Coal-bearing wastewater treatment system and process

Abstract

The invention relates to a coal-bearing wastewater treatment system and process. A filtering device in the coal-bearing wastewater treatment system comprises a middle pool, a first filter, a second filter, a first middle water pump, a second middle water pump, a first filtering pipeline, a second filtering pipeline, a third filtering pipeline, a fourth filtering pipeline and a fifth filtering pipeline; a coal water precipitation device is communicated with the middle pool, one end of the first filtering pipeline and one end of the second filtering pipeline are both located in the middle pool,one end of the third filtering pipeline and one end of the fourth filtering pipeline are communicated with the first filter and the second filter respectively, the other end of the first filtering pipeline, the other end of the second filtering pipeline, the other end of the third filtering pipeline and the other end of the fifth filtering pipeline are all communicated with the fifth filtering pipeline, the first middle water pump and the second middle water pump are arranged on the first filtering pipeline and the second filtering pipeline respectively, and the first filter and the second filter are both communicated with a clear water recycling device.

Description

technical field [0001] The invention relates to a coal-containing wastewater treatment system and a coal-containing wastewater treatment process, belonging to the field of supporting facilities of thermal power plants. Background technique [0002] Conventional coal-containing wastewater treatment process is as follows: [0003] Coal-containing wastewater→coal-water collection pool (around the coal yard)→coal-water delivery pump→coal-containing wastewater sedimentation tank→intermediate water pump (supernatant)→filter (dosing)→clean water pool→clear water pump→treated qualified waste water back used in coal yards (such as figure 1 shown). [0004] Coal-containing wastewater is collected by the first-level coal-water collection tank and then boosted and transported to the coal-water sedimentation tank. The coal-water sedimentation tank has a large volume and a long residence time, so the coal slime is deposited in the sedimentation tank, and the supernatant is boosted and t...

AI Technical Summary

Problems solved by technology

[0006] 1) Coal slime is easy to deposit in the coal water collection tank and needs to be cleaned manually on a regular basis. If the cleaning is not timely, the entire coal-containing wastewater treatment system will be shut down;

[0007] 2) The coal-water sedimentation tank is generally a rectangular, underground pool. There are dead spots in the slime deposition. Because the grab track is fixed, it needs to be cleaned manually on a regular basis;

[0008] 3) The volume of the coal-water sedimentation tank is large, and the coal-water inflow has not been distributed, resulting in uneven deposition of coal slime. Coal slime with large particle size is easier to deposit near the pool wall at the water inlet, and the grab bucket cannot be cleaned;

[0009] 4) The water quality of the supernatant is unstable. When the inflow flow is small, the water quality of the supernatant is slightly better

When the influent flow rate is large, the water quality of the supernatant is poor, resulting in a high failure rate of the subsequent filter operation;

[0010] 5) The flow rate of the supernatant is unstable. If the subsequent dosing is required, the dosage adjustment will be very frequent, resulting in a high failure rate of the dosing system;

[0011] 6) Because the coal slime and coal water are not separated when the grab bucket is cleaning the coal slime, the moisture content of the cleaned coal slime is very high, and it needs to be piled up for a period of time before reuse;

[0012] 7) Untimely manual cleaning will cause the entire coal-water sedimentation tank to lose its sedimentation function, resulting in frequent outages of the coal-containing wastewater treatment system

[0013] In view of this, in the patent document with the application number 201310597414.2, the coal-water collection system on the ground of the hardened coal unloading square of the coal-fired power plant is disclosed. The above-mentioned comparative documents have disadvantages such as high investment and high labor costs.

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