Method for treating high salinity wastewater

A technology of high-salt wastewater and treatment method, which is applied in the fields of water/sewage multi-stage treatment, heating water/sewage treatment, neutralized water/sewage treatment, etc. and other problems, to achieve the effect of reducing membrane pollution, solving the problem of fast flux decay rate and good water quality

Active Publication Date: 2010-12-29
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

At the same time, because the theoretical water production rate of reverse osmosis is only 75%, the actual water production rate is less than 70%, and more than 30% of the concentrated brine cannot be effectively reused and discharged directly, wasting a lot of precious water resources
Due to the high hardness of high-salt wastewater, as the concentration ratio increases, the membrane fouling produced during the membrane distillation process is more serious; and due to the membrane fouling, the concentration ratio of wastewater is limited, which increases the load of subsequent evaporation treatment

Method used

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  • Method for treating high salinity wastewater
  • Method for treating high salinity wastewater
  • Method for treating high salinity wastewater

Examples

Experimental program
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Effect test

Embodiment 1～4

[0027] (1) Add NaOH and Na to reverse osmosis concentrated water 2 CO 3 , adjust its pH to 10.8 (NaOH addition is 800mg / L, NaOH 2 CO 3 Addition amount is 300mg / L), after precipitation, carry out solid-liquid separation to remove calcium, magnesium hardness of waste water, removal effect is: total hardness removal 73%, calcium hardness removal 93%, magnesium hardness removal 39%;

[0028] (2) Submerged microfiltration treatment is used to remove turbidity and SS in wastewater. An aeration system is installed at the bottom of the microfiltration tank to reduce membrane surface pollution through aeration and shaking of membrane filaments; Hollow fiber membrane, the operating pressure of the microfiltration treatment is -0.008MPa, the operating temperature is 20°C, the pH is 10.8, and the permeation flux of the microfiltration membrane is 45-55L / m 2 h, after treatment, turbidity and SS are basically completely removed;

[0029] (3) In order to prevent unremoved calcium and mag...

Embodiment 5

[0036] Add NaOH to reverse osmosis concentrated water (addition amount 2000mg / L), adjust its pH to 11.3, and remove calcium and magnesium hardness in wastewater. The removal effect is: 97% of total hardness removal, almost all calcium hardness removal, and magnesium hardness removal 95%;

[0037] Other treatment processes are the same as in Example 1. The unit operating conditions of the vacuum membrane distillation treatment are shown in Table 4, and the treatment effects are shown in Table 5.

[0038] Table 4

[0039]

[0040] table 5

[0041]

[0042] Membrane distillation is performed on the reverse osmosis concentrated water pretreated by "alkali adjustment and hardness removal + microfiltration + neutralization", which can run continuously and stably for about 15 to 25 days, and the conductance of membrane distillation water can be kept within 4μS / cm , the desalination rate is higher than 99%, and the flux is always maintained at 5-20L / m during operation 2 · Withi...

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Abstract

The invention relates to a method for treating high salinity wastewater. The invention uses treatment processes of alkali regulation and hardness removal, immersed microfiltration, neutralization and membrane distillation, aiming at the high salinity wastewater in petrifaction enterprises. The immersed microfiltration solves the problems of easy blocking, rapid flux decline rate and the like of a membrane; and the alkali regulation and hardness removal effectively removes the hardness in wastewater, reduces membrane pollution, improves the concentration multiple of the membrane distillation, lowers the load of evaporation and improves the processing effect and the operation stability of the membrane distillation. The method of the invention has wide applicability, simple device, convenient operation, stable operation and the like, and water produced by membrane distillation is good in water quality and can be directly reused for production.

Description

technical field [0001] The present invention relates to a method for treating waste water, more specifically, a method for treating and reusing high-salinity waste water, which is suitable for the treatment of high-salinity waste water such as reverse osmosis concentrated water and circulating water sewage produced by petrochemical enterprises Reuse process. Background technique [0002] For a long time, my country's environmental protection field has been paying attention to the pollution of high-concentration and refractory organic wastewater, ignoring the pollution control of high-salinity wastewater, and the pollution of high-salinity wastewater has become increasingly prominent. [0003] At present, with the rapid development of chemical industry, metallurgy and other industries and urban construction, in order to save and utilize water resources, industrial wastewater and urban sewage are mostly treated with reverse osmosis technology and reused. The resulting reverse ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F1/66C02F1/44C02F1/04
Inventor 赵鹏刘正张新妙栾金义
Owner CHINA PETROLEUM & CHEM CORP
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