CN101791624B - Method for utilizing and disposing micro-electrolyzed waste residue of organic waste water and method for immobilizing arsenic and heavy metal in soil - Google Patents
Method for utilizing and disposing micro-electrolyzed waste residue of organic waste water and method for immobilizing arsenic and heavy metal in soil Download PDFInfo
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Abstract
The invention relates to a method for utilizing and disposing micro-electrolyzed waste residue of organic waste water, a method for immobilizing arsenic and heavy metal in soil and a method for utilizing and disposing micro-electrolyzed waste residue and activated sludge of organic waste water. The invention is characterized in that iron carbon is used as main filler for the micro electrolysis of the organic waste water, the waste residue (solids) produced after the micro electrolysis of the iron carbon is collected, concentrated and mixed with the activated sludge, inorganic/organic mixed restoration agent is prepared after 10-50 days of composting treatment are conducted, the weight of the iron in the restoration agent accounts for (0.5-20) percent of the total weight of the solids, finally deep tillage is conducted to restore the pollution soil after the restoration agent is evenly dispersed in soil, and the weight ratio of the restoration agent to the polluted soil is (0.1-5.0):100.
Description
Technical field:
The invention belongs to the Environmental Technology field, but what relate to is arsenic and heavy metal in a kind of immobilization soil, and the method for micro-electrolyzed waste residue of organic waste water, activated sludge utilization and disposal.This method not only can realize heavy-metal contaminated soil effective reparation, strengthen agriculture safety, and effectively dispose the little electrolytic treatments waste residue of organic wastewater.
Technical background:
Soil is the basis that the important natural resources of human survival and development and whole terrestrial ecosystems are rely and existed, and the improvement of soil pollution is subjected to extensive concern.The pollution sources of soil environment are more more complicated than atmospheric environment and water environment, pollutant of a great variety, comprise traditional chemical pollutant (inorganic pollution and organic pollution), physical pollution thing, biological pollutant and radioactive pollutant, wherein, the most general, serious and complicated with the chemical pollutant of soil.The features of pollution of arsenic and heavy metal (Hg, Cd, Pb, Cu, Zn and Ni etc.) is that the concentration in soil environment is generally lower, to the harm of the ecosystem and bigger to health effects.As Cd is a kind of common heavy metal element, and the activity in soil is stronger, is easy to be absorbed and the contaminated food chain by crop, jeopardizes human health.In the 30-70 age in last century, Toyama County, Japan, group horse county are once with " itai-itai " that occurred one of world-shaking eight big public hazards because of cadmium pollution.Now, the whole world have an appointment every year 1500 ten thousand t manganese, 5,000,000 t are plumbous and 1.5 ten thousand t mercury enter soil.In China, along with the propelling of modernization construction process, the soil pollution problem is serious day by day, at existing 100,000,000 hm that plough
2In nearly 2,000 ten thousand hm are arranged
2Be subjected to pollution in various degree, the annual grain drop in production that causes because of arsenic and heavy-metal contaminated soil reaches ten million ton, and cultivated land resource sustainable use and grain-production safety have been proposed stern challenge.
Since generation nineteen ninety, countries in the world have dropped into great amount of manpower and material resources are carried out the research of contaminated soil, and by for many years exploration and research, people have obtained bigger progress and breakthrough in this field, have developed a series of contaminated soil recovery techniques.According to the difference of action principle, the contaminated soil recovery technique can be divided into technology such as phytoremediation, microorganism reparation and physical/chemical reparation.Phytoremediation be utilize plant self to the absorption of pollutant, fixing, transform and the accumulation function, and be beneficial to microbial degradation and the innoxious process that the environmental condition carry out promotes pollutant of repairing, thereby realize reparation to contaminated soil by providing for rhizosphere microorganism.Microorganism is repaired the repair process that the metabolic process refer to utilize microorganism is converted into the pollutant in the soil innocuous substances such as carbon dioxide, water, aliphatic acid and organism.Existing more patent about phytoremediation and microorganism reparation is characterized in that disposal cost is lower, can reaches higher clean water equality advantage, but all has deficiencies such as length repair time, contaminated thing class limitations.
The physical/chemical reparation is a physico of utilizing pollutant or pollution medium, to destroy (as changing chemical property), separate or to solidify pollutant, have short implementation cycle, can be used for handling advantages such as all contaminations, be divided into original position reparation and dystopy reparation.In-situ chemical is fixing to be exactly by add external source additive fixative in soil, regulate and the physicochemical properties of change heavy metal in soil, make it produce series reaction such as precipitation, absorption, ion-exchange, humification and OR, reduce its biological effectiveness and transportable property in soil environment, thereby reduce these heavy metal elements vegeto-animal toxicity.This restorative procedure is low because of dropping into, repair fast, for low pollute and the solution of the heavy metallic activation problem that the soil acidification aggravation causes has superiority in the large tracts of land that is caused in the agricultural production activity, can satisfy current improvement heavy metal in soil better and pollute and ensure an urgent demand that agricultural product security is produced.
About the chemical fixation reparation of arsenic in the soil and heavy metal has obtained some progress, be mainly reflected in alkaline matter utilization, inorganic clay mineral and debirs and utilize three aspects.The application of alkaline matter such as lime, land plaster etc. mainly is in order to the acid condition of improving the soil, and reduces the leaching of heavy metal with this, for acid ground certain effect is arranged, but the adding of alkaline matter easily makes soil compaction, is difficult to cultivate.Aspect the inorganic clay mineral, patent CN1631561 (heavy-metal contaminated soil original position renovation agent) has invented the soil original position renovation agent that is mixed by sodium bentonite, sepiolite, attapulgite, flyash and microorganism mycorhiza; Patent CN1388206 (nanometer soil-repairing agent and in the application of field crops) has invented the nanometer soil-repairing agent that contains silicate, zeolite and mineral salt.Above patent is having certain effect aspect the soil pollution reparation, but mainly is at some special soil environment, especially improves the effect of chemical fertilizer, improves the physical and chemical performance of soil, improves output and the quality of crop.Aspect debirs utilized, patent CN101036917 (is the method for heavy-metal contaminated soil renovation agent and extracting method and its restoration of soil polluted by heavy metal of raw material with the residual active sludge) was that heavy-metal contaminated soil renovation agent that raw material obtains contains polysaccharide, protein, nucleic acid, phosphoric acid, amino acid, humic acid compound, uronic acid and the cell life required organic matter that circulates with the residual active sludge.Patent CN101045650 (utilizing activated sludge and biomass castoff repairing polluted soil) will be mixed by soil, activated sludge and the biomass castoff of heavy metal pollution, through obtaining compost after the rotten processing of heap, again compost is applied to contaminated soil, the plant of plantation well developed root system is repaired and is subjected to heavy-metal contaminated soil.More than two patents realized both effectively handling and disposing excess sludge, the dual purpose of repairing polluted soil and greening environment again, but the main body of above-mentioned renovation agent is an organic matter is subjected to bigger restriction to the fixed effect of part heavy metal such as Cu, Zn etc. in the soil.
It is multiple because of influencing that the chemosetting effect of arsenic and heavy metal is subjected to edaphic condition and composition, pH, oxidation-reduction potential, cation exchange capacity (CEC) etc. in the soil, repair when simple inorganic renovation agent or organic renovation agent are difficult to realize under the different condition various heavy contaminated soil, therefore open-air repairing effect can exist than big-difference.In order to obtain more stable repairing effect, realize effective control of various heavy contaminated soil, the present invention is with the important component part of iron content inorganic matter as soil-repairing agent, form compound renovation agent with organic waste residues, residual active sludge etc., realized effective reparation of multi-metal contaminated soil.There are some researches show that the iron content inorganic matter is having effect preferably aspect the heavy-metal contaminated soil reparation.For example, be subjected to the Cr contaminated soil under iron and organic matter existence condition, more easily to be reduced to trivalent and to reduce toxicity by sexavalence, Cu in the soil is easy to form the male-female ion complex on the iron hydroxide surface and solidified, and the sulfate of iron has fixed effect preferably to As, or the like.
The most frequently used processing method of solid waste that treatment of Organic Wastewater such as residual active sludge that sanitary sewage disposal produces and micro-electrolyzed waste residue of organic waste water produce is that landfill, burning disposal and water body are dissolved.Landfill takies a large amount of soils, and the gentle cognition of the diffusate that landfill produces is destroyed environment, contaminated air, surface water and underground water; The burning disposal cost is more than 2 times of landfill, generally require sludge calorific value more than 1000kJ/kg, (to be unsuitable for the processing of inorganic content height, little electrolytic waste slag that calorific value is low), and dioxin, the flue dust etc. that contains heavy metal cause atmosphere pollution, and heavy metal also spreads with flue dust in the mud; Water body is dissolved and has been caused surface water and marine environmental pollution.Said method has been subjected to strict restriction in the U.S. and European Union, and in China, existing processing mode mainly is a landfill.Along with China's organic sewage/wastewater treatment ability improves constantly, the mud that produces increases fast, by 2010, only the residual active sludge of sanitary sewage disposal generation just reaches more than 3,000 ten thousand tons, account for more than 5% of China's year total solid waste discharge amount, the development recycling sludge utilizes technology, reduces secondary pollution, is the problem of China and even whole world extensive concern.
Summary of the invention:
The method that provides of the present invention can be carried out chemosetting to arsenic in the contaminated soil and heavy metal, be strengthened agriculture safety.Method of the present invention also can effectively be disposed the little electrolytic treatments waste residue of organic wastewater.Specifically provide a kind of method of utilizing arsenic and heavy metal in little electrolytic treatments waste residue of organic wastewater and the activated sludge fixing soil, utilization and disposal by micro-electrolyzed waste residue of organic waste water, activated sludge realize turning waste into wealth.
The method of micro-electrolyzed waste residue of organic waste water, activated sludge utilization and disposal, may further comprise the steps, the waste residue that organic wastewater produces after by iron-carbon micro-electrolysis is through collecting, mix with activated sludge, but be the soil-repairing agent of arsenic and heavy metal in the immobilization soil again by the solid that made after the compost treatment in 10-50 days, wherein iron content accounts for 0.5～20% of solid quality content.
But method of the present invention has also obtained the soil-repairing agent of arsenic and heavy metal in the immobilization soil.
Described waste residue mixes with activated sludge after concentrating.
Water content is not less than 40% in the mixture that forms after waste residue mixes with activated sludge; Compost adopts the static-stack rot mode with the later stage early stage, and temperature is carried out the stirring processing in the compost heap in mid-term in the time of 40-90 ℃.
Solid after 10-50 days compost treatment is directly used, or by dry, pulverize with the packing back and use, or by dry, pulverize the back and other fertilizer uses in the lump; Described activated sludge comprises residual active sludge that sanitary sewage disposal produces, organic wastewater is handled the residual active sludge that produces by residual active sludge or aerobic biochemical that the anaerobic-aerobic biochemical treatment produces.
The process of described organic wastewater iron-carbon micro-electrolysis is: with the pH value is 1.5～8.0 organic wastewater post, tower or the pond through filler is housed, and the water outlet and the backwashing water that carry out after little electrolysis are regulated pH to 6.5～12, enter the waste residue collector unit and collect waste residue; Filler comprises iron, charcoal and catalyst; Wherein, iron: carbon: catalyst=1: 0.3～1.5: 0.00～0.5; PH regulates the sour preferably sulfuric acid that is adopted, the preferred lime of alkali, NaOH.
It is iron filings, wood shavings iron, carbon steel or the cast iron of 0.5～100mm that described iron adopts particle diameter; Carbon is activated carbon, coke, bamboo carbon or charcoal, particle diameter 1～100mm; Catalyst comprises iron and manganese oxides, copper, cation-modified zeolite or cationic ion-exchange resin.
It is to collect by precipitation, filtration, flocculation or little flocculation mode that described waste residue collector unit is collected waste residue; Waste residue concentrates and adopts plate and frame filter press, belt filter press or centrifugal treating.
Use that the method for arsenic and heavy metal is in the immobilization soil of described renovation agent, add described renovation agent according to heavy metal-polluted soil major pollutants and content characteristics, in the renovation agent of butt and soil quality than being (0.1～-5.0): 100; But soil quality is meant the gross mass of the agricultural soil that target upper soll layer 30cm is thick; Deep plough after adding fashionable employing uniformly dispersing, plant crops, grass or other plant then.
The method of arsenic and heavy metal has following flow process in the micro-electrolyzed waste residue of organic waste water immobilization soil of the present invention:
All kinds of organic wastewaters are through pipe, canal, collections such as ditch, through 1. iron-carbon micro-electrolysis, to improve the biodegradability of organic wastewater with difficult degradation thereby, part reduces the COD concentration of waste water, water outlet enters 2. iron-carbon micro-electrolysis after pH regulates, iron-carbon micro-electrolysis waste residue (solid content) is collected and concentrated, with results organic matter wherein, most of colloid and iron content inorganic matter, then 3. iron-carbon micro-electrolysis waste residue and activated sludge be mixed into the fertile Processing of Preparation of windrow inorganic/organic renovation agent that mixes, so that organic matter degradation wherein, and obtain more rich polysaccharide, nucleic acid, the capable humic acid compound of amino acid, be suitable for soil remediation, be that 4. contaminated soil is repaired the unit at last, according to the heavy metal pollution of soil feature, with the imposing in the soil of renovation agent, carry out soil remediation by a certain percentage.
The iron-carbon micro-electrolysis unit can adopt the form in post, tower or pond, and filler can add little amount of catalyst based on iron carbon.Wherein, packing quality ratio, iron: carbon: catalyst=1: (0.3～1.5): (0.00～0.5); The waste water that enters the iron-carbon micro-electrolysis unit needs to regulate pH value scope 1.5-8.0 through pH; It is iron filings, wood shavings iron, various model carbon steel and the cast iron etc. of (0.5～100) mm that iron adopts particle diameter; Carbon can be activated carbon, coke, bamboo carbon and charcoal, particle diameter (1～100) mm; Catalyst comprises iron and manganese oxides, copper, cation-modified zeolite, cationic ion-exchange resin etc.
Iron-carbon micro-electrolysis water outlet and backwashing water enter the waste residue collector unit after pH regulates.PH value adjustable range is 6.5～12; The acquisition of iron-carbon micro-electrolysis slag can be passed through modes such as precipitation, filtration, flocculation or little flocculation; The waste residue thickening can be adopted plate and frame filter press, mode such as centrifugal, or adopts other concentrated means to handle.It is general industry acid, alkali that pH regulates the acid, the alkali that adopt, wherein sour preferably sulfuric acid, the preferred lime of alkali, NaOH.
The iron-carbon micro-electrolysis waste residue of compost evenly mixes with activated sludge, and mixed proportion determines according to iron content in the iron-carbon micro-electrolysis waste residue, requires generally that water content is greater than 40% in the mixture, and iron content accounts for (0.5-20) % of total solid substance content; Adopt static-stack rot method with the later stage (3-10 days) compost early stage (3-21 days), and temperature is carried out stirring, 10-50 days compost total time in the mid-term heap when (40-90) ℃.The compost that obtains can directly use, and also can use by drying, pulverizing and packing back.The compost that obtains can directly use, and also can use by drying, pulverizing and packing back, also can use with all kinds of fertilizer.
The unit is repaired in soil pollution, adds renovation agent of the present invention according to heavy metal-polluted soil major pollutants and content characteristics, adds ratio and be renovation agent (butt) and soil quality than (0.1-5.0): 100; But soil quality refers generally to the gross mass of the thick agricultural soil of target upper soll layer 30cm; The adding method is deep ploughed after adopting uniformly dispersing, plants crops, grass or other plant then.
Can reach and have following multiple technique effect by using product of the present invention and method:
By arsenic and heavy metal in the waste residue immobilization soil that utilizes the little electrolytic treatments of organic wastewater, prevent from that heavy metal from moving to enter in the plant in soil, thereby reduce the biological effectiveness of plant heavy metal, prevent that fundamentally heavy metal from entering food chain.Micro-electrolyzed waste residue of organic waste water is the complex of iron content inorganic matter and organic active mud, in iron wherein, sulfate and the mud multiple organic matter not only can with the various heavy effect, organic matter in the activated sludge has absorption and complexing fixed function, and to improving soil texture and performance.
Further be, raw material sources of the present invention are typical refuse reclamations in the discarded object of wastewater treatment, not only can realize heavy-metal contaminated soil effective reparation, strengthen agriculture safety, and effectively dispose the little electrolytic treatments waste residue of organic wastewater.The method of the present invention and product process equipment is simple, cost is low, be suitable for execute-in-place, the arsenic in the curing soil and heavy metal is effective, the improvement time short simultaneously, and advantages such as secondary pollution do not appear, be the development environmental protection requirement that meets present technology and technology, represented a kind of new development of technology.Technique effect of the present invention sees embodiment 1-3 for details.
The specific embodiment:
Below in conjunction with experimental study embodiment effect of the present invention is further described.Embodiment 1-3, arsenic and heavy metal are constituent content analysis in the aqueous solution at first through being leached to the aqueous solution then in the soil.Sample leaches and adopts " solid waste leaches toxicity leaching method sulfuric acid nitrate method (HJ/T299-2007) ", and the relevant criterion that elementary analysis is measured GB/T15555-1995 according to nuisance in the solid waste leachate in the aqueous solution is carried out.
Embodiment 1
Laboratory preparation pedotheque is repaired implementation step.
1. organic wastewater iron-carbon micro-electrolysis waste residue: have waste water to adopt the concentrated sulfuric acid to regulate pH=3.0, use iron: carbon ratio is that 2: 1 catalysis iron-carbon micro-electrolysis post is handled, time of staying 1.0h, the milk of lime of iron-carbon micro-electrolysis post effluent adopting 10% is regulated pH and is entered rectangular sedimentation tank after 9.0, and the sedimentation basin time of staying is got 1.5h.Waste residue adopts the suction filtration mode to concentrate.
2. renovation agent preparation: the residual active sludge that sanitary sewage disposal is produced mixes by mass ratio with organic wastewater iron-carbon micro-electrolysis waste residue at 3: 1, carries out compost treatment, 28 days compost time, obtains renovation agent.
3. soil pollution reparation: get nonirrigated farmland soil, analyze wherein water content, press doubly mixing behind the interpolation heavy metal DDGS to 40kg soil (butt) in of soil environment quality standard 0.5-2.0 then, add water to soil moisture content 45; Get wherein 20kg soil, add the above-mentioned renovation agent of 0.40kg (butt) back mixing, 20kg soil does not add renovation agent in addition; Behind the fortnight, divide sampling 500g, adopt the sulfuric acid nitrate method simultaneously soil to be leached, obtain to repair each constituent content in the forward and backward soil respectively by analyzing leachate to not adding with the soil that adds renovation agent.
Embodiment 2
Certain lead-zinc ore tailings storehouse leakage water contaminated soil is repaired implementation step.
Laboratory preparation pedotheque is repaired implementation step.
1. organic wastewater iron-carbon micro-electrolysis waste residue: have waste water to adopt 5% sulfuric acid solution to regulate wastewater pH=4.0, use iron: carbon: the catalyst ratio is that 2: 1: 0.02 catalysis iron-carbon micro-electrolysis post is handled, time of staying 1.5h, it is the 10.0 little flocculations in back that the milk of lime of iron-carbon micro-electrolysis post effluent adopting 5% is regulated pH, and waste residue adopts plate and frame filter press to concentrate.
2. renovation agent preparation: the residual active sludge that organic wastewater anaerobic-aerobic (A/O) biochemical treatment is produced mixes by mass ratio with organic wastewater iron-carbon micro-electrolysis waste residue at 2: 1, carries out compost treatment, 32 days compost time, obtains renovation agent.
3. soil pollution reparation: get nonirrigated farmland soil 40kg, add water to soil moisture content 45; 20kg soil wherein adds mixing behind the above-mentioned renovation agent of 0.15kg, and 20kg soil does not add renovation agent in addition; Other extractions and analytical procedure are with embodiment 1.
Embodiment 3
Xiang River limit, yellow tea mountain range, Hengyang paddy soils is repaired implementation step.
1. organic wastewater iron-carbon micro-electrolysis waste residue: with embodiment 1.
2. renovation agent preparation: with embodiment 1.
3. soil pollution reparation: water intaking field soil 40kg, wherein 20kg soil adds mixing behind the 0.30kg renovation agent, and 20kg soil does not add renovation agent in addition, and both all add water to saturated; Other extractions and analytical procedure are with embodiment 1.
Table 1 is an analysis result before and after embodiment 1～3 soil remediation.
Effect mg/kg before and after table 1 soil remediation
*pH＝6.5-7.5
Claims (8)
1. the method for micro-electrolyzed waste residue of organic waste water utilization and disposal, it is characterized in that, may further comprise the steps: the waste residue that produces behind the organic wastewater iron-carbon micro-electrolysis is through collecting, mix with activated sludge, be the soil-repairing agent of arsenic and heavy metal in the fixing soil again by the solid that made after the compost treatment in 10～50 days, wherein iron content accounts for 0.5～20% of solid quality content; Compost adopts the static-stack rot mode with the later stage early stage, and temperature is carried out the stirring processing in the compost heap in mid-term in the time of 40～90 ℃; Described waste residue mixes with activated sludge after concentrating, and water content is not less than 40% in the mixture that forms after waste residue mixes with activated sludge; The process of described organic wastewater iron-carbon micro-electrolysis is: with the pH value is 1.5～8.0 organic wastewater post, tower or the pond through filler is housed, and the water outlet and the backwashing water that carry out after little electrolysis are regulated pH to 6.5～12, enter the waste residue collector unit and collect waste residue; Filler comprises iron, carbon and catalyst; Wherein, iron: carbon: catalyst=1: 0.3～1.5: 0～0.5; It is sulfuric acid that pH regulates the acid of being adopted, and alkali is lime or NaOH.
2. the method for utilization according to claim 1 and disposal, it is characterized in that described activated sludge comprises residual active sludge that sanitary sewage disposal produces, organic wastewater is handled the residual active sludge that produces by residual active sludge or aerobic biochemical that the anaerobic-aerobic biochemical treatment produces.
3. the method for utilization according to claim 1 and disposal is characterized in that, the solid after 10～50 days compost treatment is directly used, or by dry, pulverize with the packing back and use, or by dry, pulverize the back and other fertilizer uses in the lump.
4. the method for utilization according to claim 1 and disposal is characterized in that, it is iron filings, wood shavings iron, carbon steel or the cast iron of 0.5～100mm that described iron adopts particle diameter; Carbon is activated carbon, coke, bamboo charcoal or charcoal, particle diameter 1～100mm; Catalyst comprises iron and manganese oxides, copper, cation-modified zeolite or cationic ion-exchange resin.
5. the method for utilization according to claim 1 and disposal is characterized in that, it is to collect by precipitation, filtration, flocculation or little flocculation mode that described waste residue collector unit is collected waste residue; Waste residue concentrates and adopts plate and frame filter press, belt filter press or centrifugal treating.
6. the soil-repairing agent of arsenic and heavy metal in the fixing soil is characterized in that, is prepared by the described method of claim 1.
7. renovation agent according to claim 6, it is characterized in that described activated sludge comprises residual active sludge that sanitary sewage disposal produces, organic wastewater is handled the residual active sludge that produces by residual active sludge or aerobic biochemical that the anaerobic-aerobic biochemical treatment produces.
8. application rights requires the method for arsenic and heavy metal in the 6 described renovation agent fixing soils, it is characterized in that, adding described renovation agent according to heavy metal-polluted soil major pollutants and content characteristics, is 0.1～5.0: 100 in the renovation agent and the soil quality ratio of butt; But soil quality is meant the gross mass of the agricultural soil that target upper soll layer 30cm is thick; Deep plough after adding fashionable employing uniformly dispersing, plant crops, grass or other plant then.
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| CN104275344A (en) * | 2013-07-05 | 2015-01-14 | 中环循(北京)环境技术中心 | Micro-explosion soil remediation method |
| CN103551378B (en) * | 2013-11-20 | 2015-06-24 | 华北电力大学 | Combined microwave oxidation compound repair system and method aiming at organic arsenic pollution in soil |
| CN104150992B (en) * | 2014-07-11 | 2016-08-24 | 徐州承启生物科技有限公司 | Rotten plant microorganism is utilized to realize the method and device of organic wastewater liquid compost |
| CN105253962A (en) * | 2015-10-09 | 2016-01-20 | 昆明理工大学 | Preparation method and application of arsenic removal agent |
| CN105945056B (en) * | 2016-05-30 | 2021-01-05 | 青岛理工大学 | Heavy pollution site Cd in-situ and ex-situ coupling detoxification method based on biogas residues |
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| CN105945065B (en) * | 2016-05-30 | 2020-11-13 | 青岛理工大学 | Heavily-polluted site Cu in-situ and ex-situ coupling detoxification method based on biogas residues |
| CN112122322B (en) * | 2020-09-09 | 2022-04-19 | 季丹萍 | Contaminated soil fertility-increasing and repairing system and treatment process |
| CN115532813A (en) * | 2022-10-17 | 2022-12-30 | 扬州弘思百佳科技有限公司 | Method for restoring heavy metal contaminated soil by taking residual activated sludge as raw material |
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