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Process for reducing ultrafiltration self-use water rate and improving recovery rate of produced water

A technology of water recovery rate and self-use water rate, which is applied in ultrafiltration, water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of large discharge water, difficult ultrafiltration drainage, and difficult reuse, and achieves Reduced wastewater discharge, reduced investment, and simple system

Inactive Publication Date: 2021-06-01
HUADIAN ELECTRIC POWER SCI INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The water used for normal backwashing, normal backwashing and enhanced backwashing is ultrafiltration private water. Normal backwashing is performed every 40 minutes, and enhanced backwashing is performed once after approximately 40 ordinary backwashes. The self-use water rate is 10%, the amount of discharged water is large, and it is difficult to reuse in the plant. Furthermore, because the backwash wastewater contains sodium hypochlorite and other substances, it is difficult to treat it. Ultrafiltration drainage has always been a difficult problem in the industry.

Method used

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  • Process for reducing ultrafiltration self-use water rate and improving recovery rate of produced water
  • Process for reducing ultrafiltration self-use water rate and improving recovery rate of produced water

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Effect test

Embodiment

[0022] see figure 2 , in the present embodiment, a kind of technology that reduces the self-use water rate of ultrafiltration and improves the recovery rate of produced water, the process flow is as follows: the drainage of the filtration system 1 includes positive washing drainage, common backwash wastewater and enhanced backwash wastewater, and the ultrafiltration system 1 drainage It is discharged through the ultrafiltration drainage pipe 2 at the bottom. The ultrafiltration drainage pipe 2 is divided into a drainage branch 1 21 and a drainage branch 2 22. The drainage branch 1 21 is connected to the waste water pool 1 4, and the drainage branch 2 22 is connected to the waste water pool 2. 5. Install valve 1 12 and valve 2 13 on drainage branch 1 21 and drainage branch 2 22 respectively, and the positive washing drainage and ordinary backwash wastewater are discharged to waste water pool 1 4 through drainage branch 1 21 to strengthen backwash wastewater Discharge to waste ...

Embodiment 2

[0025] A thermal power plant in Hebei, with a unit capacity of 2 units of 330MW, affected by environmental protection policies, the wastewater in the plant is strictly prohibited from being discharged outside. A water balance test was carried out in 2018, and the ultrafiltration backwash wastewater was about 22m 3 / h, there is no place to consume in the factory. At the end of 2018, the ultrafiltration backwashing system was transformed by using the present invention, and the backwash wastewater was separated and recovered, reducing the ultrafiltration wastewater to 4m 3 / h, when the waste water zero-discharge transformation is implemented, the investment is saved by about 5 million yuan.

Embodiment 3

[0027] A thermal power plant in Ningxia, with a unit capacity of 2 units of 660MW, affected by environmental protection policies, the ultrafiltration backwash wastewater is about 34m 3 / h, no place to consume, in 2018, it is planned to build a zero discharge system to treat the wastewater of the whole plant, and optimize the wastewater in the plant. After the transformation of the present invention at the end of 2019, the ultrafiltration backwash wastewater was reduced to 6m 3 / h, all recycled to the wet slag removal system and ash removal system.

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Abstract

The invention discloses a process for reducing the ultrafiltration self-use water rate and improving the recovery rate of produced water. Classified collection of ultrafiltration enhanced backwashing wastewater, common backwashing wastewater and conventional washing drainage is achieved by additionally arranging a wastewater pool and a corresponding pipeline valve. Common backwashing wastewater and conventional washing wastewater are treated by a two-stage self-cleaning filter and then are returned to the front of an ultrafiltration system to be used as ultrafiltration inlet water, so that the purpose of reducing the ultrafiltration self-use water rate is achieved. Ultrafiltration drainage mainly comprises conventional washing drainage, common backwashing wastewater and enhanced backwashing wastewater, ultrafiltration backwashing is divided into common backwashing and reinforced backwashing, the common backwashing wastewater is mainly characterized in that the content of suspended matter is high, and the common backwashing wastewater is treated to be qualified through the two-stage self-cleaning filter and then is recycled to ultrafiltration system inlet water; the enhanced backwashing wastewater is complex in component and high in salt content, and is recycled to other systems after being independently collected; and wastewater generated by the self-cleaning filter is recycled to other systems along with the reinforced backwashing wastewater. The system is simple, convenient to operate and low in operation and maintenance cost.

Description

technical field [0001] The invention relates to a process for reducing the self-water rate of ultrafiltration and improving the recovery rate of produced water. Background technique [0002] At present, ultrafiltration is the most common process in water treatment. The operation process is generally forward washing-running-backwashing-running. The purpose of forward washing before operation is to discharge the water that has stayed in the ultrafiltration equipment for a long time. Part of the water quality is better; backwashing is divided into ordinary backwashing and enhanced backwashing, ordinary backwashing wastewater has higher suspended solids; enhanced backwashing wastewater has complex components and higher dissolved solids content. The water used for positive washing, ordinary backwashing and enhanced backwashing is ultrafiltration private water. The ordinary backwashing is performed every 40 minutes, and the enhanced backwashing is performed once after about 40 ord...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/44B01D61/18B01D61/20B01D61/22B01D65/02B01D61/14
CPCC02F1/444B01D61/18B01D61/145B01D61/20B01D61/22B01D65/02B01D2313/18B01D2311/25
Inventor 王诗琴喻江
Owner HUADIAN ELECTRIC POWER SCI INST CO LTD
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