CN105753209A - Arsenic containing wastewater treatment method - Google Patents
Arsenic containing wastewater treatment method Download PDFInfo
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- CN105753209A CN105753209A CN201610134099.3A CN201610134099A CN105753209A CN 105753209 A CN105753209 A CN 105753209A CN 201610134099 A CN201610134099 A CN 201610134099A CN 105753209 A CN105753209 A CN 105753209A
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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
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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
- 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
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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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
- 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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/103—Arsenic compounds
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- Removal Of Specific Substances (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention provides an arsenic containing wastewater treatment method.The arsenic containing wastewater treatment method includes steps: (1) adding a ferrous salt and an oxidizing agent into arsenic containing wastewater to obtain a solution A; (2) adding a ferric salt into the solution A, controlling a pH value of the arsenic containing wastewater to be 8-12 to obtain a solution B; (3) adding an organic flocculating agent and an inorganic flocculating agent, stirring, standing, and performing primary solid-liquid separation to separate a residue phase from a liquid phase.The arsenic containing wastewater treatment method has the advantages of low equipment requirement, simple technical process and low cost, the arsenic content of the treated wastewater completely reaches the national industrial wastewater discharge standards, residues of the treated wastewater are stable, and further hazards of arsenic toxicity are reduced.
Description
Technical field
The present invention relates to a kind of method of wastewater treatment, particularly relate to the processing method of arsenic-containing waste water.
Background technology
Arsenic compound has severe toxicity, it is easy at people's cylinder accumulation, cause arseniasis.Arsenic pollution poisoning (acute arsenic poisoning: Report) or the nuisance disease (arseniasis) caused are of common occurrence, and wherein, Drinking water endemic arsenism is a kind of common endemic diseases.China drinks high arsenic water area and relates to 10 provinces (district) Yue30Ge county (flag) such as Taiwan, Xinjiang, Inner Mongol, Tibet, Yunnan, Guizhou, Shanxi, Jilin, these areas have occurred Endemic Arsenism Patients, and be mostly less, limit, lean and lack low arsenic water source area.Arsenic is mainly with Inorganic arsenates (AsO4 3-) and arsenite (AsO3 3-) form, or be present in natural water with the form of methylated arsenic compound, respiratory tract, skin or food contact can be passed through and enter human body, be detrimental to health.
Arsenic pollutes and is mainly derived from the exploitation of arsenide, smelting and extensively utilizes, such as the production containing arsenic pesticide and use, and for example as the raw material of the industry such as glass, timber, process hides, weaving, chemical industry, pottery, pigment, chemical fertilizer.Pollute it addition, burning of coal result also in arsenic in various degree.Owing to arsenic is detrimental to health mainly through drinking water, a lot of country in the whole world is all one of arsenic water pollutant being classified as priority acccess control.Arsenic in Drinking Water content standard is decided to be lower than 10ppb by World Health Organization (WHO), and now also will drink Water jet cleaning by standard is decided to be below 10ppb in China.
Currently for the processing method of high-concentration arsenic-containing wastewater, mainly there are neutralization precipitation method, flocculation coprecipitation, ferrite process, sulphide precipitation etc..Wherein, neutralization precipitation method is as applying a kind of wider method in engineering, and mechanism is mainly added alkali (being usually calcium hydroxide) in waste water and improved its pH to 11～12, at this moment can generate calcium arsenite, Tricalcium arsenate precipitation.This method can remove major part arsenic in water, and method is simple, but body refuse precipitation is slowly, it is difficult to by purification of waste water to meeting discharge standard.Flocculation coprecipitation is the method that arsenic-containing waste water is with the most use that processes at present.It is made by adding (or original in waste water) Fe3+、Fe2+、Al3+And Mg2+Plasma, and it is transferred to suitable pH with alkali (being usually calcium hydroxide) so that it is form hydroxide colloid absorption and react with the arsenic in waste water, generating difficulty soluble salt precipitation and be removed.Ferrite process overcomes the defect of neutralization precipitation method, relies on the iron salt added to generate and has adsorbing Fe (OH)2、Fe(OH)3, FeOOH, react with arsenic and generate the less FeAsO of dissolubility4And FeAsO3Precipitation.But, above several method all needs to add substantial amounts of chemical agent, produces a large amount of waste residue, and these waste residues there is no good disposal way at present, there is secondary pollution problem.Sulphide precipitation is to utilize vulcanizing agent (Na2S, NaHS etc.) generate arsenic sulfide precipitation with arsenic in waste water ionic reaction, thus reaching the purpose of arsenic removal, but pH value is had very strict requirement by sulphide precipitation, pH value controls improper meeting and causes arsenic to be again introduced into water body, and generate hydrogen sulfide, hydrogen sulfide has severe toxicity, people can produce injury and can form secondary pollution.
Chinese patent (application number: 201310385447.0) discloses the processing method of a kind of Copper making High-arsenic wastewater, waste water after completing to precipitation pass into oxidizing, solid-liquid separation after addition lime cream and flocculant reaction, clear liquid pH value higher (9～12) after its process, and arsenic concentration is likely to still not up to industrial wastewater discharge standard (GB25466-2010), need to add discharge after clear water dilutes, hydrogen peroxide large usage quantity (H2O2The ratio of quality and Copper making High-arsenic wastewater volume is (0.1～10): 100g/ml), relatively costly.Chinese patent (application number: 201210090680.1) discloses the coupled processing method of a kind of acid High-arsenic wastewater, the step such as including precipitated sulfur acid group, oxidation precipitation, primary inclined plate sedimentation separates, oxidation is stirred, secondary inclined plate sedimentation separation, iron salt coagulation, dissolved air flotation, process regulates pH and oxidation processes twice, need a large amount of alkaline precipitating agent and oxidant, relatively costly.Chinese patent (application number: 96116742.4) provides a kind of method processing arsenic-containing waste water, pH value of waste water is regulated to 12 or higher with calcium compounds, need a large amount of Calx, this adds increased the calcium hardness of cost and water outlet, after-cost is higher, iron salt selects iron chloride so that in water outlet, chloride ion content is also higher.Chinese patent (application number: 201010165722.4) proposes a kind of method for treating low-concentration arsenic-containing wastewater, utilizes soda bath to regulate pH value and with cleaning membrane filtration, considerably increase cost in its operating process.Chinese patent (application number: 201110304407.X) discloses the processing method of a kind of high-concentration arsenic-containing wastewater, relate in pH and the step such as adjustment, oxidation precipitation (I), oxidation precipitation (II), iron salt coagulation, dissolved air flotation, wherein use substantial amounts of lime cream and oxidant, and repeatedly solid-liquid separation, add raw material and equipment investment.Chinese patent (application number: 201310025352.8) discloses the processing method of a kind of arsenic-containing waste water, the metalloid arsenic that sulfide carries out processing continuously to remove in waste water is added by multistage, precipitated by electrochemistry and aerating oxidation and waste water is carried out advanced treating, utilize sodium sulfide arsenic removal, it is likely to result in the effusion of hydrogen sulfide gas, operator are produced personal injury and secondary pollution can be formed, and sodium sulfide is expensive, subsequent electrochemical method and aeration and sedimentation add again cost.Chinese patent (application number: 201110308990.1) proposes a kind of arsenic-containing waste water and the deep treatment method of arsenic polluted underground water or drinking water, after process, in water, arsenic content can reach the drinking water standard that WHO specifies, but its just for low concentration arsenic-containing waste water (according to embodiment, the highest arsenic concentration is only 102ppm), for high-concentration arsenic-containing wastewater, arsenic removal effect is not ideal enough.Chinese patent (application number: 200910312545.5) proposes the processing method of a kind of high arsenic height alkali waste water, ferrous sulfate and oxidant is added under aeration condition, polyaddition iron sulfate flocculation in clear liquid after solid-liquid separation, and control the pH of solution, solid-liquid separation after standing, arranges outside clear liquid, and after process, arsenic concentration can reach country's surface water three class water quality standard, but its need aeration and artificially acid adding to control the pH of water outlet, this considerably increases cost.Chinese patent (application number: 201510212060.4) relates to the processing method of a kind of industry arsenic-containing waste water, employing two-section treatment processes, first it is neutralized to wastewater pH terminal more than 5 with alkali liquor, obtain one section and process water, process toward one section again and water adds Polyferric Sulfate and oxidant, control two-stage nitration and process water terminal more than 5, but it is confined to the process (4～30ppm) of low arsenic waste water, High-arsenic wastewater is not tested, and two-stage nitration goes out Water jet cleaning and still could possibly be higher than 0.3ppm (embodiment one, three, five), fail to reach discharge standard.
Growing and big containing day by day opening up of arsenic goods market along with industries such as metallurgy, chemical industry, the discharge of arsenic-containing waste water and pollution problem, will have influence on the raising of people's living standard, have influence on the improvement of environment for human survival.Find a kind of simple to operate, operating cost is low, environmental friendliness and be applicable to variable concentrations arsenic-containing waste water processing method extremely urgent.
Summary of the invention
Present invention is primarily targeted at and overcome problems of the prior art, it is provided that the processing method of a kind of arsenic-containing waste water, especially a kind of dosing is few, arsenic removal rate is high, technological process is simple and is applicable to the processing method of variable concentrations arsenic-containing waste water.
For achieving the above object, the invention provides the processing method of a kind of arsenic-containing waste water, comprise the steps:
(1) in arsenic-containing waste water, add ferrous salt and oxidant, obtain solution A；
(2) adding iron salt in solution A, the pH value controlled in arsenic-containing waste water is 8～12, obtains B solution；
(3) adding organic flocculant and inorganic flocculating agent in B solution, stirring carries out first time solid-liquid separation after standing, by slag phase and liquid phase separation.
According to the embodiment of the present invention, farther including: step (4) adds inorganic flocculating agent in step (3) gained liquid phase, stirring carries out second time solid-liquid separation after standing.
Wherein, step is initially charged ferrous salt in (1) in arsenic-containing waste water, then adds oxidant.Ferrous salt can add with simple substance or its aqueous solution form.
Step (1) adds ferrous salt or its aqueous solution, is advantageous on the one hand promoting the oxidation of arsenic to can substitute for part iron salt on the other hand, reduces reagent cost.Described ferrous salt is water miscible ferrous salt.Preferably, described ferrous salt at least one in ferrous chloride, ferrous sulfate, ferrous nitrate, iron iodide, ferrous bromide and Ferrous acetate.Described ferrous salt is (0.57～2.18) with the mol ratio of arsenic in aqueous phase (waste water): 1, it is preferable that (0.61～1.98): 1.
Adding oxidant in step (2) in arsenic-containing waste water and carry out pretreatment, react 10～60 minutes, make trivalent arsenic all be oxidized to pentavalent arsenic, strengthening precipitated ferric arsenate generates.Described oxidant at least one in SODIUM PERCARBONATE, sodium hypochlorite, hydrogen peroxide, potassium peroxydisulfate, Ammonium persulfate., bleaching powder and chlorine dioxide.The mol ratio of described oxidant and arsenic in waste water content is (0.87～4.56): 1, it is preferable that (1.20～3.70): 1.
Step (3) adds iron salt or molysite aqueous solution in arsenic-containing waste water, the pH value controlled in arsenic-containing waste water is 8～12, make the arsenic in liquid phase be converted into arsenic acid iron salt (with arsenic acid calcium salt, regulate pH value time employ calcium containing compound), formed precipitation.Iron salt can add with simple substance or its aqueous solution form.Described iron salt at least one in ferric chloride, iron sulfate, bodied ferric sulfate, ferric nitrate, nitrous acid ferrum, thiocyanation ferrum, ferric bromide and iron acetate.The mol ratio of described iron salt addition and arsenic in waste water is (0.08～0.39): 1, it is preferable that (0.10～0.30): 1.The reagent of described control pH value of solution at least one in calcium oxide, sodium carbonate, sodium hydroxide and calcium hydroxide.
Adding organic flocculant and inorganic flocculating agent in step (4) in arsenic-containing waste water, organic flocculant is high polymer coagulant, adds organic flocculant and is conducive to the sedimentation of precipitated ferric arsenate.
Described organic flocculant at least one in polyacrylamide (PAM), polyacrylic acid (PAA), sodium polyacrylate (PAAS) etc., wherein polyacrylamide (PAM) includes cationic-type polyacrylamide (CPAM), anion-polyacrylamide (APAM) and non-ionic polyacrylamide (NPAM), the number-average molecular weight of described polyacrylamide is 6,000,000～12,000,000, and addition is 5～50g/ ton waste water；Described polyacrylic acid mode of appearance is solid, and number-average molecular weight is 2,500,000～5,000,000, is made into aqueous solution during use, and addition is 1～10g/ ton waste water；The addition of described sodium polyacrylate is 1～10g/ ton waste water.
Described inorganic flocculating agent at least one in iron sulfate, aluminium polychlorid, bodied ferric sulfate, poly-ferric sulfate chloride and poly-phosphorus iron chloride.Inorganic flocculating agent can be directly added into, or be configured to solution (formulation agents) and add afterwards.The addition of inorganic flocculating agent is (0.15～0.76) with the mol ratio of arsenic in arsenic-containing waste water: 1, it is preferable that (0.20～0.62): 1.
Compared with processing technique with existing arsenic-containing waste water, utilizing the present invention to process arsenic-containing waste water has following several advantage:
1. the removal that sulphide precipitation is not suitable in sewage micro amount of arsenic, it is only applicable to the sewage of industrial high-content arsenic is carried out preliminary arsenic removal, can effectively remove arsenic in acid condition, and operating process is comparatively strict to the control of pH value, pH value is too high, the arsenic that can cause precipitation is anti-molten, has again hydrogen sulfide gas to overflow when pH value is too low, and sulfide itself is poisonous, expensive, in acid condition can not simultaneously fluorine removal, hydrogen sulfide gas has severe toxicity, and operator are produced personal injury.The scheme that the present invention proposes, the arsenic for Coal Gas Washing Cycling Water and low concentration is respectively provided with good removal effect, and raw material is cheap and easy to get, and arsenic slag thing is stable mutually, environmental friendliness；Adding oxidant, trivalent arsenic can be made more up hill and dale to be oxidized to pentavalent arsenic on the one hand, on the other hand, relative to aerating oxidation, energy consumption is substantially reduced, and has saved cost；
2. first time refer to the use of SODIUM PERCARBONATE in the treatment of waste water, and it has the advantage that I. SODIUM PERCARBONATE is considered as H2O2And Na2CO3Adduct, have H concurrently2O2And Na2CO3Double effects, play the pH value that improve water body while Oxidation, decrease the use of follow-up pH adjusting agent, reduce cost；And Na2CO3Existence can make again in water body exist Ca2+Precipitation, reduces the calcium hardness of water body, reduces the cost that follow-up water body calcium hardness processes.II. SODIUM PERCARBONATE has stronger washing dirt-removing functions, can play the effects such as bleaching, sterilization, be conducive to purifying water body；
3. the lime-iron salt method arsenic removal process that contrast is traditional, added amount of chemical of the present invention greatly reduces, and the final arsenic in water body quantity of slag is greatly decreased.Traditional handicraft (lime-iron salt method) often processes one cube of acid water (waste water for arsenic concentration > 1000ppm) two sections and neutralizes that always to go out the quantity of slag be 65～300Kg, the present invention often processes one cube of acid water (waste water for arsenic concentration > 1000ppm) two sections and neutralizes always to go out the quantity of slag and be only 25～130Kg, the arsenic quantity of slag is only the 1/3～1/2 of traditional handicraft, reduces follow-up dangerous solid waste processing cost；
4. add ferrous salt and not only can promote H2O2Play Oxidation better, and in acid condition, Fe2+With H2O2Reaction has Fe2(SO4)3Generation, it is possible to replace part iron salt, reduce reagent cost；
5. utilizing sodium hydroxide, sodium carbonate to do pH adjusting agent, relative to lime cream, mobility is higher, carries more convenient, and the requirement of pump power is lower, energy efficient；
6. the present invention can be under field conditions (factors), the arsenic-containing waste water of variable concentrations is focused on, the heavy metal ion of the overwhelming majority in waste water can be removed simultaneously, and technological process is simple, small investment, after process, liquid phase arsenic content reaches GB25466-2010 standard, thus being the process of enterprise's arsenic-containing waste water, it is provided that an approach economically and efficiently.
Accompanying drawing explanation
Fig. 1: the process chart of method for treating arsenic-containing wastewater of the present invention.
Detailed description of the invention
The present invention is described in detail by following specific embodiment, but the present invention is not restricted to following example.
Embodiment 1:
The present embodiment is about 350mg/L smeltery arsenic-containing waste water for arsenic concentration and processes.
Take 200ml smeltery arsenic-containing waste water, add 0.72gFeSO4·7H2nullO，Stirring adds the industrial hydrogen peroxide aqueous solution that 0.22g mass fraction is 27.5% after making it be completely dissolved，After stirring 50min under room temperature，Adding 0.12g mass fraction is the liquor ferri trichloridi of 50%，Quickly stir 1min，Adding the sodium hydroxide adjustment water sample pH that mass fraction is 20% therebetween is 8.67，Slowly the polymeric ferrous sulphate solution that 0.30g mass fraction is 40% and the PAM aqueous solution that 1.80g mass fraction is 0.18% are continuously added after stirring 5 minutes，At the uniform velocity after stirring 5min，Stop stirring，Solid-liquid separation after standing 30min，Filtrate adds the polymeric ferrous sulphate solution of 0.24g mass fraction 40%，Continue stirring 5min，Stop stirring，Solid-liquid separation after standing 30min，Take filtrate and measure remaining arsenic and all the other heavy metal ion contents.
Before and after wastewater treatment, water quality index data are as shown in table 1:
Water quality index before and after table 1. wastewater treatment
Embodiment 2:
The present embodiment is about 500mg/L mine acidic arsenic-containing waste water for arsenic concentration and processes.
Taking 600ml acid wastewater in mine, adding 8.76g mass fraction is the FeBr of 25%2Solution, it is the liquor natrii hypochloritis of 5.5% that stirring adds 6.85g available chlorine content after making it be completely dissolved, after stirring 30 minutes under room temperature, adding 0.63g mass fraction is the iron nitrate solution of 50%, quickly stirring regulated pH with sodium carbonate after 1 minute is 9.23, the poly-ferric sulfate chloride solution that 1.15g mass fraction is 40% and the CPAM aqueous solution that 1.35g mass fraction is 0.12% is continuously added after being slowly stirred 5 minutes, after quickly stirring 1 minute, low rate mixing 10 minutes, stop stirring, filter paper filtering after standing 30 minutes, solid-liquid separation, take filtrate and measure remaining arsenic and all the other heavy metal ion contents.
Before and after wastewater treatment, water quality index data are as shown in table 2:
Water quality index before and after table 2. wastewater treatment
Embodiment 3:
The present invention is directed to arsenic concentration to be about 1000mg/L smeltery arsenic-containing waste water and process.
Taking 500ml lead ore waste acid water, adding 6.60g mass fraction is the FeSO of 25%4·7H2nullO solution (is now joined)，The industrial hydrogen peroxide aqueous solution that 1.76g mass fraction is 27.5% is added after being uniformly mixed，After stirring 30 minutes under room temperature，Adding 0.75g mass fraction is the polymeric ferrous sulphate solution of 40%，Quickly stirring regulated pH with the lime cream that mass fraction is 30% after 1 minute is about 10.26，The PAA aqueous solution of poly-phosphorus ferric chloride solution that 1.22g mass fraction is 40% and 2.25g mass fraction 0.25% is continuously added after being slowly stirred 5 minutes，After quickly stirring 1 minute，Low rate mixing 10 minutes，Stop stirring，Filter paper filtering after standing 30 minutes，Solid-liquid separation，Filtrate enters second operation work and processes，Add the poly-phosphorus ferric chloride solution that 0.61g mass fraction is 40%，After quickly stirring 1 minute，Low rate mixing 10 minutes，Stop stirring，Filter after standing 30 minutes，Solid-liquid separation，Take filtrate and measure remaining arsenic and all the other heavy metal ion contents.
Before and after wastewater treatment, water quality index data are as shown in table 3:
Water quality index before and after table 3. wastewater treatment
Embodiment 4:
The present invention is directed to arsenic concentration to be about 1500mg/L mine acidic arsenic-containing waste water and process.
Take 300ml smeltery arsenic-containing waste water, add the Fe (CH that 5.07g mass fraction is 25%3COO)2Solution (is now joined), stirring drips 1.12g industry SODIUM PERCARBONATE after making it be completely dissolved, after stirring 30 minutes under room temperature, adding 0.60g mass fraction is the polymeric ferrous sulphate solution of 50%, quickly stirring regulated pH with calcium oxide after 1 minute is 10.82, the poly-ferric sulfate chloride solution that 1.28g mass fraction is 50% and the APAM aqueous solution that 0.84g mass fraction is 0.2% is continuously added after being slowly stirred 5 minutes, at the uniform velocity stirring 10 minutes, stop stirring, filter paper filtering after standing 30 minutes, solid-liquid separation, filtrate adds the poly-ferric sulfate chloride solution of 0.32g mass fraction 50%, continue stirring 5min, stop stirring, solid-liquid separation after standing 30min, take filtrate and measure remaining arsenic and all the other heavy metal ion contents.
Before and after wastewater treatment, water quality index data are as shown in table 4:
Water quality index before and after table 4. wastewater treatment
Embodiment 5:
The present invention is directed to arsenic concentration to be about 9000mg/L smeltery arsenic-containing waste water and process.
Take 400ml smeltery containing arsenic waste acid water, add 8.24gFeSO4·7H2nullO，22.63g potassium peroxydisulfate is added after being uniformly mixed，After stirring 30 minutes under room temperature，Adding 3.88g mass fraction is the polymeric ferrous sulphate solution of 50%，Quickly stirring regulated pH with the lime cream that mass fraction is 30% after 1 minute is 11.76，The polymeric ferrous sulphate solution that 5.72g mass fraction is 50% and the PAAS aqueous solution that 4.80g mass fraction is 0.15% is continuously added after being slowly stirred 5 minutes，After at the uniform velocity stirring 5 minutes，Stop stirring，Filter paper filtering after standing 30 minutes，Solid-liquid separation，Filtrate enters second operation work and processes，Adding 2.44g mass fraction is the polymeric ferrous sulphate solution of 50%，Quickly stir and be slowly stirred 10 minutes，Stop stirring，Filter after standing 30 minutes，Solid-liquid separation，Take filtrate and measure remaining arsenic and all the other heavy metal ion contents.
Before and after wastewater treatment, water quality index data are as shown in table 5:
Water quality index before and after table 5. wastewater treatment
Arsenic slag stability experiment: we compared for rear arsenic slag processed by the invention and after traditional handicraft (lime-iron salt method) processes the leaching arsenic content of arsenic slag, specific operation process following (being People's Republic of China (PRC) state environment protecting standard HJ557-2010 with reference to foundation): applying pressure filter, after first arsenic slag being filtered, obtain initial liquid phase, weigh the arsenic slag (dry solid percentage rate is more than 9%) that butt weight is 100g again, it is placed in 2L extraction flask, it is that 10: 1 (L/Kg) add digestion agent (water by liquid-solid ratio, GB/T6682, two grades), it is vertically fixed on horizontal shaking device after covering tightly bottle cap, regulating frequency of oscillation is 110 ± 10 times/min, amplitude is 40mm, at room temperature take off extraction flask after vibration 8h, stand 16h.When oscillatory process having gas produce, timing should open extraction flask in fume hood, discharge excessive pressure, filter-press installs filter membrane, filter and collect leachate, it is acidified to pH < 2 by after initial liquid phase and leachate mix homogeneously with nitric acid, utilizes By Hydride Generation-atomic Fluorescence Spectrometry detection arsenic content.Experimental result is as shown in table 6:
Table 6. is arsenic slag leaching arsenic content after the present invention and traditional handicraft process
| Sample | Leaching arsenic content (ppm) |
| Traditional handicraft, arsenic slag initial liquid phase mix with leachate after water sample | 7.3460 |
| The present invention, arsenic slag initial liquid phase mix with leachate after water sample | 3.2036 |
Data from table, we it appeared that, under same treatment condition and standing time, relative to traditional handicraft (lime-iron salt method), arsenic slag leaching arsenic content after present invention process reduces significantly, lower than the limit value (As:5mg/L) of regulation in GB5085.3-2007, it is believed that without Leaching, environmental friendliness.
Claims (18)
1. a processing method for arsenic-containing waste water, comprises the following steps:
(1) in arsenic-containing waste water, add ferrous salt and oxidant, obtain solution A；
(2) adding iron salt in solution A, the pH value controlled in arsenic-containing waste water is 8～12, obtains B solution；
(3) adding organic flocculant and inorganic flocculating agent in B solution, stirring carries out first time solid-liquid separation after standing, by slag phase and liquid phase separation.
2. the processing method of arsenic-containing waste water according to claim 1, farther includes: add inorganic flocculating agent in step (3) gained liquid phase, and stirring carries out second time solid-liquid separation after standing.
3. the processing method of arsenic-containing waste water according to claim 1, it is characterised in that step is initially charged ferrous salt in (1) in arsenic-containing waste water, then adds oxidant.
4. the processing method of arsenic-containing waste water according to claim 1, it is characterised in that described ferrous salt at least one in ferrous chloride, ferrous sulfate, ferrous nitrate, iron iodide, ferrous bromide and Ferrous acetate.
5. the processing method of arsenic-containing waste water according to claim 1, it is characterised in that the mol ratio of described ferrous salt and arsenic in waste water is (0.57～2.18): 1.
6. the processing method of arsenic-containing waste water according to claim 5, it is characterised in that the mol ratio of described ferrous salt and arsenic in waste water is (0.61～1.98): 1.
7. the processing method of arsenic-containing waste water according to claim 1, it is characterised in that described oxidant at least one in SODIUM PERCARBONATE, sodium hypochlorite, hydrogen peroxide, potassium peroxydisulfate, Ammonium persulfate., bleaching powder and chlorine dioxide.
8. the processing method of arsenic-containing waste water according to claim 1, it is characterised in that the mol ratio of described oxidant and arsenic in waste water is (0.87～4.56): 1.
9. the processing method of arsenic-containing waste water according to claim 8, it is characterised in that the mol ratio of described oxidant and arsenic in waste water is (1.20～3.70): 1.
10. the processing method of arsenic-containing waste water according to claim 1, it is characterised in that described iron salt at least one in ferric chloride, iron sulfate, bodied ferric sulfate, ferric nitrate, nitrous acid ferrum, thiocyanation ferrum, ferric bromide and iron acetate.
11. the processing method of arsenic-containing waste water according to claim 1, it is characterised in that the mol ratio of described iron salt addition and arsenic in waste water is (0.08～0.39): 1.
12. the processing method of arsenic-containing waste water according to claim 11, it is characterised in that the mol ratio of described iron salt addition and arsenic in waste water is (0.10～0.30): 1.
13. the processing method of arsenic-containing waste water according to claim 1, it is characterised in that the reagent controlling pH is selected from least one in calcium oxide, sodium carbonate, sodium hydroxide and calcium hydroxide.
14. the processing method of arsenic-containing waste water according to claim 1, it is characterised in that described organic flocculant at least one in polyacrylamide (PAM), polyacrylic acid (PAA) and sodium polyacrylate (PAAS).
15. the processing method of arsenic-containing waste water according to claim 14, it is characterised in that the addition of described polyacrylamide is 5～50g/ ton waste water；The addition of described polyacrylic acid or sodium polyacrylate is 1～10g/ ton waste water.
16. the processing method of arsenic-containing waste water according to claim 1, it is characterised in that described inorganic flocculating agent at least one in iron sulfate, aluminium polychlorid, bodied ferric sulfate, poly-ferric sulfate chloride and poly-phosphorus iron chloride.
17. the processing method of arsenic-containing waste water according to claim 1, it is characterised in that the addition of described inorganic flocculating agent is (0.15～0.76) with the mol ratio of arsenic in arsenic-containing waste water: 1.
18. the processing method of arsenic-containing waste water according to claim 17, it is characterised in that the addition of described inorganic flocculating agent is (0.20～0.62) with the mol ratio of arsenic in arsenic-containing waste water: 1.
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