Treatment method for zero discharge of high-hardness high-salinity wastewater

A treatment method and high-salt technology, applied in the field of water treatment, can solve the problems of inability to achieve high-level reuse and zero discharge, achieve the effects of improving recycling rate, stabilizing effluent water quality, and solving environmental pollution

Active Publication Date: 2015-02-25
ZHEJIANG CREATION ENVIRONMENT TECH
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Problems solved by technology

The invention patent with the application number 201210534825.2 discloses a method of combining biochemistry and physicochemistry to treat high-hardness and high-salt wastewater, but it still cannot meet the requirements of advanced reuse and zero discharge

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  • Treatment method for zero discharge of high-hardness high-salinity wastewater

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Embodiment Construction

[0021] Combine below figure 1 The present invention will be further described with specific embodiments.

[0022] A zero-discharge treatment method for high-hardness and high-salt wastewater, using such as figure 1 The device shown comprises the following steps:

[0023] 1) The high-hardness wastewater discharged by the paper mill meets the standard, the main water quality indicators are COD=60-80mg / L, hardness=800-1000, conductivity=5000-6000uS / cm, and the hardness and suspended solids are reduced by the first-stage pretreatment device 1 Content and COD pretreatment, the pretreatment device in the first section adopts pretreatment multi-media filter 19, coagulation and dosing slant plate sedimentation, and ozone treatment combination. After pretreatment, the main water quality indicators reach: COD=30mg / L, hardness= 200;

[0024] 2) The wastewater pretreated in step 1) enters the ultrafiltration device 2 of the first section and the reverse osmosis device 4 of the first se...

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Abstract

The invention relates to the technical field of water treatment, and particularly relates to and discloses a treatment method for zero discharge of high-hardness high-salinity wastewater. The method comprises the steps of pretreating; ultrafiltering in a first section; carrying out reverse osmosis treatment in the first section; carrying out enhancing treatment on reverse osmosis concentrate in the first section; filtering by multiple mediums, softening, and ultrafiltering and carrying out reverse osmosis treatment in a second section; passing the reverse osmosis concentrate in the second section through a nano-filtration device; passing nano-filtration permeate through an electrodialysis device; introducing fresh water generated by the electrodialysis device into ultrafiltration water of the second section, and taking concentrate in the electroldialysis device for regenerating a softener; feeding nano-filtration concentrate into an evaporation system to obtain a solid matter, and taking water in reverse osmosis treatment of the first and second sections as reuse water. According to the treatment method for zero discharge of high-hardness high-salinity wastewater, physicochemical treatment, membrane integration technology and evaporation technology are combined, so that the problem that the environment is polluted by high-hardness high-salinity concentrate discharge can be effectively solved, the requirement for zero discharge can be met, the effluent water quality is stable, and the water utilization rate is improved.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a zero-discharge treatment method for high-hardness and high-salt wastewater. Background technique [0002] Salt wastewater, especially industrial wastewater with high hardness, has complex components and is therefore difficult to treat. Such as papermaking, printing and dyeing, citric acid and other industries, due to the specific requirements of the production process, the salinity and hardness of the discharged wastewater are relatively high, which increases the difficulty of treatment. These industries are large water users, and there are two main treatment methods for their production wastewater. One is to discharge directly after traditional physical, chemical and biochemical treatment. The organic matter and high salt in the saline wastewater have a greater impact on the environment; Partial reuse is achieved through membrane treatment, thereby reducing water cons...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10
CPCC02F1/04C02F1/048C02F1/42C02F1/441C02F1/442C02F1/444C02F1/4693C02F1/72C02F9/00
Inventor 洪海云包进锋
Owner ZHEJIANG CREATION ENVIRONMENT TECH
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