Treatment method and treatment device of discharge water of cooling water

A treatment device and treatment method technology, which is applied in the direction of flocculation/sedimentation water/sewage treatment, osmosis/dialysis water/sewage treatment, etc., can solve problems such as difficult cleaning and blockage, and achieve the purpose of suppressing flux reduction, long-term continuous stability and effective Effect of treatment

Active Publication Date: 2014-01-15
KURITA WATER INDUSTRIES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] However, the particle size of the ultrafine particles in the cooling water discharge water is close to the pore size of the UF membrane. Therefore, these ultrafine particles may be embedded in the pores of the UF membrane to cause clogging, which is difficult to clean.

Method used

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  • Treatment method and treatment device of discharge water of cooling water
  • Treatment method and treatment device of discharge water of cooling water
  • Treatment method and treatment device of discharge water of cooling water

Examples

Experimental program
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Embodiment

[0114] Hereinafter, the present invention will be described more specifically by giving examples, reference examples, and comparative examples.

[0115] [evaluation sample]

[0116] In the following examples, reference examples, and comparative examples, the following evaluation sample waters 1 and 2 were used as raw water to be treated.

[0117]

[0118] As evaluation sample water 1, the discharge water of the cooling water of A petrochemical complex plant was collected.

[0119] The cooling water treatment of this factory is treated with non-phosphorus polymer-based dispersant and the concentration factor is 4 times. The water quality of the collected cooling water discharge water is shown in Table 1.

[0120]

[0121] As evaluation sample water 2, the discharge water of the cooling water of Plant B of the Petroleum Complex was collected.

[0122] The cooling water treatment of this factory is treated with non-phosphorus polymer-based dispersant and the concentration f...

Embodiment 10、12～14

[0180] Set the maximum turbidity increase of the cationic organic coagulant to 100%, and set the addition amount of the cationic organic coagulant with an intrinsic viscosity of 0.5dL / g or less so that the turbidity increase rate becomes 50-90%. When 10 to 30 ppm, preferably 20 ppm of PAC is added, the SDI conversion value of filtered water is 3.50 to 4.76, which is judged to be substantially good.

[0181] When the turbidity increase rate is about 70%, the addition amount of the cationic organic coagulant shows the best results, and the effect decreases when the turbidity increase rate is close to 50% and close to 90%.

[0182] The cationic organic coagulant having a larger turbidity increase tends to have a larger absolute effect.

[0183] (4) Comparative examples 1-3, 5-9

[0184] Based on the addition of cationic organic coagulants whose turbidity increase rate is less than 50% and more than 90%, the fouling of the reverse osmosis membrane will be increased. When the tur...

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PUM

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Abstract

When agglutination treatment and filtration treatment are adopted as a pretreatment system of reverse osmosis membrane separation treatment to recycle water, excellent reverse osmosis water supply is obtained through reduction of demand of inorganic agglutinants in the agglutination treatment, and treatment which is continuously stable and effective for a long time is performed. Positive ion series organic agglutinants and inorganic agglutinants whose intrinsic viscosity is lower than 0.5 dL / g are added in the discharge water of cooling water, so as to perform agglutination treatment. In the agglutination treatment of the discharge water of the cooling water, through combining use of the positive ion series organic agglutinants and inorganic agglutinants, excellent reverse osmosis water supply is obtained on the basis that the demand for the inorganic agglutinants is reduced.

Description

technical field [0001] The present invention relates to a treatment method and device for cooling water discharge, in particular to the improvement of the pre-treatment process when using reverse osmosis membrane (RO membrane) separation method to recover water from the cooling water discharge. Background technique [0002] In recent years, water recovery from sewage and factory effluents has been promoted in countries where the demand and supply of water are in short supply. In particular, in petrochemical complexes that use a large amount of cooling water, since the amount of discharged cooling water is large, water recovery is also performed on the discharged water. [0003] Conventionally, reverse osmosis membrane separation treatment is generally used in the treatment of cooling water discharge water. For example, Patent Document 1 proposes a method of performing reverse osmosis membrane separation treatment after filtering cooling water discharge water. In addition, P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F1/44
Inventor 大井康裕
Owner KURITA WATER INDUSTRIES LTD
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