Nickel-containing wastewater low-emission treatment process

A treatment process and technology for nickel wastewater, which is applied in metallurgical wastewater treatment, water/sewage treatment, water treatment parameter control, etc., can solve the problem of high nickel discharge, achieve the effect of reducing nickel content, good phosphorus removal, and accelerated nickel removal

Inactive Publication Date: 2021-06-25
深圳市蓝宝实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the treatment of nickel-containing wastewater in the prior art has reached the discharge standard, the discharge of nickel is still relatively high. Therefore, it is urgent to develop a process that can reduce the discharge of nickel from nickel-containing wastewater.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A low-discharge treatment process for nickel-containing wastewater, comprising the following steps:

[0043] (1) Collect 100L of nickel-containing wastewater in the collection pool, put the nickel-containing wastewater in the collection pool into the oxidation pool and add 80wt% sulfuric acid to adjust the pH value to 3, then add 40wt% hydrogen peroxide 5L, stir for 10 minutes before adding Lime powder 5kg, stirring and reacting for 20min, finally adding 10kg of phosphorus removal agent and 6kg of polyaluminum chloride for stirring, wherein the phosphorus removal agent includes 2.5kg of potassium permanganate, 5kg of ferrous sulfate and 2.5kg of sodium silicate, until the redox potential Adjust to 350mv;

[0044] (2) Put the substances in the oxidation tank in step (1) into the No. 1 coagulation reaction tank, and add the hydroxide with a concentration of 1.0×10 -4 mol / L alkali agent, wherein the alkali agent is solid sodium hydroxide and lime powder with a weight rati...

Embodiment 2

[0050] A low-discharge treatment process for nickel-containing wastewater, comprising the following steps:

[0051] (1) Collect 100L of nickel-containing wastewater in the collection pool, put the nickel-containing wastewater in the collection pool into the oxidation pool and add 80wt% sulfuric acid to adjust the pH value to 3.5, then add 10L of 40wt% hydrogen peroxide, stir for 13 minutes before adding Lime powder 8kg, stirred and reacted for 17min, finally added 12kg of phosphorus removal agent and 5kg of polyaluminum chloride for stirring, wherein the phosphorus removal agent included 3kg of potassium permanganate, 6kg of ferrous sulfate and 3kg of sodium silicate until the oxidation-reduction potential was adjusted to 380mv;

[0052] (2) Put the substances in the oxidation tank in step (1) into the No. 1 coagulation reaction tank, and add the hydroxide with a concentration of 1.0×10 -3 mol / L alkali agent, wherein the alkali agent is solid sodium hydroxide and lime powder ...

Embodiment 3

[0058] A low-discharge treatment process for nickel-containing wastewater, comprising the following steps:

[0059] (1) Collect 100L of nickel-containing wastewater in the collection pool, put the nickel-containing wastewater in the collection pool into the oxidation pool and add 80wt% sulfuric acid to adjust the pH value to 4, then add 15L of 40wt% hydrogen peroxide, stir for 15 minutes before adding Lime powder 10kg, stirred and reacted for 15min, and finally added 15kg of dephosphorization agent and 4kg of polyaluminum chloride for stirring, wherein the dephosphorization agent included 3.75kg of potassium permanganate, 7.5kg of ferrous sulfate and 3.75kg of sodium silicate, until the redox The potential is adjusted to 400mv;

[0060] (2) Put the substances in the oxidation tank in step (1) into the No. 1 coagulation reaction tank, and add the hydroxide with a concentration of 1.0×10 -2 mol / L alkali agent, wherein the alkali agent is solid sodium hydroxide and lime powder w...

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PUM

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Abstract

The invention relates to the field of sewage treatment, and particularly discloses a nickel-containing wastewater low-emission treatment process which comprises the following steps: adding 80 wt% of sulfuric acid or 60 wt% of sodium hydroxide into nickel-containing wastewater to adjust the pH value to 3-4, adding 40 wt% of hydrogen peroxide, stirring for reaction, adding lime powder, stirring for reaction, then adding a phosphorus removal agent and polyaluminum chloride for stirring reaction, then adding an alkaline agent, adjusting the pH value, then adding a flocculating agent A, stirring for reaction, and then filtering to obtain filtrate; and adding sodium hypochlorite for stirring reaction, adding lime powder and sodium hydroxide for adjusting the pH value, then adding polyaluminum chloride, stirring for reaction, then adding a flocculating agent B, stirring for reaction, then filtering, and completing the treatment of the nickel-containing wastewater. The nickel-containing wastewater is treated by the nickel-containing wastewater low-emission treatment process, so that the total nickel content in the discharged wastewater is less than 0.06 mg/L, and the total phosphorus content is less than 0.07 mg/L.

Description

technical field [0001] The application relates to the field of sewage treatment, more specifically, it relates to a low-discharge treatment process for nickel-containing wastewater. Background technique [0002] Electroless nickel plating wastewater, circuit board nickel-containing wastewater, electroplating nickel wastewater, etc. will produce nickel-containing wastewater. Nickel is a carcinogenic heavy metal and cannot be biodegraded. It can be enriched in the soil and affect the normal growth of plants. Moreover, its waste water flowing into the water will also affect the production of fisheries, and it can cause serious harm to the environment and human health through the accumulation of food chains. Nickel-containing compounds are absorbed by the skin, which will not only cause cancer but also cause the degradation of the human nervous system. Therefore, nickel-containing wastewater must meet certain discharge standards before it can be discharged outside. [0003] At ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/10C02F101/20C02F103/16
CPCC02F9/00C02F1/66C02F1/725C02F1/722C02F1/5236C02F1/76C02F1/001C02F1/56C02F2209/06C02F2101/105C02F2103/16C02F2101/20
Inventor 胡波胡飞李兴波
Owner 深圳市蓝宝实业有限公司
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