Method for removing cobalt in sewage

A technology for sewage and wastewater, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as unsuitable drinking water, secondary pollution of chemical reagents, etc., and achieve treatment effect Significant, low operating cost, simple process effect

Inactive Publication Date: 2013-03-13
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The publication number is CN1067229, which discloses a "cobalt-containing wastewater treatment method". Its main technical feature is that the cobalt-containing wastewater is sequentially added with an oxidant, a co-precipitant and an alkali in an acidic environment, and the cobalt is finally precipitated in the form of cobalt hydroxide, but The chemical reagents in this method are prone to secondary pollution and are obviously not suitable for drinking water
The publication number is CN1715204, which discloses a method of using pyrite powder to treat cobalt-containing wastewater, and realizes the effect of treating waste with waste. However, pyrite powder contains many substances harmful to human body, so it is not suitable for drinking in the water

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0018] (1) Add 300ppm polyaluminum chloride successively to the cobalt-containing wastewater for flocculation and sedimentation; (2) adjust the pH of the settled wastewater to 9.5 with caustic; (3) then add 10ppm ionic dispersant and 20ppm surface active (4) Then, a micro-nano aerator with a bubble diameter of 1 μm was placed in the cobalt-containing wastewater for aeration treatment. After 30 minutes of aeration, a layer of greasy matter appeared on the upper layer of the wastewater, and a slag scraper was used to Just scrape it off. The cobalt in the wastewater was reduced from 171mg / L to 0.17mg / L, and the cobalt removal rate reached 99.91%.

example 2

[0020] (1) Add 300ppm polyaluminum chloride successively to the cobalt-containing wastewater for flocculation and sedimentation; (2) adjust the pH of the settled wastewater to 10.0 with caustic; (3) then add 12ppm ionic dispersant and 25ppm surface active (4) Then, a micro-nano aerator with a bubble diameter of 3 μm was placed in the cobalt-containing wastewater for aeration treatment. After 40 minutes of aeration, a layer of greasy matter appeared in the upper layer of the wastewater, and a slag scraper was used to Just scrape it off. The cobalt in the waste water is reduced from 98mg / L to 0.05mg / L, and the cobalt removal rate reaches 99.95%.

example 3

[0022] (1) Add 300ppm polyaluminum chloride successively to the cobalt-containing wastewater for flocculation and sedimentation; (2) adjust the pH of the settled wastewater to 11.0 with caustic; (3) then add 15ppm ionic dispersant and 30ppm surface active (4) Then, a micro-nano aerator with a bubble diameter of 5 μm was placed in the cobalt-containing wastewater for aeration treatment. After 45 minutes of aeration, a layer of greasy matter appeared in the upper layer of the wastewater. Use a slag scraper Just scrape it off. The cobalt in the wastewater was reduced from 69mg / L to 0.03mg / L, and the cobalt removal rate reached 99.96%.

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PUM

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Abstract

The invention discloses a method for removing cobalt in sewage, belonging to the field of sewage treatment in environmental protection. The method comprises the following steps: adding polyaluminum chloride, ion dispersant and surfactant into cobalt-containing sewage, flocculating, stirring, and aerating to achieve the purpose of removing cobalt, wherein the ion dispersant is one of sodium carboxymethyl cellulose and ethylene bis stearamide wax; and the surfactant is one of sodium dodecyl benzene sulfonate, sodium dodecyl sulfate, octadecyl trimethyl ammonium chloride and octadecyl trimethyl ammonium bromide. The method disclosed by the invention has the characteristics of wide raw material sources, low price, relatively low pharmaceutical dosage, low operating cost, no secondary pollution in the treatment process, high cobalt removal efficiency and high cobalt removal rate (up to 99.9% or above) the like.

Description

technical field [0001] The invention relates to a method for removing cobalt in sewage, which belongs to the field of waste water treatment in environmental protection. Background technique [0002] Cobalt is a rare, widely distributed and highly toxic metal element, which mostly exists in the form of compounds. The abundance in nature is very low, only 0.75 mg / kg. Its toxicity is greater than that of mercury, cadmium, lead, arsenic and chromium. second only to methylmercury. Cobalt and its compounds have been included in the blacklist of water priority pollutants and the monitoring index system of my country's surface water environmental quality standards. The concentration of cobalt in natural water bodies is very low, but with the increasing use of cobalt, a large amount of cobalt and its compounds enter the environment, especially the cobalt entering water bodies through mine weathering and leaching, industrial wastewater discharge, atmospheric deposition and soil erosi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
Inventor 万玉山李娜王莉
Owner CHANGZHOU UNIV
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