CN105948324A

CN105948324A - Method for removing arsenic in sewage

Info

Publication number: CN105948324A
Application number: CN201610464041.5A
Authority: CN
Inventors: 陈朝民
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-06-23
Filing date: 2016-06-23
Publication date: 2016-09-21

Abstract

The invention belongs to the technical field of sewage treatment, and particularly relates to a method for removing arsenic in sewage. The method comprises the following steps: 1) adding limestone into sewage to regulate the pH value of the sewage to 8-10; 2) adding an arsenic remover into sewage, reacting at the rotation speed of 200-500 r/min for 5-10 minutes to obtain a mixed solution, adding zeolite powder, standing for 6-12 hours, and pouring out the supernatant; 3) adding a flocculant into the supernatant, stirring uniformly, standing for 12-24 hours, pouring out the supernatant, and adding hydrochloric acid into the obtained supernatant to regulate the pH value to 6-7. The method can effectively remove arsenic and other harmful ingredients in sewage, has the advantages of stable treatment effect, short technical process, high safety, environment friendliness and the like, is simple to operate, and thus, has wide application prospects.

Description

A kind of remove the method for arsenic in sewage

Technical field

The present invention relates to technical field of sewage, having is a kind of to remove the method for arsenic in sewage.

Background technology

Arsenic is a kind of element with metalloid characteristic, be distributed widely in big gas and water, soil, rock and In organism.In natural water, the arsenic of dissolving typically with Inorganic arsenates, arsenite form or with Methylated arsenic compound form exists.The energy force rate pentavalent arsenic that trivalent arsenic enters cell is strong, and it is malicious Property is also stronger several times than pentavalent arsenic.But the toxicity of pentavalent arsenic also can not be ignored, it can be converted into trivalent in vivo Arsenic；And pentavalent arsenic contestable replaces phosphate, thus affect many enzymatic biochemical reactions.

At present, in arsenic-containing waste water process field, main administering method has iron sulfate precipitation method, iron filings The sedimentation method, sulfur dioxide method, ion exchange, electrolysis.Iron sulfate precipitation method equipment is simple, place Reason amount is big, and dearsenization is effective, but consumption is big, the quantity of slag is big.The iron filings sedimentation method energy treatment of wastes with processes of wastes against one another, is processed into This is low, but water treatment efficiency is unstable.Sulfur dioxide method achieves the recycling of arsenic, but sulfur dioxide Also it is the material having certain toxicity, is not suitable for large-scale promotion and uses.The recyclable arsenic of ion exchange, place Reason effectiveness comparison is stable, but ion exchange resin treatment cost is high.Therefore, how to select a kind of rationally, Effectively, practical remove the method for arsenic in sewage, be the difficult problem currently generally faced.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of removes the method for arsenic in sewage, has process effect The advantages such as the most stable, simple to operate, safety and environmental protection.

For solve above-mentioned technical problem, the present invention by the following technical solutions:

A kind of removing the method for arsenic in sewage, step is as follows: 1) put into limestone, regulation dirt in sewage Water pH value is 8～10；2) in sewage, arsenic removing agent is put into, under rotating speed is 200～500r/min, Reaction 5～10min, obtains mixed solution, adds zeolite powder, stands 6～12 hours, pour out supernatant； 3) put into flocculant at supernatant, after stirring, stand 12～24 hours, pour out supernatant, institute Obtain supernatant adding hydrochloric acid regulation is 6～7 to pH value,.

Further improvement as technique scheme:

The preparation method of described arsenic removing agent is: adds iron chloride and aluminum chloride in water, prepares iron ion dense The mixed solution that degree is 0.1～1mol/L, aluminium ion concentration is 0.1～1mol/L, adds hydroxide Sodium solution regulation is 7～8 to pH value, removes supernatant, wash precipitate 2～5 with water after standing clarification After secondary, vacuum filtration machine filter and washs, solid matter crushed after being dried to 80～120 mesh, i.e. Can.

The consumption of described arsenic removing agent is preferably the 0.05%～0.1% of sewage weight.

Described flocculant is prepared by the raw material of following weight parts: sodium silicate 1～5 parts, magnesium chloride 1～5 parts, 70% ethanol 5～10 parts, polyacrylamide 1～5 parts, titanium tetrachloride 1～5 parts, Kaolin 0.1～ 0.5 part, aluminum sulfate 1～5 parts, water 10～20 parts.The preparation process of described flocculant is: 1) by silicon Acid sodium proportionally mixes with magnesium chloride, is subsequently adding 70% ethanol and stirs；2) by polyacrylamide Amine, titanium tetrachloride, Kaolin and aluminum sulfate co-grinding are powdered, add water mix homogeneously；3) will Step 1) and step 2) the product mix homogeneously that obtains, i.e. can get product.

The consumption of described flocculant is preferably the 0.05%～0.5% of sewage weight.

The invention have the benefit that

Method of the invention, it is possible to the harmful components such as the arsenic effectively removed in sewage, water after single treatment Middle residual arsenic ion concentration is less than 0.45mg/L, less than the first discharge standard of national regulation, has process The advantages such as effect stability, simple to operate, technological process is short, safety and environmental protection, application prospect is the most wide.

Detailed description of the invention

Below in conjunction with specific embodiment for instruction and explanation of the present invention.

Embodiment 1

Removing the method for arsenic in sewage, step is as follows: 1) puts into limestone in sewage, regulates sewage PH value is 8；2) in sewage, put into arsenic removing agent, under rotating speed is 400r/min, react 10min, Obtain mixed solution, add zeolite powder, stand 6 hours, pour out supernatant；3) flocculation is put at supernatant Agent, after stirring, stands 20 hours, pours out supernatant, and gained supernatant adds hydrochloric acid and regulates extremely PH value is 7,.

Wherein, the preparation method of arsenic removing agent is: adds iron chloride and aluminum chloride in water, prepares iron ion Concentration is 0.1mol/L, aluminium ion concentration is the mixed solution of 0.5mol/L, adds sodium hydroxide solution Regulating to pH value is 8, removes supernatant, after washing precipitate 2 times with water, in vacuum after standing clarification Filter on sucking filtration machine and wash, solid matter crushed after being dried to 100 mesh,.The consumption of arsenic removing agent For sewage weight 0.1%.

Flocculant is prepared by the raw material of following weight parts: sodium silicate 1 part, 3 parts of magnesium chloride, 70% ethanol 10 parts, polyacrylamide 1 part, titanium tetrachloride 3 parts, Kaolin 0.5 part, 1 part of aluminum sulfate, water 15 Part.The preparation process of flocculant is: 1) is proportionally mixed with magnesium chloride by sodium silicate, is subsequently adding 70% ethanol stirs；2) by polyacrylamide, titanium tetrachloride, Kaolin and aluminum sulfate co-grinding Powdered, add water mix homogeneously；3) by step 1) and step 2) the product mix homogeneously that obtains, I.e. can get product.The consumption of flocculant is the 0.5% of sewage weight.

Embodiment 2

Removing the method for arsenic in sewage, step is as follows: 1) puts into limestone in sewage, regulates sewage PH value is 9；2) in sewage, put into arsenic removing agent, under rotating speed is 500r/min, react 5min, Mixed solution, adds zeolite powder, stands 8 hours, pour out supernatant；3) flocculant is put at supernatant, After stirring, standing 24 hours, pour out supernatant, gained supernatant adds hydrochloric acid and regulates to pH value It is 6,.

Wherein, the preparation method of arsenic removing agent is: adds iron chloride and aluminum chloride in water, prepares iron ion Concentration is 0.5mol/L, aluminium ion concentration is the mixed solution of 1mol/L, adds sodium hydroxide solution and adjusts Saving to pH value is 7, removes supernatant, after washing precipitate 3 times with water, take out in vacuum after standing clarification Filter on filter and wash, solid matter crushed after being dried to 120 mesh,.The consumption of arsenic removing agent is The 0.05% of sewage weight.

Flocculant is prepared by the raw material of following weight parts: sodium silicate 3 parts, 5 parts of magnesium chloride, 70% ethanol 5 parts, polyacrylamide 3 parts, titanium tetrachloride 5 parts, Kaolin 0.1 part, 3 parts of aluminum sulfate, water 20 Part.The preparation process of flocculant is: 1) is proportionally mixed with magnesium chloride by sodium silicate, is subsequently adding 70% ethanol stirs；2) by polyacrylamide, titanium tetrachloride, Kaolin and aluminum sulfate co-grinding Powdered, add water mix homogeneously；3) by step 1) and step 2) the product mix homogeneously that obtains, I.e. can get product.The consumption of flocculant is the 0.05% of sewage weight.

Embodiment 3

Removing the method for arsenic in sewage, step is as follows: 1) puts into limestone in sewage, regulates sewage PH value is 10；2) in sewage, put into arsenic removing agent, under rotating speed is 200r/min, react 8min, Obtain mixed solution, add zeolite powder, stand 12 hours, pour out supernatant；3) wadding is put at supernatant Solidifying agent, after stirring, stands 12 hours, pours out supernatant, and gained supernatant adds hydrochloric acid and regulates extremely PH value is 7,.

Wherein, the preparation method of arsenic removing agent is: adds iron chloride and aluminum chloride in water, prepares iron ion Concentration is 1mol/L, aluminium ion concentration is the mixed solution of 0.1mol/L, adds sodium hydroxide solution and adjusts Saving to pH value is 8, removes supernatant, after washing precipitate 5 times with water, take out in vacuum after standing clarification Filter on filter and wash, solid matter crushed after being dried to 80 mesh,.The consumption of arsenic removing agent is dirty The 0.06% of water weight.

Flocculant is prepared by the raw material of following weight parts: sodium silicate 5 parts, 1 part of magnesium chloride, 70% ethanol 8 parts, polyacrylamide 5 parts, titanium tetrachloride 1 part, Kaolin 0.3 part, 5 parts of aluminum sulfate, water 10 Part.The preparation process of flocculant is: 1) is proportionally mixed with magnesium chloride by sodium silicate, is subsequently adding 70% ethanol stirs；2) by polyacrylamide, titanium tetrachloride, Kaolin and aluminum sulfate co-grinding Powdered, add water mix homogeneously；3) by step 1) and step 2) the product mix homogeneously that obtains, I.e. can get product.The consumption of flocculant is the 0.2% of sewage weight.

Claims

1. remove the method for arsenic in sewage for one kind, it is characterised in that step is as follows: 1) in sewage Putting into limestone, regulation pH value of sewage water is 8～10；2) in sewage, arsenic removing agent is put into, at rotating speed Be under 200～500r/min, react 5～10min, obtain mixed solution, add zeolite powder, stand 6～ 12 hours, pour out supernatant；3) supernatant put into flocculant, after stirring, stand 12～ 24 hours, pouring out supernatant, it is 6～7 to pH value that gained supernatant adds hydrochloric acid regulation,.

Method the most according to claim 1, it is characterised in that the preparation side of described arsenic removing agent Method is: adding iron chloride and aluminum chloride in water, prepared iron concentration is 0.1～1mol/L, aluminum Ion concentration is the mixed solution of 0.1～1mol/L, adds sodium hydroxide solution regulation and to pH value is 7～8, remove supernatant after standing clarification, after washing precipitate 2～5 times with water, at vacuum filtration machine Upper filtration is also washed, solid matter crushed after being dried to 80～120 mesh,.

Method the most according to claim 2, it is characterised in that: the consumption of described arsenic removing agent is The 0.05%～0.1% of sewage weight.

Method the most according to claim 1, it is characterised in that: described flocculant is by following heavy The raw material of amount part prepares: sodium silicate 1～5 parts, magnesium chloride 1～5 parts, 70% ethanol 5～10 parts, Polyacrylamide 1～5 parts, titanium tetrachloride 1～5 parts, Kaolin 0.1～0.5 part, aluminum sulfate 1～ 5 parts, water 10～20 parts.

Method the most according to claim 4, it is characterised in that the preparation of described flocculant Cheng Wei: 1) sodium silicate is proportionally mixed with magnesium chloride, be subsequently adding 70% ethanol and stir； 2) by powdered to polyacrylamide, titanium tetrachloride, Kaolin and aluminum sulfate co-grinding, then add Water mix homogeneously；3) by step 1) and step 2) the product mix homogeneously that obtains, i.e. can be produced Product.

Method the most according to claim 5, it is characterised in that the consumption of described flocculant is The 0.05%～0.5% of sewage weight.