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Sludge dynamic nucleation flocculated heavy metal wastewater advanced treatment method

A technology for advanced treatment of heavy metals, applied in water/sludge/sewage treatment, water/sewage multi-stage treatment, chemical instruments and methods, etc., can solve heavy metal wastewater with large fluctuations in water quality, unstable purification effect, and total sewage discharge Advanced problems, to achieve the effect of shortening the hydraulic retention time, reducing the total discharge of pollutants, and reducing the amount of mud produced

Active Publication Date: 2014-06-25
SHENZHEN POLYTECHNIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a heavy metal wastewater advanced treatment method for sludge dynamic nucleation and flocculation in view of the existing heavy metal wastewater with large fluctuations in water quality, resulting in unstable purification effects, high total sewage discharge, and high treatment costs.

Method used

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Embodiment Construction

[0013] Establish a set of wastewater treatment devices including raw water tank, primary reaction unit, secondary mixing unit, tertiary flocculation unit, folding plate sedimentation tank (solid-liquid separation unit), and set up chemical dosing device, online monitoring device, raw water pump , return pump, etc. The chemical dosing device includes an acid reagent dosing tank, an alkali reagent dosing tank, a coagulant dosing tank and a flocculant dosing tank, and the online monitoring device includes a pH online monitor and a liquid level monitor. Through the above-mentioned device, dynamic nucleation after sludge reflux can be realized as the main body of flocculation to efficiently treat heavy metal wastewater. The dosage of chemicals and pH value can be precisely controlled through the online monitoring device and automatic control system, and the effluent can continuously meet the requirements of the multi-component membrane separation system. Water quality requirements....

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Abstract

A sludge dynamic nucleation flocculated heavy metal wastewater advanced treatment method comprises the following steps: allowing heavy metal wastewater to sequentially go through a first-stage reaction unit, a second-stage mixing unit and a third-stage flocculation unit, adding an acid solution or an alkali solution to maintain the first-stage reaction unit water in a range of 5-9.2 and the pH value of water in a second-stage mixing unit the pH value in a range of 7.8-8.2, adding an inorganic coagulant into the second-stage mixing unit according to a concentration of 3-10mg / L, and adding an organic polymeric flocculant according to a concentration of 5-15mg / L; and sending a product obtained after the treatment through the third-stage flocculation unit to a solid-liquid separation unit, and treating to obtain treated water and flocculated sludge, and returning 20-30% of the flocculated sludge to the first-stage reaction unit as a coagulation and flocculation body. The method has the characteristics of stable purification effect, low total amount of pollution discharge, low treatment cost and the like.

Description

technical field [0001] The invention relates to an industrial waste water treatment method, in particular to a waste water treatment method used in industries polluted by heavy metals. Background technique [0002] In the wastewater purification system of heavy metal polluted industries, coagulation and sedimentation technology has always occupied a dominant position. All kinds of pollutants in the wastewater of heavy metal polluted industries are finally removed in the form of sedimentation sludge after being treated by coagulation sedimentation purification process. This kind of traditional heavy metal wastewater treatment process generally adopts two-stage coagulation and sedimentation treatment process. Some coagulants use ferric chloride (or aluminum sulfate polyaluminum) and polyacrylamide for the two-stage coagulant, and some coagulants use three-stage coagulation for the first stage. Ferric chloride, polyacrylamide, aluminum sulfate and polyacrylamide are used for t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
Inventor 朱佳王斌远高静思韦伟
Owner SHENZHEN POLYTECHNIC