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Biological treatment method and treatment device for amine-containing waste water

A biological treatment and ultra-pure water technology, applied in the direction of sustainable biological treatment, biological water/sewage treatment, water/sewage treatment, etc., can solve the problems of unstable and variable treatment, and achieve the effect of stable and efficient treatment

Active Publication Date: 2014-03-19
KURITA INDUSTRIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, at the start of operation or when there is an extreme change in drainage composition or drainage load, etc., the pH value of the liquid in the biological treatment tank may change greatly, and the treatment may become unstable.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0045] Hereinafter, the present invention will be described more specifically by giving experimental examples, examples, and comparative examples.

[0046] In the following experimental examples, examples and comparative examples, in the amine-containing organic drainage from the ultrapure water recovery system of the liquid crystal factory of the following water quality, in the water with a pH value of 9.5 after adding nutrient salts as shown below, add Sulfuric acid adjusts the water to pH 7.5, which is treated as raw water.

[0047]

[0048] TOC value: 103mg / L

[0049] Main ingredient: Monoethanolamine

[0050] Other ingredients: N-methylformamide, TMAH, etc. (the total of monoethanolamine, N-methylformamide and TMAH is more than 90% of the total TOC value)

[0051] In addition, the above-mentioned organic waste water hardly contains P, Ca, K, Mg, Na, S, etc. Therefore, disodium phosphate and monopotassium phosphate are added so that the total amount added in conversion o...

experiment example 1

[0053] The 3 L aeration tanks are discharged in series, and each aeration tank is filled with 20% by volume of 10mm square polyurethane sponge carrier to form a biological treatment device, which is used for biological treatment of raw water. Install pH meters in the first aeration tank (the first-stage aeration tank) and the third aeration tank (the third-stage aeration tank), and add 1N NaOH aqueous solution when the measured value of the pH meter drops to 7.0 . All the 3 tanks are ventilated to make it 3vvm, a small amount of biological sludge from the waste water of the purification tanks in other locations is added, and the raw water is continuously passed into the 3 aeration tanks to start treatment. The residence time in the aeration tank was 3 hours each, and the total was 9 hours.

[0054] As a result, the TOC value (soluble TOC value) of the treated water (the effluent water of the third aeration tank) on the second day after the start of the treatment was 50 mg / L, ...

Embodiment 1

[0065] Install a pH meter in the first aeration tank and the third aeration tank, and set that when the measured value of the pH meter exceeds 8, 1N H will be automatically added to each aeration tank. 2 SO 4 Aqueous solution, continue to carry out the processing of comparative example 1.

[0066] As a result, the TOC value of the treated water became 5 mg / L or less after 3 days, and the ammoniacal nitrogen concentration of the treated water also became 1 mg / L or less after one week.

[0067] Therefore, the load rises to 3 times. As a result, after 5 days from the load increase, the TOC value of the treated water was 5 mg / L or less, and the ammoniacal nitrogen concentration of the treated water was 1 mg / L or less, and the situation was stable. After that, the treatment did not deteriorate.

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Abstract

In biological treatment of amine-containing waste water, which is organic waste water in an ultrapure water recovery system, the treatment during fluctuating conditions is stabilized and stable treatment is carried out at the start of operation, and during fluctuating load and waste water composition. A method for introducing amine-containing waste water, which is organic waste water in an ultrapure water recovery system, to a biological treatment tank to carry out biological treatment, wherein an acid is added to the biological treatment tank on the basis of the pH value of the liquid in the biological treatment tank. When amine-containing waste water, which is organic waste water in an ultrapure water recovery system, is to be biologically treated, an increase is detected in the pH of the liquid in the biological treatment tank caused by ammonia generated by amine oxidation, and an acid is added to the biological treatment tank in accordance with the pH value, whereby the liquid in the biological treatment tank can be adjusted to an optimal pH value. Therefore, stable and efficient treatment can be carried out without a reduction in the activity of the biological treatment, even during operation startup, or during fluctuating waste water composition or waste water load.

Description

technical field [0001] The invention relates to a method and a device for biologically treating amine-containing organic drainage from an ultrapure water recovery system. Background technique [0002] From the perspective of the manufacturing process of semiconductors, liquid crystals, plasma displays, etc., as the organic waste water of the ultrapure water recovery system, amine-containing waste water is discharged, and the amine-containing waste water contains various amines such as ethanolamine, and contains N-methylformamide , tetramethylammonium hydroxide (TMAH) and other alkali components. As the biological treatment method of these amine-containing wastewater, activated sludge method (AS), membrane separation activated sludge method (MBR), fluidized bed biological treatment method (FB), etc. can be applied. In either case, in order to neutralize the alkaline components in the wastewater and adjust the pH to 6.5 to 7.5, which is suitable for biological treatment, a pH...

Claims

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Application Information

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IPC IPC(8): C02F3/12
CPCC02F3/12C02F1/66C02F2101/38C02F2103/04Y02W10/10C02F1/58
Inventor 小野德昭深濑哲朗
Owner KURITA INDUSTRIAL CO LTD
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