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Reverse osmosis membrane treating and recycling method for printing and dyeing wastewater

A technology for reverse osmosis membrane, printing and dyeing wastewater, applied in water/sewage treatment, water treatment parameter control, special compound water treatment, etc. It can improve the recycling rate, avoid the collapse of the biological treatment system, and solve the problem of meeting the emission standards.

Inactive Publication Date: 2016-03-23
NINGBO QINGSHUIYUAN WATER TECH
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Problems solved by technology

However, the invention uses a nanofiltration membrane to treat reverse osmosis concentrated water, and there is a problem that the nanofiltration membrane is easily polluted; in addition, the COD of the effluent after treatment may not be able to reach below the discharge limit, and there are external The risk of excessive emission, because the removal rate of COD by ozone oxidation is not very high

Method used

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  • Reverse osmosis membrane treating and recycling method for printing and dyeing wastewater

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Embodiment Construction

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0028] like figure 1 Shown is the flowchart of the present invention,

[0029] A reverse osmosis membrane treatment and reuse method for printing and dyeing wastewater, comprising the following steps:

[0030] Step 1. Adsorption reaction: Take the effluent from the printing and dyeing wastewater treatment system, enter the adsorption pool for adsorption reaction, remove the organic matter in the wastewater, and obtain the adsorbed effluent; the adsorption pool uses multiple reaction pools to operate in parallel. When the saturation fails, take it out for dehydration, and enter the regeneration equipment for regeneration and reactivation.

[0031] The adsorption material in the adsorption pool is granular activated carbon, and the natural loss of each regeneration of granular activated carbon is 5-10%.

[0032] The adsorption material can al...

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Abstract

The invention discloses a reverse osmosis membrane treating and recycling method for printing and dyeing wastewater. According to the method, adsorption, ultrafiltration membrane filtration, macroporous resin adsorption and reverse osmosis membrane separation are conducted on water discharged from a printing and dyeing wastewater treatment system, reverse osmosis membrane produced water is taken as high-quality water to be used by enterprises for cyclic utilization, and after advanced oxidation reaction, part of reverse osmosis membrane concentrated water is for up-to-standard release and the other part is adsorbed and then reused for rinsing. The method has the advantages that deep wastewater treatment for up-to-standard release and reusing are combined organically, the total reuse rate of printing and dyeing wastewater is over 80%, the problem of up-to-standard release of wastewater is solved, and cost is reduced greatly due to the remarkable increase of the water reuse rate; part of reverse osmosis membrane concentrated water is for up-to-standard release and the other part is reused after being treated, saltness of wastewater tends to be a stable value gradually and does not increase any more, and crash of a biological treatment system caused by non-stop increase of saltness is effectively avoided.

Description

technical field [0001] The invention relates to the technical field of printing and dyeing wastewater treatment, in particular to a reverse osmosis membrane treatment and reuse method for printing and dyeing wastewater. Background technique [0002] my country is the world's largest printing and dyeing country, and its output of printed and dyed cloth accounts for more than 35% of the world's total. However, the printing and dyeing industry is also a major water polluter. As my country's environmental standards become increasingly stringent, the requirements for printing and dyeing wastewater discharge are getting higher and higher. As early as 2007, Jiangsu Province promulgated the "Discharge Limits of Main Water Pollutants from Urban Sewage Treatment Plants and Key Industries in the Taihu Lake Area" (DB32 / 1072—2007), which stipulated that the COD of the discharge standard for printing and dyeing wastewater in the Taihu Lake Basin was 60mg / L . The "Water Pollutant Discharg...

Claims

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Application Information

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IPC IPC(8): C02F9/04
CPCC02F9/00C02F1/281C02F1/285C02F1/441C02F1/444C02F1/72C02F1/78C02F2209/08C02F2305/026C02F2305/10
Inventor 周宇松刘全利刘正伟郭海林石申刘中亲金少波
Owner NINGBO QINGSHUIYUAN WATER TECH
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