Method for treating heavy-metal sewage by using multistage chemical precipitation

A chemical precipitation and heavy metal technology, which is applied in the direction of precipitation treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc., can solve the problems of complicated sewage treatment technical solutions and less heavy metal sewage, so as to save the amount of acid and alkali, and simplify the process. Realize and improve the effect of sedimentation efficiency

Inactive Publication Date: 2016-09-07
SICHUAN GERUISI ENVIRONMENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Existing technical solutions for sewage treatment are numerous and complicated, but there are few technical solutions for treating heavy metal sewage by multi-stage chemical precipitation

Method used

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  • Method for treating heavy-metal sewage by using multistage chemical precipitation

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Effect test

Embodiment 1

[0030] A method for treating heavy metal sewage by using multi-stage chemical precipitation:

[0031] (1) Introduce the heavy metal sewage into the acid adjustment tank, add hydrochloric acid and ferrous sulfate, adjust the pH to 2.0, and the residence time is 1.5h to obtain sewage 1;

[0032] (2) Sewage 1 is introduced into the first-level pH adjustment tank again, and sodium hydroxide and sodium sulfide are added to adjust the pH to 6.0, and the residence time is 1h, and then pass through the first-level coagulation inclined tube sedimentation tank to obtain sewage 2;

[0033] (3) After sewage 2 is introduced into the secondary pH adjustment tank, sodium hydroxide and calcium hydroxide are added to adjust the pH to 8.5, and the residence time is 0.5h, and then pass through the secondary coagulation inclined tube sedimentation tank to obtain sewage 3;

[0034] (4) After the sewage 3 is introduced into the three-stage pH adjustment tank, sodium hydroxide is added to adjust the...

Embodiment 2

[0037] A method for treating heavy metal sewage by using multi-stage chemical precipitation:

[0038] (1) Introduce the heavy metal sewage into the acid adjustment tank, add hydrochloric acid and ferrous sulfate, adjust the pH to 3.0, and the residence time is 2.5h to obtain sewage 1;

[0039] (2) Sewage 1 is introduced into the first-level pH adjustment tank again, and sodium hydroxide and sodium sulfide are added to adjust the pH to 7.0, and the residence time is 2h, and then pass through the first-level coagulation inclined tube sedimentation tank to obtain sewage 2;

[0040] (3) After the sewage 2 is introduced into the secondary pH adjustment tank, sodium hydroxide and calcium hydroxide are added to adjust the pH to 9.5, and the residence time is 1h, and then the sewage 3 is obtained through the secondary coagulation inclined tube sedimentation tank;

[0041] (4) After the sewage 3 is introduced into the three-stage pH adjustment tank, sodium hydroxide is added to adjust ...

Embodiment 3

[0044] A method for treating heavy metal sewage by using multi-stage chemical precipitation:

[0045] (1) Introduce the heavy metal sewage into the acid adjustment tank, add hydrochloric acid and ferrous sulfate, adjust the pH to 2.5, and the residence time is 2h to obtain sewage 1;

[0046] (2) Introduce sewage 1 into a primary pH adjustment tank, add sodium hydroxide and sodium sulfide, adjust the pH to 6.5, and stay for 1.5 hours, then pass through a primary coagulation inclined tube sedimentation tank to obtain sewage 2;

[0047] (3) After the sewage 2 is introduced into the secondary pH adjustment tank, sodium hydroxide and calcium hydroxide are added to adjust the pH to 9, the residence time is 0.8h, and then the sewage 3 is obtained through the secondary coagulation inclined tube sedimentation tank;

[0048] (4) After the sewage 3 is introduced into the three-stage pH adjustment tank, sodium hydroxide is added to adjust the pH to 10, and the residence time is 60 minutes...

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Abstract

The invention provides a method for treating heavy-metal sewage by using multistage chemical precipitation. The method comprises the following treatment step: sequentially introducing the heavy-metal sewage into an acid regulation pool, a first-stage pH regulation pool, a first-stage coagulative inclined-tube precipitation tank, a second-stage pH regulation pool, a second-stage coagulative inclined-tube precipitation tank, a third-stage pH regulation pool, a third-stage coagulative inclined-tube precipitation tank and a pH adjusting tank. Multistage step-by-step pH regulation is carried out, corresponding reaction drugs are added in different pH ranges in an auxiliary manner so as to remove different heavy-metal ions, and the efficient and fine control on a pH value is achieved; meanwhile, the pH ranges are regulated step by step, so that the consumption of acids / bases can be lowered, and whether automatic control or manual control can be achieved simply; the precipitation tanks are the inclined-tube precipitation tanks, so that the efficiency of precipitation is increased.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a method for treating heavy metal sewage by using multi-stage chemical precipitation. Background technique [0002] With the influx of a large number of rural population into cities in our country, the urban population continues to increase, and the urban water resources have been severely damaged. Our country is facing the problem of water resource depletion. Water resources are the guarantee for human survival. It is a non-renewable resource. It not only affects people's production and life, but also has an important impact on my country's national conditions and national destiny. It can be seen that it is urgent to strengthen the urban sewage treatment work in our country. [0003] Urban sewage is mainly domestic sewage, industrial wastewater, etc. discharged in the city. These wastewater are mainly collected through the urban sewage pipe network or discharged into the water b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/20
CPCC02F9/00C02F1/66C02F2001/007C02F2101/20C02F2301/08
Inventor 陈方方雷弢
Owner SICHUAN GERUISI ENVIRONMENT TECH CO LTD
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