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A zero-outflow recycling water treatment device and treatment method thereof

A treatment device and a technology of quality separation and reuse, which are applied in water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. Problems such as difficult discharge and sewage treatment

Active Publication Date: 2021-07-06
CNOOC TIANJIN CHEM RES & DESIGN INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fouling and slime deposits cause the heat transfer efficiency of the heat exchanger to decrease, and the energy consumption increases. In severe cases, it will be forced to stop production and damage the equipment
[0004] At present, most of the circulating water and sewage reuse treatment systems that have been put into use adopt the "coagulation clarification + double membrane" (ultrafiltration + reverse osmosis) treatment process, but the high-salt reverse osmosis concentrated water produced by this process is difficult to discharge directly. Difficulties in sewage treatment of various enterprises

Method used

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  • A zero-outflow recycling water treatment device and treatment method thereof

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Experimental program
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Effect test

Embodiment 1

[0029] same figure 1 It is a structural schematic diagram of an embodiment of the present invention applied in a circulating water system.

[0030] The device of the recycling water zero efflux treatment method according to the present invention comprises a circulating water sump 1, a mixing device 2, a filter aid dosing system 15, a filtering device 3, a sewage pool 13, and a filter press 14. Nanofiltration device 4, nanofiltration retentate collection tank 5, nanofiltration filtrate collection tank 6, electrodialysis devices 7, 10, electrodialysis concentrated water collection tanks 8, 11, evaporation crystallizer 12, electrochemical treatment device 9 .

[0031] The filter aid dosing system 15 includes a chemical tank, a diaphragm metering pump, and a pipeline mixer. The filter aid and the sewage from the circulating water sump 1 enter the mixing device 2 after passing through the manifold of the pipeline mixer.

[0032] The filter device 3 is a secondary filter device, i...

Embodiment 2

[0044] The quality-based recycling treatment of circulating water with zero effluent is the same as that in Example 1. An enterprise's circulating cooling open circuit system, the conductance of circulating water and sewage is 1860μS / cm, Cl - About 320mg / L, total hardness 350mg / L, turbidity 13NTU, treated water volume 100m 3 / h.

[0045] The method adopted in this embodiment includes the following steps:

[0046] (1) Filter aid pretreatment: Discharge 100m of circulating water in the circulating water collection tank 1 3 / h and the filter aid 0.02mg / L polyaluminum chloride and 0.01mg / L polyacrylamide drawn from the filter aid dosing device 15 are added to the mixing device 2 through the pipeline mixer, and then passed through the filter device 3 through the multi-media Filter to remove impurities with a particle size of 10 μm or more in the sewage. Through a precision filter, remove impurities with a particle size of 5 μm or more to reduce suspended solids and turbidity in t...

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Abstract

The invention relates to a treatment device and a treatment method for recycling water with zero external discharge and quality separation. The treatment device of the present invention includes a circulating water collection tank, a mixing device, a filter aid dosing system, a filter device, a sewage tank, a filter press, a nanofiltration device, a nanofiltration filtrate collection tank, a nanofiltration retentate collection tank, an electrodialysis device, electrodialysis concentrated water collection tank, evaporation crystallizer and electrochemical treatment device. The treatment method of the present invention first adopts chemical filter aid, precipitation, filtration and other processes to carry out pretreatment for turbidity reduction and suspension removal, and then adopts nanofiltration separation and purification treatment process to realize salt separation treatment, and the obtained filtrate is concentrated and evaporated to obtain sodium chloride solid , After the nanofiltration retentate is treated by electrodialysis, the produced water is reused as circulating water, and the concentrated brine is subjected to electrochemical hardness reduction and sterilization, and the produced water is reused. The invention can effectively reduce the salt content of circulating water, solve the scaling and corrosion problems caused by excessively high ion concentration in the circulating water system, and at the same time realize efficient salt separation treatment and resource recovery and reuse.

Description

technical field [0001] The invention belongs to the technical field of circulating water treatment, and in particular relates to a treatment device and a treatment method thereof for zero-outflow, quality-separation and reuse of circulating water. Background technique [0002] The circulating water system is one of the indispensable energy media for the production of metallurgical, energy and chemical enterprises, and it is the device with the largest water consumption in industrial enterprises. At present, the supplementary water of circulating cooling water generally accounts for about 70% of the fresh water used in industry, and its water consumption is large and stable. Circulating water sewage is high-calcium, high-alkali, and high-salt wastewater, and it is an effective way for enterprises to save energy, reduce emissions, and reduce fresh water consumption. [0003] In the open circulating cooling water system, the circulating water is concentrated through the contin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10
CPCC02F1/001C02F1/048C02F1/442C02F1/4693C02F1/50C02F1/5236C02F1/56C02F5/00C02F9/00
Inventor 滕厚开陶蕾朱安民王惠秦立娟王宁姚光源
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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