CN108217895B - Method for efficiently treating arsenic-containing wastewater - Google Patents
Method for efficiently treating arsenic-containing wastewater Download PDFInfo
- Publication number
- CN108217895B CN108217895B CN201810175657.XA CN201810175657A CN108217895B CN 108217895 B CN108217895 B CN 108217895B CN 201810175657 A CN201810175657 A CN 201810175657A CN 108217895 B CN108217895 B CN 108217895B
- Authority
- CN
- China
- Prior art keywords
- arsenic
- containing wastewater
- feso
- wastewater
- caco
- 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.)
- Expired - Fee Related
Links
- 229910052785 arsenic Inorganic materials 0.000 title claims abstract description 116
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 title claims abstract description 104
- 239000002351 wastewater Substances 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 31
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 36
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims abstract description 26
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 22
- 238000003756 stirring Methods 0.000 claims abstract description 15
- -1 arsenic ions Chemical class 0.000 claims abstract description 11
- 238000012360 testing method Methods 0.000 claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims abstract description 6
- 238000001914 filtration Methods 0.000 claims abstract description 6
- 230000001376 precipitating effect Effects 0.000 claims abstract description 6
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 15
- 230000035484 reaction time Effects 0.000 claims description 4
- 238000001556 precipitation Methods 0.000 claims description 3
- HAYXDMNJJFVXCI-UHFFFAOYSA-N arsenic(5+) Chemical compound [As+5] HAYXDMNJJFVXCI-UHFFFAOYSA-N 0.000 claims description 2
- 239000003814 drug Substances 0.000 abstract description 4
- 238000007599 discharging Methods 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 239000011575 calcium Substances 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000011790 ferrous sulphate Substances 0.000 description 4
- 235000003891 ferrous sulphate Nutrition 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000000920 calcium hydroxide Substances 0.000 description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 3
- 239000006228 supernatant Substances 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 238000009388 chemical precipitation Methods 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 150000002505 iron Chemical class 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 241000282412 Homo Species 0.000 description 1
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- 206010028980 Neoplasm Diseases 0.000 description 1
- 208000000453 Skin Neoplasms Diseases 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 201000011510 cancer Diseases 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 231100000357 carcinogen Toxicity 0.000 description 1
- 239000003183 carcinogenic agent Substances 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 231100000739 chronic poisoning Toxicity 0.000 description 1
- 238000000366 colloid method Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000005008 domestic process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000013048 microbiological method Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000012716 precipitator Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 201000000849 skin cancer Diseases 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009967 tasteless effect Effects 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 210000001835 viscera Anatomy 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 229910006299 γ-FeOOH Inorganic materials 0.000 description 1
Images
Classifications
-
- 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
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved 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
- C02F2101/103—Arsenic compounds
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Removal Of Specific Substances (AREA)
Abstract
The invention relates to a method for efficiently treating arsenic-containing wastewater, which comprises the following specific steps: 1) testing the concentration of arsenic ions in the arsenic-containing wastewater; 2) simultaneous addition of CaCO to arsenic-containing wastewater3And FeSO4Wherein CaCO3、FeSO4The molar ratio of the arsenic-containing wastewater to As element in the arsenic-containing wastewater is 1.5-3.5: 1.5-5: 1, stirring the arsenic-containing wastewater to react, and precipitating and filtering after the reaction is finished. The method has simple and convenient process, high treatment efficiency of more than 99.80 percent, simple components of the used medicament, good economic value, capability of avoiding the problem of secondary pollution caused by the common arsenic removal method, environmental friendliness and wide industrial application prospect, and can reduce the arsenic content in the wastewater to the national standard for discharging the high-concentration or low-concentration arsenic-containing wastewater.
Description
Technical Field
The invention belongs to the technical field of water treatment, and particularly relates to a method for efficiently treating arsenic-containing wastewater.
Background
Arsenic (As) is widely distributed in nature, and is a non-metallic element which is odorless, tasteless and extremely easy to oxidize. Arsenic is mainly present in the natural environment in the form of compounds. Organic and inorganic compounds of arsenic have toxicity of different degrees, so that the arsenic is harmful to human bodies, and if the human bodies drink high-arsenic water for a long time, the arsenic can be accumulated in the human bodies to cause chronic poisoning, so that skin cancer, canceration of internal organs and the like are caused. Due to the potential harm of arsenic to humans, it was identified as the first carcinogen by the united states Centers for Disease Control (CDC) and the international agency for research on cancer (IARC). With the development of the fields of mining, chemical engineering, chemical pharmacy, pesticide production, textile, glass, leather making and the like, a large amount of arsenic-containing wastewater enters a water environment and seriously threatens the safety and health of a human ecosystem, so that the effective treatment of the arsenic-containing wastewater is irresistible, and the development of an efficient and economic arsenic-containing wastewater treatment technology has great social, economic and environmental significance.
The domestic method for treating arsenic-containing waste water includes chemical precipitation method, adsorption method, ion exchange method, membrane separation method and microbiological method, etc., at present, the method for removing arsenic commonly used in industrial production is chemical precipitation method, generally Ca (OH)2And iron salt such as ferric chloride or ferrous sulfate are added to the arsenic-containing wastewater to precipitate arsenic in the water.When the method is used for treating the trivalent arsenic in the wastewater, strong oxidant such as hydrogen peroxide and the like is required to be added to oxidize the trivalent arsenic into pentavalent arsenic for subsequent wastewater treatment, and the pH value of the arsenic-containing wastewater needs to be adjusted in advance when Ca (OH)2OH is quickly released after the addition-Resulting in the formation of Fe (OH)3The activity of the crystal is reduced by crystallization, and the removal efficiency of arsenic is greatly reduced. Meanwhile, a large amount of medicament is consumed in the traditional process, and a large amount of waste residues generated cause secondary pollution to the environment.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art, and provides a method for efficiently treating arsenic-containing wastewater, which has the advantages of simple process, no need of pH value adjustment, addition of only calcium carbonate and ferrous sulfate for arsenic precipitation, no need of addition of any additives such as a precipitator and an oxidant, small medicament dosage, low cost and small sludge amount.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
the method for efficiently treating the arsenic-containing wastewater comprises the following specific steps:
1) testing the concentration of arsenic ions in the arsenic-containing wastewater;
2) simultaneous addition of CaCO to arsenic-containing wastewater3And FeSO4Wherein CaCO3、FeSO4The molar ratio of the arsenic-containing wastewater to As element in the arsenic-containing wastewater is 1.5-3.5: 1.5-5: 1, stirring the arsenic-containing wastewater at normal temperature to react, and precipitating and filtering after the reaction is finished.
Preferably, CaCO in step 2)3、FeSO4The molar ratio of the arsenic-containing wastewater to As element in the arsenic-containing wastewater is 1.5-3: 2-5: 1, when arsenic ions in the arsenic-containing wastewater are As (III), FeSO4: the molar ratio of As is 2.5-5: 1, when the arsenic ion in the arsenic-containing wastewater is As (V), FeSO4: the molar ratio of As is 2-4: 1. the invention utilizes OH slowly released by calcium carbonate in water-With ferrous sulfate, trivalent arsenic can be gradually oxidized into pentavalent arsenic under the condition of the existence of air.
Preferably, the stirring speed in the step 2) is 500-900 rpm.
Preferably, when the arsenic ions in the arsenic-containing wastewater in the step 2) are As (III), the reaction time is 5-12 h; when the arsenic ions in the arsenic-containing wastewater are As (V), the reaction time is 3-8 h.
Preferably, the precipitation time in the step 2) is 1-3.5 h.
The calcium carbonate is added into the arsenic-containing wastewater to firstly generate hydrolysis reaction to generate HCO3 -And OH-. With OH on the surface of calcium carbonate-Is constantly consumed, HCO3 -With H in water+Reaction, evolution of CO2Gas, Fe in solution under stirring2+With CaCO3The particles frequently collide with OH continuously-Binding to form Fe (OH)2In the presence of air Fe (OH)2The oxidation takes place rapidly to form nascent Fe (OH)3Flocculent colloid precipitate, using nascent state Fe (OH)3The ultra-high activity of the compound is coagulated and coprecipitated with arsenic. The method of the invention utilizes CaCO3Slowly release OH-Feature of (2) promoting Fe2+Rapid conversion to Fe3+The presence of oxygen in the water and air simultaneously causes the formation of Fe (OH)3In the form of amorphous colloid, and conventional method (adding Ca (OH)2Then quickly release OH-Resulting in the formation of Fe (OH)3gamma-FeOOH) which is easy to generate crystalline state has higher activity, thereby greatly improving the removal efficiency of arsenic.
The invention has the beneficial effects that: the method has simple and convenient process and high treatment efficiency up to 99.86 percent, can reduce the arsenic content in the wastewater to the national standard requirement for discharging for the arsenic-containing wastewater with high concentration or low concentration (the method can realize the lowest arsenic discharge of 0.035mg/L for the arsenic-containing wastewater treated by the method, which is lower than the standard that the total arsenic content is 0.5mg/L in the current 'comprehensive wastewater discharge standard' index in China), has simple components of the used medicament, better economic value, can avoid the problem of secondary pollution caused by the common arsenic removal method, is environment-friendly and has wide industrial application prospect.
Drawings
FIG. 1 shows the respective addition of Ca in comparative examples 1-2 and example 1 of the present inventionCO3、FeSO4And FeSO4+CaCO3Time-removal test pattern for arsenic.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention is further described in detail below with reference to the accompanying drawings.
The invention was carried out to simulate arsenic-containing waste water (examples 1 and 3 contain pentavalent arsenic ions, example 2 contains trivalent arsenic ions) with an arsenic-containing solution having an initial concentration of 50mg/L of arsenic.
Example 1
A method for efficiently treating arsenic-containing wastewater comprises the following specific steps:
1) simultaneously adding FeSO into arsenic-containing wastewater4And CaCO3Wherein CaCO3: the molar ratio of As is 1.5: 1; FeSO4: the molar ratio of As is 2: 1;
2) fully stirring at normal temperature, wherein the stirring strength is 500rmp, and the stirring time is 4 hours;
3) precipitating and filtering, taking supernatant for assay, wherein the residual concentration of arsenic in the wastewater treated by the process is 0.071mg/L, and the arsenic removal rate is 99.86%, and meets the index of the current wastewater comprehensive discharge standard (the total arsenic content is required to be below 0.5 mg/L) in China.
Comparative example 1
Arsenic-containing wastewater was treated in a similar manner to example 1, except that: adding only CaCO into the arsenic-containing wastewater in the step 1)3，CaCO3The molar ratio of the arsenic-containing wastewater to As in the arsenic-containing wastewater is 1.5: 1.
the test shows that the residual concentration of arsenic in the wastewater treated by the comparative example is 48.63mg/L, and the removal rate of arsenic is 0.85%.
Comparative example 2
Arsenic-containing wastewater was treated in a similar manner to example 1, except that: only adding FeSO into the arsenic-containing wastewater in the step 1)4，FeSO4The molar ratio of the arsenic-containing wastewater to As in the arsenic-containing wastewater is 2: 1.
the test shows that the residual concentration of arsenic in the wastewater treated by the comparative example is 24.60mg/L, and the removal rate of arsenic is 49.33%.
As shown in FIG. 1, the respective addition of CaCO in comparative examples 1-2 and example 13、FeSO4And FeSO4+CaCO3As for the time-removal rate test chart of arsenic, as can be seen from FIG. 1, the effect of adding calcium carbonate alone on arsenic removal is not achieved, the effect of adding iron salt alone on arsenic removal is achieved but the reaction speed is high (1h tends to be stable), and the removal rate is about 50%, in example 1, the removal rate of arsenic is remarkably improved when calcium carbonate and ferrous sulfate are added simultaneously, and tends to be stable in 3h, and the removal rate is higher than 99.5%.
Comparative example 3
Arsenic-containing wastewater was treated in a similar manner to example 1, except that: adding Ca (OH) into arsenic-containing wastewater in step 1)2And FeSO4Wherein Ca (OH)2: the molar ratio of As is 1.5: 1; FeSO4: the molar ratio of As is 2: 1.
the test shows that the residual concentration of arsenic in the wastewater treated by the comparative example is 0.75mg/L, and the removal rate of arsenic is 97.63%. Comparative example 3 and example 1 FeSO was added to the mixture under the same addition amount4+CaCO3And FeSO4+Ca(OH)2Comparison of the arsenic removal rate and the residual concentration data shows that the removal capacity of arsenic is improved by 2 percent compared with the addition of calcium hydroxide in comparative example 3 when calcium carbonate is added in example 1 under the same Ca/Fe molar ratio. Meanwhile, the residual concentration of arsenic after the reaction of the two is greatly changed, and the residual concentration of arsenic of a calcium hydroxide sample with the residual concentration of 0.75mg/L is reduced by 9.5% compared with the residual concentration of the sample with the calcium carbonate of 0.071 mg/L.
Example 2
A method for efficiently treating arsenic-containing wastewater comprises the following specific steps:
1) simultaneously adding FeSO into arsenic-containing wastewater4And CaCO3Wherein CaCO3: the molar ratio of As is 2: 1; FeSO4: the molar ratio of As is 3: 1;
2) fully stirring at normal temperature, wherein the stirring strength is 700rmp, and the stirring time is 6 hours;
3) precipitating, filtering, collecting supernatant, and testing to obtain wastewater with arsenic concentration of 0.279 mg/L.
Example 3
A method for efficiently treating arsenic-containing wastewater comprises the following specific steps:
1) simultaneously adding FeSO into arsenic-containing wastewater4And CaCO3Wherein CaCO3: the molar ratio of As is 2.5: 1; FeSO4: the molar ratio of As is 2.5: 1;
2) fully stirring at normal temperature, wherein the stirring strength is 600rmp, and the stirring time is 3 hours;
3) precipitating, filtering, collecting supernatant, and testing to obtain wastewater with arsenic concentration of 0.164 mg/L.
Claims (4)
1. A method for efficiently treating arsenic-containing wastewater is characterized by comprising the following specific steps:
1) testing the concentration of arsenic ions in the arsenic-containing wastewater;
2) simultaneous addition of CaCO to arsenic-containing wastewater3And FeSO4Wherein CaCO3、FeSO4The molar ratio of the arsenic-containing wastewater to As element in the arsenic-containing wastewater is 1.5-3: 2-5: 1, when the arsenic ions in the arsenic-containing wastewater are As (III), FeSO4: the molar ratio of As is 2.5-5: 1, when the arsenic ion in the arsenic-containing wastewater is As (V), FeSO4: the molar ratio of As is 2-4: 1, stirring the arsenic-containing wastewater at normal temperature to react, and precipitating and filtering after the reaction is finished.
2. The method according to claim 1, wherein the stirring speed in the step 2) is 500 to 900 rpm.
3. The method according to claim 1, wherein when the arsenic ions in the arsenic-containing wastewater in the step 2) are As (III), the reaction time is 5-12 h; when the arsenic ions in the arsenic-containing wastewater are As (V), the reaction time is 3-8 h.
4. The method according to claim 1, wherein the precipitation time in step 2) is 1-3.5 h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810175657.XA CN108217895B (en) | 2018-03-02 | 2018-03-02 | Method for efficiently treating arsenic-containing wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810175657.XA CN108217895B (en) | 2018-03-02 | 2018-03-02 | Method for efficiently treating arsenic-containing wastewater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108217895A CN108217895A (en) | 2018-06-29 |
| CN108217895B true CN108217895B (en) | 2022-03-01 |
Family
ID=62662613
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810175657.XA Expired - Fee Related CN108217895B (en) | 2018-03-02 | 2018-03-02 | Method for efficiently treating arsenic-containing wastewater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108217895B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112108485A (en) * | 2020-08-25 | 2020-12-22 | 锡矿山闪星锑业有限责任公司 | Harmless treatment method of arsenate |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1843961A (en) * | 2006-05-19 | 2006-10-11 | 北京工业大学 | Composite dephosphorizing coagulant dedicated for drinking water |
| CN101475252A (en) * | 2008-11-28 | 2009-07-08 | 浙江大学 | Integrated method for processing arsenic-containing wastewater by using iron composite bentonite |
| CN102765831A (en) * | 2012-07-25 | 2012-11-07 | 中南大学 | Purification method of wastewater containing heavy metal and arsenic |
| CN105417767A (en) * | 2015-11-12 | 2016-03-23 | 中南民族大学 | Method for removing arsenic from sulfate acidic wastewater |
| CN105645643A (en) * | 2016-03-24 | 2016-06-08 | 海安县中丽化工材料有限公司 | Phosphorus-containing sewage treatment method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102557222B (en) * | 2012-02-15 | 2013-06-12 | 天津理工大学 | Method for removing trace arsenic from aqueous solution |
-
2018
- 2018-03-02 CN CN201810175657.XA patent/CN108217895B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1843961A (en) * | 2006-05-19 | 2006-10-11 | 北京工业大学 | Composite dephosphorizing coagulant dedicated for drinking water |
| CN101475252A (en) * | 2008-11-28 | 2009-07-08 | 浙江大学 | Integrated method for processing arsenic-containing wastewater by using iron composite bentonite |
| CN102765831A (en) * | 2012-07-25 | 2012-11-07 | 中南大学 | Purification method of wastewater containing heavy metal and arsenic |
| CN105417767A (en) * | 2015-11-12 | 2016-03-23 | 中南民族大学 | Method for removing arsenic from sulfate acidic wastewater |
| CN105645643A (en) * | 2016-03-24 | 2016-06-08 | 海安县中丽化工材料有限公司 | Phosphorus-containing sewage treatment method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108217895A (en) | 2018-06-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107857426B (en) | Comprehensive treatment method for phosphorus-containing wastewater | |
| CN103991987B (en) | A kind of pretreatment high phosphorus waste water removes technique and the process system thereof of total phosphorus | |
| CN108128917B (en) | Method for removing various pollutants in copper smelting waste acid by using Bayer process red mud | |
| US20130168314A1 (en) | Method for Treating Wastewater Containing Copper Complex | |
| CN102627360B (en) | Method for pretreatment on industrial wastewater by nascent state ferrous iron reduction | |
| CN109081518B (en) | Method for treating hexavalent chromium pollution in water | |
| Li et al. | Phosphate removal from industrial wastewater through in-situ Fe2+ oxidation induced homogenous precipitation: Different oxidation approaches at wide-ranged pH | |
| CN105293775A (en) | Method adopting combined technology of pre-oxidation and coagulating sedimentation to process wastewater containing thallium and ammonia-nitrogen | |
| CN101948195B (en) | Method for performing water treatment by using tetravalent cerium | |
| CN108217895B (en) | Method for efficiently treating arsenic-containing wastewater | |
| CN105036413A (en) | Treatment process for wastewater containing thallium | |
| CN103910428A (en) | Comprehensive utilization method of titanium dioxide waste acid | |
| CN106430714B (en) | Method for advanced treatment of pesticide wastewater | |
| CN101049978A (en) | Method for preparing polymerized iron chloride by using cinder of sulfur iron ore | |
| CN110981031A (en) | Chemical nickel waste water treatment method | |
| CN111995167A (en) | Treatment method of acidic heavy metal wastewater | |
| CN101857300B (en) | In-depth coking wastewater and biochemical tail water treatment agent | |
| CN108558086B (en) | Combined process for removing hexavalent selenium in water | |
| CN105293659A (en) | Stabilization method for emergently treating sediment of heavy metal pollutants in water body | |
| CN113562830B (en) | Preparation method of copper smelting waste acid arsenic precipitating agent | |
| CN102863114A (en) | Deep treatment method for pulping papermaking wastewater | |
| CN105948204A (en) | Treatment agent of wastewater rich in arsenic ions and heavy metal ions and preparation method | |
| CN112299588A (en) | Method for treating industrial wastewater with high content of organic matters and arsenic | |
| CN111167453A (en) | Preparation method and application method of catalyst for removing ammonia nitrogen in water | |
| CN111592190A (en) | Treatment method of carbonate system wastewater |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220301 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |