closed biaxial rneader municipal sludge; Be that metering is delivered to from storage tank in the closed biaxial rneader and the municipal sludge mixing and stirring continuously through the spiral measuring apparatus respectively for 250 calcium lime powder crystal simultaneously with activity index.The add-on of municipal sludge is 5 tons in the closed biaxial rneader, and the add-on of calcium lime powder is 0.5 ton.
The concurrent unboiled water reaction that stirs in stirrer of municipal sludge and calcium lime powder produces about 50 ℃ temperature, can evaporate in the mud part moisture and mud is carried out sterilization, deodorizing, dehydration.Stirring reaction 10-15min.The moisture percentage in sewage sludge that comes out in the stirrer is reduced to about 50%-60%, and stable performance can not produce stench, and after the 1-2 days time of banking up, the moisture in the mud oozes out from the kapillary of materialized mud, and water ratio further reduces.Change heap airing 7 days with forklift, water ratio is reduced to 20%-30% in the mud.
The mud of water ratio 20-30% is transported to landfill district employing crusher in crushing, make blocky mud dress become particulate state and powdery, ammonium hydrogencarbonate is entered in the double-shaft spiral stirrer and stirs through spiral metering outfit and powdery/granular materialized mud, the amount that joins materialized mud in the double-shaft spiral stirrer is 5 tons, the add-on of ammonium hydrogencarbonate is 0.25 ton, stir the back and draw in the landfill district with car, the mechanical ramming landfill.
The method of the foregoing description is referring to Fig. 1.
Claims (4)
1. a urban sludge chemical curing method is characterized in that comprising the steps:
(1) in municipal sludge, add calcium lime powder, stirring reaction 10-15min, the add-on of calcium lime powder is the 7%-10% of municipal sludge weight;
(2) be 20%-30% with sludge dewatering to water ratio then;
(3) be that the sludge crushing of 20%-30% becomes particulate state and powdery with water ratio, regulate its pH value to 7-9, then the compacting landfill.
2. urban sludge chemical curing method according to claim 1 is characterized in that: described (3) step adopt bank up, airing is or/and the method for oven dry makes sludge dewatering.
3. urban sludge chemical curing method according to claim 1 is characterized in that: adopt ammonium hydrogencarbonate to regulate the pH value of mud in described (3) step, the add-on of ammonium hydrogencarbonate is the 3%-5% of mud weight.
4. urban sludge chemical curing method according to claim 1 is characterized in that: it is the calcium lime powder of 250-300 that described calcium lime powder adopts activity index.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102414966A CN101456662A (en) | 2008-12-24 | 2008-12-24 | Urban sludge chemical curing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102414966A CN101456662A (en) | 2008-12-24 | 2008-12-24 | Urban sludge chemical curing method |
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| Publication Number | Publication Date |
|---|---|
| CN101456662A true CN101456662A (en) | 2009-06-17 |
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ID=40767827
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101805105A (en) * | 2010-04-08 | 2010-08-18 | 宜兴市展宏环保设备有限公司 | Sludge treatment method |
| CN102390915A (en) * | 2011-10-11 | 2012-03-28 | 中国石油天然气集团公司 | Process for curing and dehydrating scum bottom sludge |
| CN102583920A (en) * | 2012-03-12 | 2012-07-18 | 陈启松 | Harmless treatment method for reducing stainless steel leftover sludge at medium temperature |
| CN103641286A (en) * | 2013-12-09 | 2014-03-19 | 沈阳铝镁设计研究院有限公司 | Sludge stabilizing method |
| CN104973749A (en) * | 2015-07-10 | 2015-10-14 | 盐城琛丹低碳技术研究院有限公司 | Sludge solidification method |
| CN106007324A (en) * | 2016-07-06 | 2016-10-12 | 无锡市华东电力设备有限公司 | Solidification and desiccation process of sludge |
| CN106395413A (en) * | 2016-06-22 | 2017-02-15 | 徐州三原环境工程有限公司 | Compost material conveying system |
| CN110029621A (en) * | 2018-01-08 | 2019-07-19 | 常州光标环保科技有限公司 | River bed sludge in-situ processing reuse method |
| CN111333286A (en) * | 2020-03-19 | 2020-06-26 | 大连海事大学 | Method for treating high-water-content sludge in storage yard |
| CN112620294A (en) * | 2020-12-16 | 2021-04-09 | 湖南军信环保股份有限公司 | Landfill disposal method for dewatered sludge |
| CN113248088A (en) * | 2021-06-25 | 2021-08-13 | 浙江工商大学 | Deep dehydration method for sludge and application of sludge |
-
2008
- 2008-12-24 CN CNA2008102414966A patent/CN101456662A/en active Pending
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101805105A (en) * | 2010-04-08 | 2010-08-18 | 宜兴市展宏环保设备有限公司 | Sludge treatment method |
| CN102390915A (en) * | 2011-10-11 | 2012-03-28 | 中国石油天然气集团公司 | Process for curing and dehydrating scum bottom sludge |
| CN102390915B (en) * | 2011-10-11 | 2013-04-24 | 中国石油天然气集团公司 | Process for curing and dehydrating scum bottom sludge |
| CN102583920A (en) * | 2012-03-12 | 2012-07-18 | 陈启松 | Harmless treatment method for reducing stainless steel leftover sludge at medium temperature |
| CN103641286A (en) * | 2013-12-09 | 2014-03-19 | 沈阳铝镁设计研究院有限公司 | Sludge stabilizing method |
| CN103641286B (en) * | 2013-12-09 | 2015-08-19 | 沈阳铝镁设计研究院有限公司 | A kind of method of stabilization mud |
| CN104973749A (en) * | 2015-07-10 | 2015-10-14 | 盐城琛丹低碳技术研究院有限公司 | Sludge solidification method |
| CN104973749B (en) * | 2015-07-10 | 2017-04-12 | 盐城琛丹低碳技术研究院有限公司 | Sludge solidification method |
| CN106395413A (en) * | 2016-06-22 | 2017-02-15 | 徐州三原环境工程有限公司 | Compost material conveying system |
| CN106007324A (en) * | 2016-07-06 | 2016-10-12 | 无锡市华东电力设备有限公司 | Solidification and desiccation process of sludge |
| CN110029621A (en) * | 2018-01-08 | 2019-07-19 | 常州光标环保科技有限公司 | River bed sludge in-situ processing reuse method |
| CN111333286A (en) * | 2020-03-19 | 2020-06-26 | 大连海事大学 | Method for treating high-water-content sludge in storage yard |
| CN111333286B (en) * | 2020-03-19 | 2022-03-01 | 大连海事大学 | Method for treating high-water-content sludge in storage yard |
| CN112620294A (en) * | 2020-12-16 | 2021-04-09 | 湖南军信环保股份有限公司 | Landfill disposal method for dewatered sludge |
| CN112620294B (en) * | 2020-12-16 | 2022-04-08 | 湖南军信环保股份有限公司 | Landfill disposal method for dewatered sludge |
| CN113248088A (en) * | 2021-06-25 | 2021-08-13 | 浙江工商大学 | Deep dehydration method for sludge and application of sludge |
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Open date: 20090617 |