CN104649467A

CN104649467A - Treatment method for zinc, lead, arsenic and cadmium-containing wastewater

Info

Publication number: CN104649467A
Application number: CN201410183819.6A
Authority: CN
Inventors: 吴小红; 罗启超; 李永安; 钟德洪
Original assignee: Wuzhou Guangxi Yuan Jiang Lithopone Co Ltd
Current assignee: Wuzhou Guangxi Yuan Jiang Lithopone Co Ltd
Priority date: 2014-05-04
Filing date: 2014-05-04
Publication date: 2015-05-27
Anticipated expiration: 2034-05-04
Also published as: CN104649467B

Abstract

The invention discloses a treatment method for zinc, lead, arsenic and cadmium-containing wastewater, belonging to the technical field of wastewater treatment. In the treatment method, primarily, sulfur ions are used for reacting with harmful substance ions, such as zinc, lead, arsenic, cadmium and copper ions, in the zinc, lead, arsenic and cadmium-containing wastewater to generate a small granule substance, then, the small granule substance is adsorbed to form bigger granules by the adsorption force of a ferric hydroxide colloid, the bigger granules are separated out from the solution, and thus, the content of the harmful substances, such as zinc, lead, arsenic, cadmium and copper, in the zinc, lead, arsenic and cadmium-containing wastewater is lowered, the zinc, lead, arsenic and cadmium-containing wastewater can be discharged directly or reused as industrial water after being treated by the method of the invention.

Description

The treatment process of the waste water containing zinc, lead, arsenic, cadmium

Technical field

The invention belongs to technical field of waste water processing, be specifically related to a kind for the treatment of process of the treatment process at the waste water containing zinc, lead, arsenic, cadmium.

Background technology

In Industrial processes, a large amount of trade effluents can be attended by produce, containing a large amount of objectionable impuritiess such as zinc, lead, arsenic, cadmium, copper in some waste water, if just directly discharge will inevitably impact environmental quality without process, bring the harm being difficult to reverse even to the living space of people and HUMAN HEALTH, there is very large environmental risk and potential safety hazard.Such as Longjiang, rivers and ponds in 2012 cadmium pollution environment event and He Prefecture He Jiang cadmium pollution environment event in 2013, this has all beaten alarm bell to people.Thus, first must carry out advanced treatment to this waste water, reduce the content of these objectionable impuritiess in waste water, waste water is converted into the common pollution-free water without harm, just can carry out follow-up process.

Summary of the invention

The invention provides a kind for the treatment of process of the waste water containing zinc, lead, arsenic, cadmium, waste water containing zinc, lead, arsenic, cadmium is after the method process, the content of the objectionable impuritiess such as its zinc contained, lead, arsenic, cadmium, copper is low, can directly discharge, also can again as process water.

In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:

A treatment process for waste water containing zinc, lead, arsenic, cadmium, the method comprises the following steps:

A, in reactor, add pending waste water under agitation, solution A and ferric hydroxide colloid, and by the addition of these three kinds of reactants, the potential of hydrogen controlling material in reactor is not less than pH=14, and the time is no less than 10 minutes;

B, step A reaction after, continue in reactor, to add pending waste water under agitation, solution A and ferric hydroxide colloid, and pass through the addition of these three kinds of reactants, control the potential of hydrogen of material in reactor in the scope of 7≤pH < 9, the time is no less than 10 minutes;

C, after step B reaction, continue in reactor, to add pending waste water under agitation, solution A and ferric hydroxide colloid, and by the addition of these three kinds of reactants, the potential of hydrogen controlling liquid in reactor reaches 9≤pH≤10;

Slag charge in D, filtering reactor after step C reaction;

Further, described substance A refers to a kind of in barium sulfide solution and sodium sulfide solution or both mixtures.

Owing to adopting technique scheme, the present invention has following beneficial effect:

1, the present invention mainly first utilizes sulfonium ion to generate finely ground particle substance with the objectionable impurities ionic reaction such as zinc, lead, arsenic, cadmium, copper in the waste water containing zinc, lead, arsenic, cadmium, and then the finely ground particle substance of generation carries out adsorbing and becomes larger particle by the adsorptive power that has of ferric hydroxide colloid utilized, separate out from solution, thus the content of the objectionable impurities such as zinc, lead, arsenic, cadmium, copper in reduction waste water, thus reduce its not treated just directly discharge and the environmental risk that causes and potential safety hazard.

2, the waste water containing zinc, lead, arsenic, cadmium is by after process of the present invention, the content of the objectionable impuritiess such as its zinc contained, lead, arsenic, cadmium, copper is low, can directly discharge, also can again be used in industrial production as effect process water, the recirculation achieving water uses.

Embodiment

Embodiment 1

A, in reactor, add pending waste water under agitation, barium sulfide solution and the waste residue containing ferric hydroxide colloid, by the potential of hydrogen of material in pH detection paper reactor, the potential of hydrogen that pH detection paper shows this material does not in this way reach pH=14, then by the addition of these three kinds of reactants of adjustment, make its potential of hydrogen be not less than pH=14, the time is 10 minutes;

B, step A reaction after, continue in reactor, to add pending waste water under agitation, barium sulfide solution and the waste residue containing ferric hydroxide colloid, by the potential of hydrogen of material in pH detection paper reactor, pH detection paper shows the potential of hydrogen of this material in the scope of 7≤pH < 9 in this way, then by the addition of these three kinds of reactants of adjustment, make its potential of hydrogen in the scope of 7≤pH < 9, the time is 10 minutes;

C, step B reaction after, continue in reactor, to add pending waste water under agitation, barium sulfide solution and the waste residue containing ferric hydroxide colloid, by the potential of hydrogen of material in pH detection paper reactor, pH detection paper shows the potential of hydrogen of this material is not in this way pH=10, then by the addition of these three kinds of reactants of adjustment, its potential of hydrogen is made to be pH=10;

Slag charge in D, filtering reactor after step C reaction.

In the present embodiment, waste residue containing ferric hydroxide colloid used refers in production zinc sulfide white process, sulfuric acid dissolution is added after being starched by the zinc impregnation of zinc sulfide white material oxidation, and by waste residue that the solution of zinc sulfate that obtains after dissolving obtains after iron removal by oxidation demanganization, the main component of this waste residue is ferric hydroxide colloid, in addition containing impurity such as zinc, cadmium and arsenic, and in this waste residue, the leaching content of zinc, cadmium and arsenic is large, can not directly discharge.

Carry out content detection to the waste water containing zinc, lead, arsenic, cadmium after the present embodiment process, it the results are shown in Table 1-1.

Table 1-1

From above-mentioned table 1-1, can find out, the content of the objectionable impurities such as zinc, lead, arsenic, cadmium, copper in the waste water containing zinc, lead, arsenic, cadmium after this enforcement process is few, thus reduces the environmental risk and potential safety hazard that its not treated just direct discharge are caused.

According to " Hazardous wastes judging standard, leaching characteristic identification " (GB5080.3-2007) and " Hazardous wastes judging standard, corrodibility is differentiated " discrimination method of (GB5085.1-2007), carry out toxicity discriminating and corrodibility discriminating respectively to the waste residue containing ferric hydroxide colloid before and after using in the present embodiment, it the results are shown in Table 1-2.

Table 1-2 solid waste leaching test result

As can be seen from table 1-2, the present embodiment, while process contains the waste water of zinc, lead, arsenic, cadmium, can reduce the leaching content of zinc, cadmium and arsenic in this waste residue, reach the effect of killing two birds with one stone, save the cost of trade effluent Solid state fermentation.

Embodiment 2

A, in reactor, add pending waste water under agitation, sodium sulfide solution and ferric hydroxide colloid, by the potential of hydrogen of material in pH detection paper reactor, the potential of hydrogen that pH detection paper shows this material does not in this way reach pH=14, then by the addition of these three kinds of reactants of adjustment, make its potential of hydrogen be not less than pH=14, the time is 12 minutes;

B, step A reaction after, continue in reactor, to add pending waste water under agitation, sodium sulfide solution and ferric hydroxide colloid, by the potential of hydrogen of material in pH detection paper reactor, pH detection paper shows the potential of hydrogen of this material in the scope of 7≤pH < 9 in this way, then by the addition of these three kinds of reactants of adjustment, make its potential of hydrogen in the scope of 7≤pH < 9, the time is 16 minutes;

C, step B reaction after, continue in reactor, to add pending waste water under agitation, sodium sulfide solution and ferric hydroxide colloid, by the potential of hydrogen of material in pH detection paper reactor, pH detection paper shows the potential of hydrogen of this material is not in this way pH=9, then by the addition of these three kinds of reactants of adjustment, its potential of hydrogen is made to be pH=9;

Slag charge in D, filtering reactor after step C reaction.

In the present embodiment, ferric hydroxide colloid used refers to the material containing 100% ferric hydroxide colloid monomer.

Carry out content detection respectively to the waste water before and after the present embodiment process, it the results are shown in Table 2.

Table 2

From above-mentioned table 2, can find out, the content of the objectionable impurities such as zinc, lead, arsenic, cadmium, copper in the waste water containing zinc, lead, arsenic, cadmium after this enforcement process is few, thus reduces the environmental risk and potential safety hazard that its not treated just direct discharge are caused.

Embodiment 3

A, in reactor, add pending waste water, sodium sulfide solution, barium sulfide solution and ferric hydroxide colloid under agitation, by the potential of hydrogen of material in pH detection paper reactor, the potential of hydrogen that pH detection paper shows this material does not in this way reach pH=14, then by the addition of these four kinds of reactants of adjustment, make its potential of hydrogen be not less than pH=14, the time is 10 minutes;

B, step A reaction after, continue in reactor, to add pending waste water, sodium sulfide solution, barium sulfide solution and ferric hydroxide colloid under agitation, by the potential of hydrogen of material in pH detection paper reactor, pH detection paper shows the potential of hydrogen of this material in the scope of 7≤pH < 9 in this way, then by the addition of these four kinds of reactants of adjustment, make its potential of hydrogen in the scope of 7≤pH < 9, the time is 12 minutes;

C, step B reaction after, continue in reactor, to add pending waste water under agitation, sodium sulfide solution and ferric hydroxide colloid, by the potential of hydrogen of material in pH detection paper reactor, pH detection paper shows the potential of hydrogen of this material is not in this way pH=9, then by the addition of these four kinds of reactants of adjustment, its potential of hydrogen is made to be pH=9;

Slag charge in D, filtering reactor after step C reaction.

Carry out content detection respectively to the waste water before and after the present embodiment process, it the results are shown in Table 3.

Table 3-1

From above-mentioned table 3, can find out, the content of the objectionable impurities such as zinc, lead, arsenic, cadmium, copper in the waste water containing zinc, lead, arsenic, cadmium after this enforcement process is few, thus reduces the environmental risk and potential safety hazard that its not treated just direct discharge are caused.

Claims

1. a treatment process for the waste water containing zinc, lead, arsenic, cadmium, is characterized in that comprising the following steps:

A, in reactor, add pending waste water under agitation, solution A and ferric hydroxide colloid, and by the addition of these three kinds of reactants, the potential of hydrogen controlling material in reactor is not less than pH=14, and the time is no less than 10 minutes; Wherein, described substance A is the aqueous solution of alkaline earth sulfide;

Slag charge in D, filtering reactor after step C reaction.

2. a kind for the treatment of process of waste water containing zinc, lead, arsenic, cadmium according to claim 1, is characterized in that described substance A refers to a kind of in barium sulfide solution and sodium sulfide solution or both mixtures.