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Dye or pesticide waste water reverse osmosis-nanofiltration combined membrane separation material recovery process and apparatus

A pesticide wastewater and reverse osmosis technology, applied in the field of environmental engineering, can solve the problems of difficult biodegradation, high salt content, low treatment efficiency, etc.

Inactive Publication Date: 2010-06-02
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Technical problem: The present invention aims at the current technical blank, and provides a dye or pesticide wastewater reverse osmosis-nanofiltration combined membrane separation material recovery process and its device. The technical problem of low treatment efficiency of wastewater due to high concentration, high salt content, and refractory biodegradation

Method used

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  • Dye or pesticide waste water reverse osmosis-nanofiltration combined membrane separation material recovery process and apparatus
  • Dye or pesticide waste water reverse osmosis-nanofiltration combined membrane separation material recovery process and apparatus

Examples

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Effect test

Embodiment 1

[0010] A dye or pesticide wastewater reverse osmosis-nanofiltration combined membrane separation material recovery process, the process steps are: under the water temperature of 25-35°C, adjust the pH value of the wastewater to be treated in the storage tank to 6.5-9.0; After pressurization, it enters the media filter to remove suspended solids with a particle size > 1mm. The filler in the media filter is quartz sand or ceramsite with a particle size of 0.5-1.2mm; ~1μm colloid, and control the sedimentation index SDI of the effluent -10 Inorganic salts and organic matter on the order of m, the operating pressure of the reverse osmosis device is 1.0-2.0 MPa, and the material of the reverse osmosis membrane is polyamide; MPa, the removal particle size is 10 -9 Divalent salts and organic matter on the order of m, recover dyes, pesticides and related intermediates in the effluent, and use polyamide as the nanofiltration membrane material; combine and collect the permeate from the ...

Embodiment 2

[0012] A device for dye or pesticide wastewater reverse osmosis-nanofiltration combined membrane separation material recovery process, the device includes a water storage tank 2, a media filter 4, a microfilter 6, a reverse osmosis device 12 and a nanofilter 16, the above-mentioned device consists of The water inlet and outlet pipes are connected sequentially, and a pH adjustment device 1 is provided in the water storage tank, wherein a booster pump 3 is provided between the water storage tank and the medium filter, and a first pressure gauge 5a and a second pressure gauge 5a are respectively installed on the water inlet and outlet pipes at both ends of the microfilter. Two pressure gauges 5b, a sampling port 7, a high pressure pump 8, a one-way valve 9, a ball valve 10 and a first flow meter 11a are arranged between the second pressure gauge 5b on the outlet pipe of the microfilter and the reverse osmosis device. A third pressure gauge 5c and a fourth pressure gauge 5d are res...

Embodiment 3

[0014] The relevant parameters of media filtration, MF, RO and NF are as follows:

[0015] parameter

[0016] parameter

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Abstract

The invention relates to a process for recovering the materials separated by a dye and pesticide wastewater reverse-osmosis and nanofiltration combined membrane, comprising the following steps that: the wastewater to be treated in a reservoir enters a medium filter after pressurization; the filtrate of the medium filter enters a microfilter; the filtrate of the microfilter enters a counter-osmosisdevice after the pressurization; a concentrated solution trapped by the counter-osmosis device enters a nanofilter for separation, dyes, pesticides and related intermediates are recovered from the flowed out liquid; and penetrating fluids of the counter-osmosis device and the nanofiler are mixed and collected. The process can be directly amplified in the engineering application; the membrane technology combined process is adopted to test active red printing and dyeing wastewater in a chemical plant, the rejection recovery rate of the dyes is more than 99.0 percent and the water yield flux after continuous operation of the membrane for four hours is more than 25L / (m<2>.h). The process is adopted to treat the imidacloprid and salicylal wastewater of an insecticide factory, the material recovery rate is more than 70 percent, the salt rejection is more than 90 percent, the removal rate of COD is more than 70 percent and the water productivity is more than 95 percent.

Description

1. Technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a membrane separation material recovery process and a device thereof using microfiltration (Micro filtration: MF), reverse osmosis (Reverse Osmosis: RO) and nanofiltration (Nano filtration: NF) technologies. 2. Background technology [0002] At present, there are many types of pollutants in the wastewater from the production of dyes and pesticides, including tens of thousands of intermediates in the production process. Dyes, pesticides and their intermediates have complex molecular structures, mostly containing active groups such as benzene ring, naphthalene, quinone, sulfonic acid group, azo group, hydroxyl group, carbonyl group, carboxyl group, nitro group and amine group. The molecular structure of the dye substance is stable, and its new products use anti-oxidation, anti-photochemical, and anti-biochemical as product quality indicators; the mo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F1/44
Inventor 张林生李月中杨青戴舒张显球杨广平沈剑斌
Owner SOUTHEAST UNIV
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