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Solid-liquid separation system for heavy metal wastewater treatment after chemical precipitation

A chemical precipitation, solid-liquid separation technology, applied in water/sewage treatment, natural water treatment, metallurgical wastewater treatment, etc., can solve the problems of complex process procedures, high operating energy consumption, restricting large-scale promotion and application, etc. The effect of reducing, reducing operating energy consumption, easy integration of technology and highly automatic control

Active Publication Date: 2010-11-24
JIANGXI JDL ENVIRONMENTAL PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main technical principle of continuous microfiltration technology is to adopt the principle of tubular microfiltration membrane cross-flow filtration. Under the action of the water pump, the mud-water mixture circulates at a high speed in the tubular microfiltration system at 3-5m / s, and the water in the mud-water mixture passes through. The solid particles with a particle size larger than the membrane hole are intercepted. The pore size of the continuous microfiltration membrane is generally less than 0.1 μm, which can remove particulate impurities larger than 0.1 μm from the raw water and achieve high-concentration sludge. This separation method requires the mud-water mixture to be refluxed in a large proportion under the action of the circulating pump, and the energy consumption is very high. 3 , and it adopts external installation, it needs to design a separate continuous microfiltration room, and the process procedure is complicated, which restricts its large-scale promotion and application

Method used

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  • Solid-liquid separation system for heavy metal wastewater treatment after chemical precipitation
  • Solid-liquid separation system for heavy metal wastewater treatment after chemical precipitation
  • Solid-liquid separation system for heavy metal wastewater treatment after chemical precipitation

Examples

Experimental program
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Effect test

Embodiment 1

[0035] The copper-containing wastewater produced by the acidic copper plating process of an electroplating enterprise has a copper ion concentration of about 100 mg / L. It is filtered and separated by a square plate microfiltration membrane 11 with an area of ​​6 square meters and a pore size of 10 μm. The material of the membrane is polyvinylidene fluoride (PVDF). Copper ions in copper-containing wastewater react with hydroxide to form copper hydroxide precipitation when the pH is greater than 9, and the mud-water mixture enters the membrane filtration area. Copper hydroxide solid particles are continuously enriched and accumulated under the interception effect of the plate membrane material, and the concentration continues to increase. The operating parameters of the membrane filtration system are the suction time of 8 minutes, the backwash time of 1 minute, the suction stroke of the suction pump is 1m, and the lift of the backwash pump is 1m. When the sludge concentration i...

Embodiment 2

[0037] The nickel-containing waste water discharged by a circuit board manufacturer has a nickel ion concentration of 20-40mg / l, and is filtered and separated by a circular plate-type microfiltration membrane (12) with a pore size of 2um and a diameter of 110mm. The material of the membrane is polyvinyl chloride ( PVC). After the pH value of the wastewater containing nickel is adjusted to 5-6 by adding alkali, nickel ions react with hydroxide to form nickel hydroxide precipitation, and the mud-water mixture enters the membrane filtration area. Copper hydroxide solid particles are continuously enriched and accumulated under the interception of membrane materials, and the concentration continues to increase. The operating parameters of the membrane filtration system are the suction time of 12 minutes, the backwash time of 2 minutes, the suction stroke of the suction pump is 3m, and the lift of the backwash pump is 4m. When the sludge concentration in the system reaches 20,000 m...

Embodiment 3

[0039]Chromium-containing waste water discharged by an electroplating production enterprise, after hexavalent chromium ions are oxidized and reduced to trivalent chromium ions, the concentration is 10-20 mg / l, and the circular plate microfiltration membrane 12 with a diameter of 185 mm and a pore size of 0.4 μm is used for filtration Separation, the membrane material is polyethersulfone (PES). The heavy metal wastewater containing trivalent chromium adjusts the pH value of the wastewater to 10-11 by adding alkali, chromium ions react with hydroxide to form chromium hydroxide precipitate, and the mud-water mixture enters the membrane filtration area. Chromium hydroxide solid particles are continuously enriched and accumulated under the interception effect of the membrane material, and the concentration continues to increase. The operating parameters of the membrane filtration system are the suction time of 10 minutes, the backwash time of 3 minutes, the suction stroke of the su...

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Abstract

The invention relates to a solid-liquid separation system for heavy metal wastewater after chemical treatment and a solid-liquid separation method which can achieve high efficiency, better separation effect and continuous operation. The solid-liquid separation system comprises a membrane component water-production pipeline and a backwashing pipeline, wherein the membrane component water-production pipeline is formed by connecting a membrane component, a membrane component water-production pipe (1), an electro connecting pressure gauge (3), a suction pump (4) and a water-production pipe (2) together which are built in a membrane filtration area; the backwashing pipeline is formed by connecting a backwashing water pump (10), a backwashing pipe (5), an electro connecting pressure gauge (3) and a membrane component water-production pipe (1) together; the membrane component is composed of a membrane box (7) and a membrane material (8); and the membrane material is a plate or hollow fiber microfiltration or ultrafiltration membrane material the bore diameter of which is 0.01-10mum.

Description

technical field [0001] The invention relates to a heavy metal wastewater treatment system, in particular to a solid-liquid separation system after the heavy metal wastewater is chemically treated. Background technique [0002] Heavy metals are easy to bioaccumulate through the food chain, posing a serious threat to organisms and human health. How to effectively control heavy metal wastewater pollution has become a common concern of mankind. At present, the commonly used treatment methods for heavy metal wastewater include physical, chemical and biological methods. Among them, physical methods, such as ion exchange, are limited by the variety, output and cost of the exchanger, and their large-scale use is limited. Chemical methods and membrane separation technologies have become the mainstream of heavy metal wastewater treatment. [0003] (1) chemical method [0004] Chemical precipitation has become the mainstream of heavy metal wastewater treatment. Its main process is: ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/44C02F1/62
CPCC02F1/66C02F1/444C02F2103/16C02F2209/03C02F2101/20C02F2103/346C02F1/5236
Inventor 廖志民
Owner JIANGXI JDL ENVIRONMENTAL PROTECTION CO LTD