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Treatment method of coal-containing wastewater in coal yard

A treatment method and technology for wastewater treatment, applied in multi-stage water treatment, water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of small scale of treatment process, unstable operation of treatment system, and lack of mature coal yard. Coal-containing wastewater treatment technology and other issues, to achieve the effect of not easy secondary pollution, easy operation and maintenance

Inactive Publication Date: 2018-09-21
HUATIAN ENG & TECH CORP MCC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above-mentioned defects, the present invention mainly aims at the problems that the current traditional treatment process for coal-containing wastewater is too small, the operation of the treatment system is unstable, and especially the lack of mature coal-containing wastewater treatment technology in coal yards, and provides a method for treating coal-containing wastewater in coal yards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0036] In this example 1, the coal-containing wastewater from the coal yard enters the wastewater collection ditch through the surface runoff. The wastewater collection ditch is circular around the coal yard, and the slope of the ditch is designed to be 3‰; the collected coal-containing wastewater flows into the primary sedimentation tank through the wastewater collection ditch. Primary sedimentation, the sedimentation time is 2h; the effluent of the primary sedimentation tank overflows through the drop weir into the primary coagulation sedimentation tank, and the drop height of the drop weir of the primary sedimentation tank is 1.5m; add flocculant at the drop weir AlCl3, its mass concentration is 10%, and the dosage is 15L / m3; the coagulant aid PAM is added, its mass concentration is 5%, and the dosage is 10L / m3; the hydraulic retention time of the primary coagulation sedimentation tank is 0.5h; the effluent of the primary flocculation reaction sedimentation tank overflows in...

example 2

[0039]In this example 2, the coal-containing wastewater from the coal yard enters the wastewater collection ditch through surface runoff. The wastewater collection ditch is circular around the coal yard, and the slope of the ditch is designed to be 5‰; the collected coal-containing wastewater flows into the primary sedimentation tank through the wastewater collection ditch. Primary sedimentation, the sedimentation time is 4h; the effluent of the primary sedimentation tank overflows through the drop weir into the primary coagulation sedimentation tank, the drop height of the drop weir of the primary sedimentation tank is 2m; add flocculant polymerization at the drop weir Aluminum chloride (PAC), its mass concentration is 25%, and the dosage is 20L / m3; the coagulant aid PAM is added, its mass concentration is 20%, and the dosage is 20L / m3; the primary coagulation sedimentation tank The hydraulic retention time is 1h; the effluent of the primary flocculation reaction sedimentation...

example 3

[0042] In Example 3, the coal-containing wastewater from the coal yard enters the wastewater collection ditch through surface runoff. The wastewater collection ditch is circular around the coal yard, and the slope of the ditch is designed to be 3.5‰; the collected coal-containing wastewater flows into the primary sedimentation tank through the wastewater collection ditch. Primary sedimentation, the sedimentation time is 2.5h; the effluent of the primary sedimentation tank overflows into the primary coagulation sedimentation tank through the drop weir, and the drop height of the drop weir in the primary sedimentation tank is 1.7m; add flocculation at the drop weir Agent AlCl3, its mass concentration is 15%, and the dosage is 18L / m3; the coagulation aid PAM is added, its mass concentration is 8%, and the dosage is 12L / m3; the hydraulic retention time of the primary coagulation sedimentation tank 0.8h; the effluent of the primary flocculation reaction sedimentation tank overflows ...

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Abstract

The invention discloses a treatment method of coal-containing wastewater in a coal yard and belongs to the technical field of industrial wastewater treatment. The method comprises the following steps:enabling the coal-containing wastewater to flow into a primary sedimentation pool to be subjected to primary sedimentation; enabling the water overflowing from the primary sedimentation pool to entera multi-stage coagulating sedimentation pool to be subjected to coagulation; and collecting the water overflowing from the coagulating sedimentation pool for later use. The method disclosed by the invention has the advantages that the discharged water meets the discharge standards specified by DL / T997-2006, thereby economically and effectively solving the problem of pollution to natural water caused by discharge of a large amount of coal-containing wastewater in the coal yard in a rainy season; and furthermore, the discharged water can meet the water recycling requirements for coal injectionand ground washing, thereby reducing the water utilization cost.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and more specifically relates to a treatment method for coal-containing wastewater in coal yards. Background technique [0002] Coal-containing sewage is an important part of sewage in coal-fired thermal power plants. It mainly comes from the following sources: flushing water from coal delivery trestles, transfer stations, coal bunkers in main workshops, and rainwater from coal yards. Because the quality of its treatment does not directly affect the production and power generation, it has not been paid enough attention by people for a long time. Judging from the operating conditions of domestic power plants, coal-containing sewage has always lacked an effective, economical and reasonable treatment method. [0003] The traditional coal-containing wastewater treatment process is as follows: [0004] Coal-containing wastewater→coal water regulation pre-sedimentation tank→co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F1/56
CPCC02F1/5245C02F1/56C02F2001/007C02F2301/08
Inventor 李明慧程寒飞詹茂华龙玉娇韩飞超
Owner HUATIAN ENG & TECH CORP MCC
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