Treatment method for salt-containing wastewater

A technology of salty wastewater and treatment methods, applied in the directions of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of increasing sewage treatment costs, secondary pollution, and low desulfurization efficiency, etc. problems, to achieve the effect of improving industrial water utilization, saving treatment costs, and good treatment effects

Active Publication Date: 2014-12-24
SHANDONG SUNWAY PETROCHEMICAL ENGINEERING CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods have disadvantages: the antiscalant and bactericide added to the concentrated water before the reverse osmosis treatment can inhibit the biochemical system; the conventional physical and chemical methods such as flocculation and filtration have unsatisfactory effects; Distillation only separates and transfers pollutants from water, but does not really remove pollutants; activated carbon adsorption treatment is costly and economically unfeasible
The disadvantage is that the added catalyst contains a large amount of metal ions, and because the pH value required by the oxidation reaction is low, it may cause the dissolution of heavy metal ions and form secondary pollution; in addition, the addition of oxidants and catalysts greatly improves sewage treatment. the cost of
The disadvantages are: no removal effect on the salt content in wastewater; no catalyst involved in the oxidation process, the efficiency is greatly reduced, the amount of oxidant is large, and the treatment cost increases
Due to the low desulfurization efficiency of the circular semi-dry method and the large amount of solid waste generated, it is difficult to meet the increasingly stringent environmental protection requirements, and the application is less and less

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  • Treatment method for salt-containing wastewater

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Effect test

Embodiment 1

[0047] 1.4 million tons / year catalytic cracking unit in an oil refinery, with a flue gas volume of 150,000 NM 3 / h, temperature 200℃, adopt wet flue gas desulfurization technology, 20t / h reverse osmosis concentrated water enters cooling water washing tower, adopts figure 1 The process flow shown, its operating conditions are as follows:

[0048] After the reverse osmosis concentrated water reacts in the cooling water washing tower for 2 minutes, it enters the oxidation flocculation tank for aeration and oxidation. The volume ratio of air to water is 3:1, the addition amount of flocculant polyaluminum chloride is 9 mg / L, and the residence time is 20 minutes. .

[0049] The reverse osmosis concentrated water enters the neutralization and sedimentation tank from the oxidation flocculation tank, and sodium hydroxide is added to adjust the pH to 7.5, and the residence time is 30 minutes. After precipitation, the inclined plate enters into a multi-media filter with coal and quartz s...

Embodiment 2

[0054] 1.4 million tons / year catalytic cracking unit in an oil refinery, with a flue gas volume of 150,000 NM 3 / h, the temperature is 200 °C, the wet flue gas desulfurization technology is used, and the 40 tons / hour reverse osmosis concentrated water, circulating water sewage, reclaimed reverse osmosis concentrated water, electrodialysis concentrated water and other salty wastewater are mixed. Water is used as the process water of the washing tower, using figure 1 The process flow shown, its operating conditions are as follows:

[0055] After the reverse osmosis concentrated water reacts in the cooling water washing tower for 5 minutes, it enters the oxidation flocculation tank, and the oxidant ozone is added at 40 mg / L, the flocculant polymerized iron sulfate is added at 9 mg / L, and the residence time is 10 minutes.

[0056] The wastewater enters the neutralization and sedimentation tank from the oxidation flocculation tank, and potassium hydroxide is added to adjust the pH...

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Abstract

The invention relates to a treatment device and a treatment method for salt-containing wastewater. The treatment device comprises a pump, a cooling and water-washing tower, an oxidation and flocculation pool, a precipitation pool, and a filter, wherein the salt-containing wastewater enters in the cooling and water-washing tower of a wet-method flue gas desulfurization device and adequately contacts with sulphur dioxide-containing flue gas to react at first, and then is subjected to the subsequent treatments of oxidation, flocculation, neutralization, precipitation, filter and the like; the treated wastewater can be used as replenishing water for circulation water or be discharged up to the standards. Compared with the prior art, the method disclosed by the invention is wider in sewage application range, as well as capable of effectively reducing the hardness, COD (chemical oxygen demand) and turbidity of the salt-containing wastewater, reducing industrial water, increasing the utilization rate of the industrial water, and achieving the effects of saving water and reducing discharge.

Description

technical field [0001] The invention relates to a method for treating salt-containing wastewater, in particular to a method for treating salt-containing wastewater such as reverse osmosis concentrated water and circulating water drainage sewage. Background technique [0002] my country is one of the countries with serious shortage of water resources. The development of industrialization, the severe shortage of water resources and the deterioration of water environment have become important factors restricting my country's economic and social development. With the in-depth development of "water saving and emission reduction", the rational use of sewage recycling technology can not only save a lot of water resources, but also greatly reduce the discharge of sewage, which is of great significance to the sustainable development of the economy. [0003] In industrial enterprises, some users who have high requirements for salts in water often use electrodialysis, reverse osmosis, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04
Inventor 张伟
Owner SHANDONG SUNWAY PETROCHEMICAL ENGINEERING CO LTD
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