CN104496139A - Pretreatment method of heavy metal sludge - Google Patents
Pretreatment method of heavy metal sludge Download PDFInfo
- Publication number
- CN104496139A CN104496139A CN201510000052.3A CN201510000052A CN104496139A CN 104496139 A CN104496139 A CN 104496139A CN 201510000052 A CN201510000052 A CN 201510000052A CN 104496139 A CN104496139 A CN 104496139A
- Authority
- CN
- China
- Prior art keywords
- mud
- heavy metal
- sludge
- cement
- pretreatment process
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention relates to a pretreatment method of heavy metal sludge. The specific method comprises the following steps: firstly, adjusting the pH of sewage sludge to be 7-9 with slaked lime, and treating with a heavy metal stabilization medicine; adding cement and a flocculating agent, and stirring; finally separating out a lot of water from which metals are removed by virtue of mud-water separation equipment; and naturally drying a mud cake for 1-2 days until the mud cake becomes hard, wherein the moisture content is lower than 40%, the mud cake can be directly subjected to landfill disposal, and the content of heavy metals in the separated sewage accords with the related emission limit in the 'integrated wastewater discharge standard'. Therefore, the method can be used as a pretreatment unit before landfill disposal of high-water sludge and heavy metal-containing sludge.
Description
Technical field
The present invention relates to the dehydration of sewage disposal mud and remove the preconditioning technique of metal.
Background technology
Along with the further quickening of urbanization process, city domestic sewage and the pollution of trade effluent to environment more and more serious, for alleviating water pollution, large, medium and small city, the whole nation starts in a large number and increases Jian Liao sewage work, incident is produce a large amount of mud in sewage treatment process, any stacking of mud is not only taken up an area many, but also can cause secondary pollution.Containing heavy metal people and animals being produced to harm in mud, and heavy metal is different from other pollutent, can not be degraded by Institute of Micro-biology, once enter soil, easily absorbed by crops, and can accumulate in plant materials, produces harm eventually through food chain to people and animals.China to the disposal of sludge containing heavy metal based on sanitary landfill or burn, only to comparatively small amt containing higher being just used of heavy metal.And the easy leaching of the high-moisture percentage of mud and heavy metal, the disposal process that result in heavy metal sewage sludge is very complicated and uneconomical.Obviously, simple landfill stabilization causes percolate to increase, and has increased the weight of the burden of water pollution control equally, and directly burning then will consume a large amount of thermals source.Therefore the safe disposal resolving heavy metal sewage sludge has become a urgent task.
Chinese patent: CN103011544 describes and a kind ofly applies the method that cullet makes deeply dehydrating sludge, and this invention joins glass powder in mud, then is removed by water by extruding, and this method dehydrating effect is good, but needs to consume a large amount of glass powder, and cost is higher; Chinese patent: CN103359899 describes a kind of pretreatment process of deeply dehydrating sludge, and water in mud by adding persulphate, and removes by this method under microwave action, this method needs the microwave by relatively high power, energy consumption is high, and equipment requirements is high, is not too applicable to extensive lignin-sludge; Chinese patent: CN103030259 describes a kind of conditioning dewatering of excess sludge, and water in mud is separated by adding quaternary ammonium cation organism by this method, but this method is carried out in acid condition, easily produces heavy metal ion secondary pollution.
Heavy metal sewage sludge of the present invention is from enterprises such as chemical industry, plating, metallurgical processing and urban wastewater treatment, and for containing one or more sewage disposal mud of heavy metal, water ratio is more than 85%.Its intractability is: be difficult to direct mud-water separation, and needing to add a large amount of amendments can realize; And the heavy metal ions in wastewater be separated exceeds standard, complicated subsequent disposal is needed to discharge; The mud cake be separated still has Leaching, and in leach liquor, heavy metal ion far exceedes relevant criterion limit value in " hazard waste landfill Environmental capacity standard " (GB 18598-2001), and needing could landfill stabilization after stable curing process.
Conventional treatment process:
1) mud modified-Deep dehydration technique:
Mud is modified-and deep dehydration is by utilizing chemical reagent such as adding iron(ic) chloride, ferric sulfate, calcium oxide, magnesium oxide to nurse one's health mud, changing Sludge Property, and then the method for dehydration.The method dehydrating effect is obvious, but does not consider the leaching factors of heavy metal.If adopt this technique to containing the mud of heavy metal, all containing heavy metal in the mud cake after its moisture removed and dehydration.This technique agents useful for same price cement relatively of the present invention is expensive, promotes the restriction being subject to cost.
2) direct lime-cement solidification technique:
Direct lime-cement solidification technique can only be used for processing the relatively low mud of water ratio, and needing first to dewater to the mud of High water cut is cured again; And only cement and lime cannot complete stability heavy metals, the cured body leach liquor often heavy metals exceeding standard of its heavy metal sewage sludge.
3) mummification-burning process:
Mummification-burning and processing sludge can reduce sludge quantity in a large number, is conventional mud.But mummification-burning does not thoroughly solve the problem of Heavy Metal Pollution in Sludge, while mummification-burning, heavy metal is often present in flying dust and incineration residue, and flying dust easily causes secondary pollution, and incineration residue needs further stabilization solidification treatment.And sludge calorific value difference is very large, may not necessarily directly burn, being used for the energy consumption of dewatered sludge also needs a lot.
4) ferri-trickle leaching-mud detoxification technique:
Ferri-trickle leaching-mud detoxification technique is the important process technique for heavy metal sewage sludge, but this technique is difficult to the heavy metal in mud all to leach, sludge heavy-metal exceeds standard and is still difficult to direct landfill, this technique also exists cannot reduce moisture percentage in sewage sludge, need in a large amount of alkali and acidleach mud, leach liquor metal concentration relatively low, be difficult to the problem reclaimed.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind ofly can remove the heavy metal sewage sludge pretreatment process that Heavy Metals in Sludge significantly can reduce again moisture percentage in sewage sludge, while removing heavy metal in waste water, also solving that Heavy Metals in Sludge exceeds standard can not the problem of direct landfill.
The technical scheme realizing the object of the invention is: the present invention includes following steps:
1) heavy metal stabilization, 2) cement mixing, 3) flocculating settling, 4) mud-water separation, 5) mud cake mummification.
A pretreatment process for heavy metal sewage sludge, comprises the following steps:
1) regulate pH, in container, add white lime powder under whipped state, mud and white lime powder are stirred rapidly, the pH value of the mud after adjustment is 7 ~ 9; And backward adjustment pH after material in add heavy metal stabilizer, be stirred well to and mix;
2) cement mixing, adds cement mixing in the material after step 1) heavy metal stabilization under stirring;
4) flocculating settling, to step 2 under stirring) cement mixing after material in add flocculation agent PAM, make the rapid flocculating settling of mud;
5) mud-water separation, the mud after step 3) being flocculated carries out dehydration and is separated;
6) mud cake mummification, by the mud cake nature mummification 1-2 days after step 4) mud-water separation.
Heavy metal sewage sludge described in step 1) is that water ratio is more than 85% containing one or more mud of heavy metal.
Heavy metal stabilizer described in step 1) is sodium sulphite, thiocarbamide, heavy metal chelating agent etc., and the content of the middle heavy metal of the mud that the interpolation weight of medicament is pending to step 1) is relevant.
Step 2) first under agitation terminate to step 1) after mud in add cement, and to stir, the addition of cement and step 2) mass ratio of pending mud is 1: 80-100.
Step 3) is first under agitation to step 2) cement adds in the material after terminating and adds flocculation agent PAM;
Flocculation agent when described PAM concentration is 0.5%, the mass ratio of mud pending in the addition of flocculation agent and step 1) is 1: 100.
Described metal-stabilized medicament is sodium sulphite, thiocarbamide, heavy metal chelating agent etc., and the content of the middle metal making the kind of with medicament and add the weight mud pending to step 1) is relevant.
The present invention, by the effect of heavy metal stabilization medicament, makes it with heavy metal by chemical combination, chelatropic reaction, forms the compound of indissoluble, while removing the heavy metal in waste water, also greatly reduces the leachability of Heavy Metals in Sludge.
It is hydration by cement that the present invention adds cement, improves and enhanced granule structure, thus improves strainability.
The effect that the present invention adds flocculation agent removes surface adsorption water and capillary Bound moisture, and reduce the repulsive interaction between mud granule, flocculated particle becomes rapidly large flocs unit, thus significantly improves strainability.
The present invention has positive effect: this method utilizes metal-precipitator, lime, cement, flocculation agent etc. to carry out heavy metal removing and dehydration to the sewage disposal mud of containing metal, high-moisture, solve well mud containing heavy metals exceeding standard, water ratio are high can not the problem of direct landfill.
The present invention is better than the dehydrating effect directly adding flocculation agent, is below verification msg:
| Former water ratio | Water ratio after direct flocculation dewatering | Water ratio after the inventive method dehydration | Water ratio after the inventive method dehydration and drying | |
| Sample 1 | 95% | 86% | 53% | 42% |
| Sample 2 | 99% | 79% | 47% | 39% |
| Sample 3 | 93% | 76% | 45% | 33% |
The mud of process of the present invention has following features: a, containing plurality of heavy metal: relevant GB measures, and the heavy metal sewage sludge mud that its result shows process of the present invention contains one or more the heavy metal such as arsenic, lead, mercury, copper, nickel, zinc, cadmium; B, water ratio are high: according to analysis, and moisture percentage in sewage sludge is more than 85%, and part reaches 95% even higher.
According to the feature of above-mentioned sewage disposal mud, the present invention first carries out stabilization with metal-precipitator to metal ingredient, and convert metals becomes stable throw out to be collected; According to GB 8978-1996 " integrated wastewater discharge standard ", the pH of sewage effluent must between 6-9, and metal has satisfactory stability effect in the basic conditions, therefore regulates pH to 7 ~ 9 of waste residue with white lime powder; Add cement again after regulating pH to terminate, by the hydration of cement, make it more easily to be flocculated and mud-water separation operation; Pass through the throwing out of flocculation agent again by sludge settling; The water having removed metal is in a large number separated by last mud and water separating equipment; Due to the effect of cement, the mummification of mud cake nature becomes matter after 1 ~ 2 day hard, moisture lower than 40%, can direct landfill stabilization.
Moisture percentage in sewage sludge can be down to less than 50% by fast and low-cost by the present invention; Metal removal rate is more than 99%, finally realizing metal is present in the less mud cake of water ratio with stable form, do not contain in waste water or containing micro-heavy metal, meet " integrated wastewater discharge standard " (heavy metals emission limit value in (GB 8978-1996); Mud cake after process is through leaching characteristic identification, and in leach liquor, heavy metal content meets the relevant limitation standard of heavy metal in GB 18598-2001 " hazard waste landfill Environmental capacity standard ".
Embodiment
Embodiment 1
The mud of the present embodiment process from the sewage disposal company materializing strategy section of certain chemical industrial park, by analysis, moisture percentage in sewage sludge 98%, copper content 84mg/L in the leach liquor that its Leaching is analyzed.
In 500ml mud, adding white lime powder to pH value under whipped state is 8.5, then adds industrial sodium sulfide 1.5g, Keep agitation 3 minutes; Add cement 5g subsequently, continue stirring 5 minutes; Add flocculation agent PAM(0.5% again) 0.5ml, stirs after 2 minutes and leaves standstill, make the rapid flocculation sediment of mud; After vacuum filtration, moisture percentage in sewage sludge 43%, natural mummification is after 2 days, and mud is lump shape, and moisture 36%.
Mud cake detects through Leaching, copper content 1mg/L in mud cake leach liquor, meets the limit value requirement of the heavy metal copper of " hazard waste landfill Environmental capacity standard " (GB 18598-2001).
The Cu in waste water be separated does not detect, and meets the standard limit of heavy metal in " integrated wastewater discharge standard " (GB 8978-1996).
Embodiment 2
The mud of the present embodiment process from certain landfill percolate treatment plant, by analysis, moisture percentage in sewage sludge 90%, its Leaching analyze leach liquor in copper content 57mg/L, Zn content 78mg/L, nickel content 4mg/L.
In 500ml mud, adding white lime powder adjust ph under whipped state is 8.9; Add heavy metal chelant (concentration 15%) 2g again, stir after 3 minutes, add cement 5g, continue stirring 5 minutes; Add flocculation agent PAM0.5ml again, stir 1 minute, make the rapid flocculation sediment of mud; After vacuum filtration, moisture percentage in sewage sludge 49%, natural mummification is after 2 days, and mud is lump shape, and moisture 38%.
Mud cake through Leaching analysis, copper content 1mg/L, Zn content 1.2mg/L in leach liquor, nickel content 0.5mg/L, meets GB 18598-2001 " hazard waste landfill Environmental capacity standard ";
The waste water be separated is through detecting, and copper, zinc do not detect, nickel content 0.1mg/L, meets heavy metal standard limit in " integrated wastewater discharge standard " (GB 8978-1996).
Embodiment 3
The mud of the present embodiment process from certain chemical plant sewage treatment plant, by analysis, moisture percentage in sewage sludge 95%, its Leaching analyze leach liquor in lead content 46mg/L.
After adding dry hydrate under whipped state in 500ml mud, pH value is 7.9; Add industrial thiocarbamide 0.5g again, stir 5 minutes, add cement 5g subsequently, Keep agitation 5 minutes; Add flocculation agent PAM0.5ml again, stir 1 minute, make the rapid flocculation sediment of mud; After vacuum filtration, moisture percentage in sewage sludge 55%, natural mummification is after 2 days, and mud cake is lump shape, and moisture 32%.
Mud cake is through turnover oxicity analysis, and lead content 0.04mg/L in leach liquor, meets " hazard waste landfill Environmental capacity standard " (GB 18598-2001) standard-required.
After testing, lead does not detect the waste water be separated; Meet heavy metal standard limit in " integrated wastewater discharge standard ".
Claims (6)
1. a pretreatment process for heavy metal sewage sludge, is characterized in that, comprises the following steps:
1) heavy metal stabilization, 2) cement mixing, 3) flocculating settling, 4) mud-water separation, 5) mud cake mummification.
2. the pretreatment process of a kind of heavy metal sewage sludge according to claim 1, is characterized in that, comprise the following steps:
1) heavy metal stabilization, adds white lime powder under whipped state in container, and mud and white lime powder are stirred rapidly, and the pH value of the mud after adjustment is 7 ~ 9; In the material after adjustment pH, add heavy metal stabilizer again, be stirred well to and mix;
2) cement mixing, adds cement mixing in the material after step 1) heavy metal stabilization under stirring;
3) flocculating settling, to step 2 under stirring) cement mixing after material in add flocculation agent PAM, make the rapid flocculating settling of mud;
4) mud-water separation, the mud after step 3) being flocculated carries out dehydration and is separated;
5) mud cake mummification, by the mud cake nature mummification 1-2 days after step 4) mud-water separation.
3. the pretreatment process of sewage disposal mud according to claim 1 or 2, is characterized in that: heavy metal sewage sludge described in step 1) is that water ratio is more than 85% containing one or more mud of heavy metal.
4. the pretreatment process of sewage disposal mud according to claim 1 or 2, it is characterized in that: heavy metal stabilizer described in step 1) is sodium sulphite, thiocarbamide, heavy metal chelating agent etc., the content of the middle heavy metal of the mud that the interpolation weight of medicament is pending to step 1) is relevant.
5. the pretreatment process of sewage disposal mud according to claim 1 or 2, it is characterized in that: step 2) first under agitation terminate to step 1) after mud in add cement, and stir, the mass ratio of the addition of cement and the pending mud of step 1) is 1: 80-100.
6. the pretreatment process of sewage disposal mud according to claim 2, is characterized in that: step 3) is first under agitation to step 2) cement adds in the material after terminating and adds flocculation agent PAM;
Flocculation agent when described PAM concentration is 0.5%, the mass ratio of mud pending in the addition of flocculation agent and step 1) is 1: 100.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510000052.3A CN104496139A (en) | 2015-01-01 | 2015-01-01 | Pretreatment method of heavy metal sludge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510000052.3A CN104496139A (en) | 2015-01-01 | 2015-01-01 | Pretreatment method of heavy metal sludge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104496139A true CN104496139A (en) | 2015-04-08 |
Family
ID=52937619
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510000052.3A Pending CN104496139A (en) | 2015-01-01 | 2015-01-01 | Pretreatment method of heavy metal sludge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104496139A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104874581A (en) * | 2015-04-28 | 2015-09-02 | 江苏理工学院 | Stable solidification method of zinc-containing phosphated waste residue |
| CN105174666A (en) * | 2015-07-13 | 2015-12-23 | 华南理工大学 | Carbon-free carbon paper coating wastewater sludge curing method |
| CN106915893A (en) * | 2017-04-28 | 2017-07-04 | 新锦龙生物基材料（湖北）有限公司 | The method and its device of a kind of efficient process sludge dewatering |
| CN110217923A (en) * | 2019-06-20 | 2019-09-10 | 海南宝来工贸有限公司 | A kind of processing method of mixture-metal waste liquid |
| CN111499136A (en) * | 2020-05-14 | 2020-08-07 | 广东华泱技术有限公司 | Innocent treatment method for river and lake sludge |
| CN114262131A (en) * | 2021-12-13 | 2022-04-01 | 江苏旺佳环保工程设备有限公司 | Sludge treatment method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101007699A (en) * | 2007-01-26 | 2007-08-01 | 广州铬德工程有限公司 | Sludge dewatering process |
| CN101628750A (en) * | 2009-09-10 | 2010-01-20 | 南京师范大学 | Sulfide heavy metal chelating agent and preparation method thereof |
| CN101693590A (en) * | 2009-10-12 | 2010-04-14 | 天津生态城环保有限公司 | Heavy metal polluted sludge treatment method |
| CN102584165A (en) * | 2012-02-20 | 2012-07-18 | 天津市环境保护科学研究院 | Curing agent for curing/stabilizing silt (sludge) and soft foundation, and application thereof |
| CN103073166A (en) * | 2013-02-05 | 2013-05-01 | 上海市环境科学研究院 | Method for simultaneously stabilizing heavy metals and deeply dewatering municipal sludge for municipal sludge |
| CN103787558A (en) * | 2012-11-01 | 2014-05-14 | 深圳市海川实业股份有限公司 | Heavy metal stabilizer used for sludge treatment, and method for treating sludge by adopting it |
-
2015
- 2015-01-01 CN CN201510000052.3A patent/CN104496139A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101007699A (en) * | 2007-01-26 | 2007-08-01 | 广州铬德工程有限公司 | Sludge dewatering process |
| CN101628750A (en) * | 2009-09-10 | 2010-01-20 | 南京师范大学 | Sulfide heavy metal chelating agent and preparation method thereof |
| CN101693590A (en) * | 2009-10-12 | 2010-04-14 | 天津生态城环保有限公司 | Heavy metal polluted sludge treatment method |
| CN102584165A (en) * | 2012-02-20 | 2012-07-18 | 天津市环境保护科学研究院 | Curing agent for curing/stabilizing silt (sludge) and soft foundation, and application thereof |
| CN103787558A (en) * | 2012-11-01 | 2014-05-14 | 深圳市海川实业股份有限公司 | Heavy metal stabilizer used for sludge treatment, and method for treating sludge by adopting it |
| CN103073166A (en) * | 2013-02-05 | 2013-05-01 | 上海市环境科学研究院 | Method for simultaneously stabilizing heavy metals and deeply dewatering municipal sludge for municipal sludge |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104874581A (en) * | 2015-04-28 | 2015-09-02 | 江苏理工学院 | Stable solidification method of zinc-containing phosphated waste residue |
| CN104874581B (en) * | 2015-04-28 | 2017-06-13 | 江苏理工学院 | Stable solidification method of zinc-containing phosphated waste residue |
| CN105174666A (en) * | 2015-07-13 | 2015-12-23 | 华南理工大学 | Carbon-free carbon paper coating wastewater sludge curing method |
| CN105174666B (en) * | 2015-07-13 | 2018-02-27 | 华南理工大学 | A kind of curing of NCR coating wastewater sludge |
| CN106915893A (en) * | 2017-04-28 | 2017-07-04 | 新锦龙生物基材料（湖北）有限公司 | The method and its device of a kind of efficient process sludge dewatering |
| CN110217923A (en) * | 2019-06-20 | 2019-09-10 | 海南宝来工贸有限公司 | A kind of processing method of mixture-metal waste liquid |
| CN110217923B (en) * | 2019-06-20 | 2021-11-23 | 海南宝来工贸有限公司 | Treatment method of mixed heavy metal waste liquid |
| CN111499136A (en) * | 2020-05-14 | 2020-08-07 | 广东华泱技术有限公司 | Innocent treatment method for river and lake sludge |
| CN114262131A (en) * | 2021-12-13 | 2022-04-01 | 江苏旺佳环保工程设备有限公司 | Sludge treatment method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107188330B (en) | Method for adsorbing and purifying acidic wastewater | |
| CN104496139A (en) | Pretreatment method of heavy metal sludge | |
| CN102936068A (en) | In-process circular and comprehensive recovery technology for mineral processing wastewater of tin-lead-zinc polymetallic sulphide ores | |
| CN103121763A (en) | Process for treating high-arsenic and high cadmium waste acid by using three-stage lime-ferric salt method | |
| CN108529805B (en) | Treatment method of hazardous waste landfill leachate | |
| CN105858957A (en) | Method for treating polluted water by utilizing solid waste steel slag | |
| CN101786787A (en) | Sludge dewatering integrated process | |
| CN103951114B (en) | A kind of heavy metal wastewater thereby tertiary treatment and deep purifying reuse technology | |
| CN102001734A (en) | Heavy metal settling agent for treating mercury-containing wastewater | |
| CN101973619B (en) | Method for treating waste water from copper smelting by using modified ardealite | |
| CN107473353B (en) | Preparation method of flocculant polyaluminum ferric chloride | |
| CN102583836A (en) | Method for treating copper/lead/zinc ore mining sewage | |
| CN102786133A (en) | Stepwise precipitation process for recovering iron/copper resource in acid mine waste water | |
| CN104445733A (en) | Technology for removing thallium with lead and zinc smelting flue gas washing waste acid water | |
| CN104193043A (en) | Arsenic removing treatment process and method for high-concentration arsenic-containing alkali waste water | |
| CZ2007312A3 (en) | Method of treatment of iron-containing waterworks sludge and a mixture prepared by this method | |
| CN102234161A (en) | Method for treating high-concentration arsenic-containing wastewater | |
| CN110238185A (en) | A kind of repair materials and its restorative procedure of heavy-metal contaminated soil | |
| CN108059301B (en) | Method for recovering heavy metals in heavy metal sewage by using activated sludge | |
| CN104478055B (en) | Sewage disposal complexing agent, its preparation method and methods for using them | |
| CN104986906B (en) | A kind of processing method of dangerous waste percolate | |
| CN103641286A (en) | Sludge stabilizing method | |
| JP2014050841A (en) | Water treatment method | |
| JP2011101830A (en) | Water treatment agent and water treatment method | |
| CN101973589A (en) | Preparation method of polymeric ferric aluminous sulphate by using pyrite wastewater and treatment sludge |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150408 |