CN106630494A - Method for removing pollutant in cadmium-containing sewage - Google Patents

Method for removing pollutant in cadmium-containing sewage Download PDF

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CN106630494A
CN106630494A CN201710061968.9A CN201710061968A CN106630494A CN 106630494 A CN106630494 A CN 106630494A CN 201710061968 A CN201710061968 A CN 201710061968A CN 106630494 A CN106630494 A CN 106630494A
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liquid
parts
solid
sewage
phanerochaete chrysosporium
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CN106630494B (en
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李娜
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Liu Xingquan
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
    • C02F3/348—Biological treatment of water, waste water, or sewage characterised by the microorganisms used characterised by the way or the form in which the microorganisms are added or dosed
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
    • C07K14/195—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from bacteria
    • C07K14/21—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from bacteria from Pseudomonadaceae (F)
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
    • C12N1/14—Fungi; Culture media therefor
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
    • C12N1/20—Bacteria; Culture media therefor
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F2001/007—Processes including a sedimentation step
    • 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
    • C02F2101/101—Sulfur compounds
    • 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
    • C02F2101/105—Phosphorus compounds
    • 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
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/06—Controlling or monitoring parameters in water treatment pH
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/24—Separation of coarse particles, e.g. by using sieves or screens

Abstract

The invention relates to a method for removing a pollutant in cadmium-containing sewage. The method comprises the following steps of first making the sewage go through a solid-liquid separator, carrying out solid-liquid separation, so as to remove a massive solid particulate matter, subsequently, making liquid enter a settling tank, settling the liquid for 12 hours, then making the liquid pass through a circular-hole filter screen to remove solid floccules, making the liquid filtered through the circular-hole filter screen enter a biological reaction tank, regulating PH (Potential of Hydrogen) to be 7, dosing 10 grams of compound microbial inoculum into every cubic meter of the liquid each time, dosing the compound microbial inoculum once a day, continuously dosing the compound microbial inoculum for one week, finally, standing obtained liquid for 3 days, and discharging the liquid. By using the method provided by the invention, the pollutant containing ammonia, nitrogen, sulfur, phosphorus and cadmium can be effectively removed; moreover, the input cost is low; the method has a better application prospect.

Description

It is a kind of to remove the method containing cadmium wastewater pollutants
Technical field
The invention belongs to environmental technology field, and in particular to a kind of method of removal dirt water pollutant.
Background technology
Along with industrial development and the improvement of people's living standards, trade effluent amount and city domestic sewage Amount just surges with surprising rapidity, these sewage or or has polluted river for the survival of mankind, river and lake, structure One of the reason for environment for human survival being assisted into prestige.
In order to meet continuous improvement of the public to environmental quality requirement, country has worked out increasingly stricter discharge mark to nitrogen Standard, research and development are economical, efficiently denitrogenate treatment technology has become the emphasis and focus of Water Pollution Control Engineering area research.Though So there are many methods effectively to remove ammonia, such as physical method has counter-infiltration, distillation, soil irrigation；Chemical method has ion to hand over Change method, ammonia aeration, chemical precipitation method, breakpoint chlorination, electrodialysis, electrochemical treatments, catalytic pyrolysis；Biological method has nitrification and algae Class is cultivated, but physical method treatment effect is not good, and than chemical method, biological method processes waste water and has the following advantages:1) it is every kind of The very strong product of being both for property of chemical article, failure is possible to when other chemical substances are run into, and biologic product is to dirt The removal of dye thing has light spectrality；2) chemical products can temporarily eliminate some harmful substances and cover stink, and lacking to hinder The only generation of harmful substance；3) after using chemical products, residual is had in water body, secondary pollution may be caused.Biologic product institute Containing natural microbial, without pathogenic bacteria and pathogen, these microorganisms under the catalytic action of enzyme, with the organic nutrition in sewage Material is food, and after sewage is purified, these microbes are gradually decreased with the reduction of pollutant, until withering away；4) Nontoxic, non-corrosiveness is easy to use, and equipment or engineering need not be added substantially, saves fund input.
Sewage mainly has sanitary sewage and industrial wastewater.Trade effluent comparison of ingredients is complicated, particularly substantial amounts of artificial conjunction Environment is entered into compound, this kind of material is mainly ammonia nitrogen class, sulfide and phosphorus-containing compound, due to these materials knot itself The complexity of structure, can not be decomposed by the microorganisms at short notice utilization, and traditional method of wastewater treatment is tamed and dociled with activated sludge culture The microorganism of change effectively can not be removed to these pollutants, and these materials are accumulated in the environment for a long time, be relied to us Very big pollution is caused with the ecological environment survived, the physical and mental health for giving people class brings very big harm.Quite a few industry of China Contaminating enterprises would rather be punished also be unwilling to invest and administer waste water, even if there is sewage-treatment plant operation also abnormal.Therefore, open Sending out a kind of, construction investment is few, operating cost is low, good treatment efficiency sewage disposal technology is extremely urgent.
The content of the invention
In order to overcome the deficiencies in the prior art, effectively simply remove ammonia nitrogen sulphur phosphorus and heavy metal in sewage etc. and pollute Thing, the invention provides a kind of method for removing dirty water pollutant, its technical scheme is realized by the following method:
A kind of to remove the method containing cadmium wastewater pollutants, it comprises the steps:
The preparation of composite bacteria agent:By mixed bacteria liquid and carrier according to 1:1 weight stirs than mixing, then stands 6 Hour, it is most rearmounted 4 DEG C at low temperature drying, be dried after water content control 6%, obtain final product；The carrier by bamboo charcoal, shitosan and Diatomite is according to 2:2:1 mass ratio is mixed to get, particle diameter preferably 10 mesh of bamboo charcoal；
Sewage treatment step:First by sewage through solid-liquid separator, separation of solid and liquid is carried out, remove bulk solid particulate matter Matter, subsequent liquid enters sedimentation basin, precipitates 12 hours, then liquid is removed into solid floccules, circular hole mistake by circular hole screen pack The Circularhole diameter of filter screen be 0.1mm, biological oxidation:The liquid of Jing circular hole screen packs enters biological reaction pool, and it is 7 to adjust pH, is pressed Every cubic metre of liquid adds every time 10 grams of composite bacteria agent, adds daily 1 time, continuously adds one week, finally 3 days is stood, by liquid Discharge.
Preferably, the composite bacteria agent is mixed by the raw material bacterium of following weight portion:
10 parts of Rhodococcus sp, 9 parts of thiobacillus denitrificans, 7 parts of Pseudomonas stutzeri, 6 parts of Sphingol single-cell, bacillus pumilus 5 parts, 2 parts of Phanerochaete chrysosporium；The concentration of above-mentioned each raw material bacterium is controlled in (1-2) × 108Individual/ml.Above-mentioned bacterial classification can be with It is the conventional bacterial strain of prior art；
Preferably,
The Rhodococcus sp is Rhodococcus sp (Rhodococcusrhodochrous) ATCC15906；
The thiobacillus denitrificans are thiobacillus denitrificans (Thiobacillus denitrificans) ATCC25259；
The Pseudomonas stutzeri is Pseudomonas stutzeri (Pseudomonas stutzeri) CCTCC NO:M209107；
The Sphingol single-cell is Sphingol single-cell (Sphingomonas sp.) CGMCC N0.4589；
The bacillus pumilus is bacillus pumilus (Bacillus pumilus) ATCC27142；
The Phanerochaete chrysosporium is Phanerochaete chrysosporium (Phanerochaete chrysosporium) ATCC24725。
Bacterium of the present invention can be from the business such as CGMCC, CCTCC and American Type Culture collection warehousing (ATCC) Approach is commercially available.
Preferably, described Phanerochaete chrysosporium is the encoding gene for having proceeded to following any one protein variant of coding Phanerochaete chrysosporium (Phanerochaete chrysosporium) bacterial strains of ATCC 24725, the protein variant is relative In albumen original amino acid be mutated as follows respectively 71S/T, 89T/Y, 121T/A, 143D/S, 184S/Q, 239W/G, 246V/P, 269K/N, 304P/S, 353K/E, 369G/D, 372C/S, 422D/R, 448G/I, albumen original amino acid ginseng See GenBank：NP_744955.1.
Present invention simultaneously provides a kind of transgenic strain for being capable of efficient absorption cadmium, the bacterial strain by by amino acid sequence such as Genbank：Sequence shown in NP_744955.1 is imported to and realize in Phanerochaete chrysosporium its purpose.
And described amino acid sequence can have a mutation in following different sites, 71S/T, 89T/Y, 121T/A, 143D/S、184S/Q、239W/G、246V/P、269K/N、304P/S、353K/E、369G/D、372C/S、422D/R、448G/I。 (71S/T represents that the S amino acid substitutions in original series the 71st are T amino acid).Amino acid sequence after these mutation is not grudged The bacterial strain for having imported the amino acid sequence after the mutation equally has similar effect.And applicant is by substantial amounts of experiment card Real, not all replacing all have similar effect, there is Phanerochaete chrysosporium and other bacterium after substantial amounts of replacement Strain does not have together the effect of preferable sewage disposal.
Using DNAMAN software Design primers, BamHI and SalI restriction enzyme sites are separately added into, according to amino acid sequence The described nucleotide sequence HP genes of NP_744955.1 full genomes synthesis, by carrying out amplification purpose fragment, PCR amplifications are obtained Acquisition genes of interest HP (while corresponding mutational site is incorporated in gene order by multiplex PCR, so as to obtain difference Mutant gene), double digestion PCR primer is carried out with BamHI and SalI, with the expression for also passing through BamHI and SalI double digestions Carrier PWB980 is connected, and the recombinant plasmid transformed being proved to be successful is entered in the Phanerochaete chrysosporium, obtains degraded cadmium Genetic engineering bacterium.
The Amplification Culture of each bacterial classification of the present invention is the cellar culture mode of this area, it is also possible to described in reference literature Training method obtain.
What the present invention was obtained mainly has the beneficial effect that:The present invention processes sewage using pure microbial inoculum, has effectively purified dirt Water, and dephosphorization, denitrogenation removal simultaneously, the heavy metal cadmium that can remove sewage Central China simultaneously on this basis solves traditional work Dephosphorization and denitrification effect are difficult to while take into account the contradiction of heavy metals removal in skill, with preferable application prospect.
Specific embodiment
Embodiment 1
A kind of method for removing dirty water pollutant, it comprises the steps:
The preparation of composite bacteria agent:By mixed bacteria liquid and carrier according to 1:1 weight stirs than mixing, then stands 6 Hour, it is most rearmounted 4 DEG C at low temperature drying, be dried after water content control 6%, obtain final product；Carrier is by bamboo charcoal, shitosan and diatom Soil is according to 2:2:1 mass ratio is mixed to get；Above-mentioned mixed bacteria liquid is mixed by the raw material bacterium of following weight portion:Rhodococcus sp 10 parts, 9 parts of thiobacillus denitrificans, 7 parts of Pseudomonas stutzeri, 6 parts of Sphingol single-cell, 5 parts of bacillus pumilus, yellow archespore hair is put down 2 parts of lead fungi；The concentration of above-mentioned each raw material bacterium is controlled 1 × 108Individual/ml.
Sewage disinfection treatment:First by sewage (NH3-N is 300mg/L, sulfide 80mg/L, is 70mg/L containing phosphor contaminant, Cadmium content is 40mg/ml, through solid-liquid separator, carries out separation of solid and liquid, removes bulk solid particulate matter, and subsequent liquid is entered Sedimentation basin, precipitates 12 hours, then liquid is removed into solid floccules by circular hole screen pack, and the Circularhole diameter of circular hole screen pack is 0.1mm；
Biological oxidation:The liquid of Jing circular hole screen packs enters biological reaction pool, and it is 7.0 to adjust pH, by every cubic metre of liquid 10 grams of composite bacteria agent being added every time, being added I time daily, continuously added one week, finally stand 3 days, liquid is discharged.After testing, The content of ammonia nitrogen in sewage is respectively 12.5mg/L, sulfide 4.5mg/L, is 2.5mg/L containing phosphor contaminant, and clearance reaches More than 95%；And cadmium content is 37mg/mL, removal effect is not notable.
Embodiment 2
Using DNAMAN software Design primers, BamHI and SalI restriction enzyme sites are separately added into, according to amino acid sequence The described nucleotide sequence HP genes of NP_744955.1 full genomes synthesis, by carrying out amplification purpose fragment, PCR amplifications are obtained Genes of interest HP is obtained (while passing through multiplex PCR by corresponding mutational site 71S/T, 89T/Y, 121T/A, 143D/S, 184S/ Q, 239W/G, 246V/P, 269K/N, 304P/S, 353K/E, 369G/D, 372C/S, 422D/R, 448G/I are incorporated into gene sequence In row, so as to obtain different mutants gene), double digestion PCR primer is carried out with BamHI and SalI, and also pass through BamHI It is connected with the cloning vector PWB980 of SalI double digestions, the recombinant plasmid transformed being proved to be successful is entered into into the yellow archespore In flat lead fungi (Phanerochaete chrysosporium) ATCC24725 of hair, the genetic engineering bacterium of degraded cadmium is obtained.
The Phanerochaete chrysosporium genetic engineering bacterium of embodiment 3 is verified with the wastewater treatment efficiency of remaining several microbial inoculum
According to the method for embodiment 1, corresponding sewage disposal experiment is carried out, its sewage belongs to same with the sewage of embodiment 1 One batch, the pollutant levels with same concentrations.The each group of wherein microbial inoculum is grouped into identical with embodiment 1.
The genetic engineering bacterium that the different mutational site of the acquisition of embodiment 2 is respectively adopted is removed the reaction of cadmium, passes through Experiment find, 71S/T, 89T/Y, 121T/A, 143D/S, 184S/Q, 239W/G, 246V/P, 269K/N, 304P/S, 353K/E, 369G/D, 372C/S, 422D/R, 448G/I this several mutant bacteria all have and have the effect being remarkably reinforced relative to original bacteria. It is not more than total processing time 4 days, its result is as follows：Sewage is with a collection of sewage, so as to guaranteed conditions are consistent.
Each pollutant levels of sewage：NH3-N is 300mg/L, sulfide 80mg/L, is 70mg/L containing phosphor contaminant, cadmium Content is 40mg/ml.
As can be seen from the above results, the Phanerochaete chrysosporium for being built using genetic engineering is constituted with other several bacterial strains Microbial inoculum in addition to the original preferable effect for removing ammonia nitrogen, sulfide and phosphorus, also with preferably removing cadmium Effect, and in terms of ammonia nitrogen, sulfide and phosphorus is removed engineered Phanerochaete chrysosporium and other several bacterial strains it Between also have enhanced synergy.

Claims (4)

1. a kind of to remove the method containing cadmium wastewater pollutants, it comprises the steps:First by sewage through solid-liquid separator, enter Row separation of solid and liquid, removes bulk solid particulate matter, and subsequent liquid enters sedimentation basin, precipitates 12 hours, then by liquid by circle Hole screen pack removes solid floccules, and the liquid of Jing circular hole filter screen filtrations enters biological reaction pool, and it is 7 to adjust PH, by often standing Square rice liquid adds every time 10 grams of composite bacteria agent, adds daily 1 time, continuously adds one week, finally stands 3 days, and liquid is discharged.
2. the method for claim 1, it is characterised in that：The composite bacteria agent is by the raw material bacterium mixing of following weight portion Into:10 parts of Rhodococcus sp, 9 parts of thiobacillus denitrificans, 7 parts of Pseudomonas stutzeri, 6 parts of Sphingol single-cell, 5 parts of bacillus pumilus, 2 parts of Phanerochaete chrysosporium；The concentration of above-mentioned each raw material bacterium is controlled in (1-2) × 108Individual/ml.
3. method as claimed in claim 2, it is characterised in that：Described Phanerochaete chrysosporium is as follows to have proceeded to coding Phanerochaete chrysosporium (Phanerochaete chrysosporium) bacterium of ATCC 24725 of the encoding gene of protein variant Strain, the protein variant is to be mutated as follows relative to albumen original amino acid:246V/P, albumen Original amino Sequence is referring to GenBank：NP_744955.1.
4. a kind of protein variant, it is characterised in that：The protein variant be carry out relative to albumen original amino acid it is as follows Mutation:246V/P, albumen original amino acid is referring to GenBank：NP_744955.1.
CN201710061968.9A 2015-07-26 2015-07-26 Method for removing cadmium-containing sewage pollutants Expired - Fee Related CN106630494B (en)

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CN201710061958.5A Pending CN106517701A (en) 2015-07-26 2015-07-26 Method for removing pollutants in cadmium-containing sewage
CN201710061962.1A Active CN106630491B (en) 2015-07-26 2015-07-26 Method for removing cadmium-containing sewage pollutants
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CN201710061966.XA Pending CN106630492A (en) 2015-07-26 2015-07-26 Method for removing pollutant in cadmium-containing sewage
CN201710061963.6A Active CN106745817B (en) 2015-07-26 2015-07-26 Method for removing cadmium-containing sewage pollutants
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CN201710061945.8A Active CN106630488B (en) 2015-07-26 2015-07-26 Method for removing cadmium-containing sewage pollutants
CN201710061971.0A Active CN106630495B (en) 2015-07-26 2015-07-26 Method for removing cadmium-containing sewage pollutants
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CN201710061958.5A Pending CN106517701A (en) 2015-07-26 2015-07-26 Method for removing pollutants in cadmium-containing sewage
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