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A wastewater reuse method combining magnetic loading coagulation clarification and membrane separation

A membrane separation and magnetic loading technology, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve high investment and operation costs, low removal rate of dissolved pollutants in water, etc. problems, achieve thorough treatment effects, avoid membrane fouling, and reduce operating costs

Active Publication Date: 2015-09-02
浙江立丰环保设备有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The invention provides a wastewater reuse method combining magnetic loading coagulation clarification and membrane separation, which solves the problems of low removal rate of soluble pollutants in water and high investment and operation cost in the current pretreatment process before membrane separation

Method used

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  • A wastewater reuse method combining magnetic loading coagulation clarification and membrane separation
  • A wastewater reuse method combining magnetic loading coagulation clarification and membrane separation
  • A wastewater reuse method combining magnetic loading coagulation clarification and membrane separation

Examples

Experimental program
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Effect test

Embodiment 1

[0036] The volume of wastewater after biochemical treatment in a printing and dyeing factory is 2000 tons / day, COD is 191mg / L, turbidity is 19.38NTU, suspended matter is 70mg / L, and iron ion is 0.78mg / L.

[0037] The wastewater is lifted into the reaction tank by the centrifugal pump, and 80mg / L of polyaluminum chloride coagulant is added to the reaction tank, and fine flocs are generated under the stirring of the double-layer paddle mixer in the reaction tank at a speed of 73r / min, and the wastewater in the mixing tank is loaded The mixing adopts a single-layer frame mixer with a speed of 43r / min. The fine flocs produced in the reaction tank and the magnetite powder recovered by the magnetic drum separator form dense magnetic nuclei with colloidal properties under the action of the hydraulic mixing speed gradient .

[0038] Add 2 g / ton of polyacrylamide flocculant in the flocculation tank and generate large-particle magnetic flocs under the slow stirring of the double-layer f...

Embodiment 2

[0041] The average influent COD of a city sewage treatment plant is 350mg / L, the average suspended solids is 310mg / L, and the average total phosphorus is 6.8mg / L.

[0042] The wastewater is lifted into the reaction tank, and 300 mg / L of polyaluminum chloride coagulant is added to the reaction tank, and fine flocs are formed under the stirring of the double-layer paddle mixer in the reaction tank at a speed of 85 r / min, and the wastewater is mixed in the loading mixing tank using Single-layer frame mixer with a rotating speed of 37r / min. The fine flocs produced in the reaction tank and the magnetite powder recovered by the magnetic drum separator form dense magnetic nuclei with colloidal properties under the action of hydraulic mixing speed gradient.

[0043] Add 3 g / ton of polyacrylamide flocculant in the flocculation tank and generate large-particle magnetic flocs under the double-layer frame mixer at a slow speed of 15r / min, and then evenly flow into the sedimentation tank th...

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Abstract

The invention discloses a wastewater reuse method combining magnetic loading coagulation clarification and membrane separation. The method comprises the following steps: (1) a coagulant is added into a reaction tank to form small flocs; (2) the small flocs enter a loading and mixing tank to generate magnetic coagulation cores with magnetic carriers; (3) after the magnetic coagulation cores enter a flocculation tank, a flocculant is added to generate large-particle magnetic floccules; (4) after the magnetic floccules are stirred and dispersed strongly by a high-speed dispersion machine, magnetic carriers which are recycled via a magnetic drum separator return to the step (2), supernatant liquor enters a middle water tank via the collection by a water collecting pipe, after being pressurized by a water pump, the supernatant liquor enters membrane separating equipment for fine filtration, and filtered water is discharged for reusing. The method is used for removing particulate matters, colloid and a part of dissolved organic matters in advance before membrane filtration, so that membrane pollution degrees can be effectively avoided or reduced, and the cleaning period and the service life of membrane components are increased. The method can be used for the resource reutilization of the wastewater in industries of printing and dyeing, electroplating, paper-making and the like, as well as the upgrading and reconstruction and the tail water reuse of sewage treatment plants.

Description

technical field [0001] The invention relates to the field of environmental protection technology, in particular to a waste water reuse method combining a magnetic loading coagulation clarification pretreatment process and membrane separation. Background technique [0002] The shortage of water resources and the pollution of the water environment are major environmental problems currently facing our country. Reuse of wastewater for production systems or daily miscellaneous purposes after advanced treatment can not only effectively save and utilize precious fresh water resources, but also reduce the waste of sewage or wastewater. discharge, reduce the pollution of the water environment, and have obvious social, environmental and economic benefits. There are usually three modes of wastewater reuse, coagulation-sedimentation-filtration, coagulation-air flotation-filtration and membrane separation. After membrane separation, the effluent water quality is stable and the filtration...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/12
Inventor 王长智梅荣武韦彦斐任旭峰
Owner 浙江立丰环保设备有限公司
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