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Treatment method and device for high-concentration organic wastewater

A technology of organic wastewater and treatment methods, applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, separation methods, etc., can solve the problems of high aerobic load, low anaerobic efficiency, and high cost, and achieve reduction Organic content, inhibition of sludge bulking, and compact structure

Inactive Publication Date: 2013-02-06
GUANGXI UNIV
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Problems solved by technology

[0013] The above-mentioned publications have reported some industrial wastewater treatment methods, but for some high-concentration organic wastewater, such as food production wastewater, starch wastewater and pharmaceutical industry wastewater, such as Alcohol waste liquid, etc., due to the high viscosity, it is difficult to use a simple electrodialysis method, and the biochemical method is used alone for treatment, and because there are many salts such as sulfate ions and potassium ions in the waste water, the anaerobic efficiency is low and good The oxygen load is too high, which makes the cost of biochemical treatment of these wastewaters high and the effect is poor

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Embodiment 1

[0073] Example 1: The molasses yeast wastewater of a sugar company in Guangxi has a COD of about 5500 mg / L, a total salt content of about 6000 mg / L, and a potassium ion content of about 540 mg / L. The wastewater has poor biochemical properties. After processing on a small scale in the laboratory, since there is no obvious peak on the desalination trend graph in the single-factor experiment stage, the orthogonal experiment design method is used to design the experiment, and the best combination of desalination parameters obtained is: flow rate 30L / h, voltage 60V , the pH value is 7. Under this optimal combination, the desalination rate reached 89.6%, and the BOD5 / COD value of molasses yeast wastewater after electrodialysis treatment rose from 0.293 of raw water to 0.477, and the biochemical properties of wastewater were significantly improved. The treated desalinated liquid is reused after anaerobic treatment and aerobic treatment, and the concentrated liquid is re-concentrate...

Embodiment 2

[0074] Example 2, a paper mill in Guangxi produced washing wastewater containing a large amount of pollutants such as inorganic salt ions and cellulose during the pulp washing stage. In the past, although the electrodialysis treatment system was used, because it only considered the influence of inorganic salt ions in the wastewater and did not consider other conditions, it was difficult to discharge the washing wastewater to meet the standard. Using the process method of the present invention, it is firstly desalted by electrodialysis, and then After two-stage anaerobic-aerobic treatment or using an upflow anaerobic sludge bed reactor, the process parameters can be optimized to the greatest extent under limited conditions. After three months of testing, all emission indicators are qualified.

Embodiment 3

[0075] Example 3, a breeding factory in Guangxi adopts mariculture, and the discharge of wastewater is relatively large. In the past, although biological treatment was used, the effect of biological treatment was not very satisfactory because only the high organic matter in the aquaculture wastewater was considered. After adopting the method of the present invention, it is desalinated by electrodialysis and then undergoes two-stage anaerobic-aerobic treatment. The aerobic treatment adopts an intermittent activated sludge device, which can realize the maximum optimization of process parameters under limited conditions. Test 3 Months, the emission indicators are all qualified.

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Abstract

A treatment method for high-concentration organic wastewater is characterized in that first electrodialysis desalination and concentration treatment is adopted and then a comprehensive method of biochemical treatment is adopted, wherein the electrodialysis desalination and concentration treatment is that treated recycle water flows back into an adjusting tank to dilute raw water and then enters an electrodialysis treatment device; and in the electrodialysis treatment device, inorganic salt is separated out, relatively ropy solid is filtered by an ultrafiltration membrane, the separated out inorganic salt can be used independently or enters a concentration tank together with the solid filtered by the ultrafiltration membrane to be heated, concentrated and dried to obtain an organic compound fertilizer product. Besides, desalted water with higher COD contend and BOD content is obtained through the electrodialysis and is subjected to anaerobic treatment and aerobic treatment in sequence; and when the COD contend and the BOD content of the obtained water meet the requirements, part of the obtained water is used as recycle water to dilute high-concentration organic wastewater, and the other part of the obtained water is discharged or used as cooling water for production.

Description

technical field [0001] The invention relates to an industrial wastewater treatment method, in particular to a method and a device for treating high-concentration organic wastewater by electrodialysis combined with anaerobic and aerobic methods. Background technique [0002] The high-concentration organic wastewater we see every day includes: food production wastewater, pharmaceutical production wastewater, starch wastewater and waste paper mills, etc. These high-concentration organic wastewater have very high BOD and COD values ​​due to their high viscosity. If a single treatment is used Methods, such as single bacterial method, anaerobic method, aerobic method, filtration method, concentration method, etc. are difficult to reach the standard. [0003] In recent years, it has been found that the electrodialysis method has a better effect in treating industrial wastewater. The electrodialysis method is used to treat industrial wastewater, mainly using anion and cation exchang...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/469
CPCY02A20/124
Inventor 陈仁义王英辉张俊黄闻宇张金莲冷冰
Owner GUANGXI UNIV
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