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Treatment system for coal chemical industry wastewater

A treatment system and denitrification technology, applied in the field of coal chemical wastewater treatment system, can solve the problem of affecting the effect of pre-denitrification treatment and high dissolved oxygen content in effluent, and achieve the goal of improving efficiency, reducing carbon sources and reducing dissolved oxygen concentration. Effect

Pending Publication Date: 2020-10-16
SUEZ WATER TREATMENT CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the actual operation process, due to the lack of excess carbon sources and the need for aeration and stirring to prevent the sedimentation of biochemical sludge, the actual dissolved oxygen content in the effluent is high, and after the sludge is returned to the pre-denitrification zone A1, it has the same impact as the return of the nitrification solution. Pre-denitrification treatment effect

Method used

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  • Treatment system for coal chemical industry wastewater
  • Treatment system for coal chemical industry wastewater
  • Treatment system for coal chemical industry wastewater

Examples

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no. 1 example

[0057] Such as figure 2 As shown, the treatment system for coal chemical wastewater according to the first embodiment of the present invention includes a front denitrification zone A1, a nitrification decarbonization zone O1, a first facultative oxygenation zone C1, a post denitrification zone A2, and a second denitrification zone. Facilitating zone C2, and secondary settling tank F. Among them, part of the mixed liquid in the first facultative zone C1 and part of the sludge in the secondary settling tank F are returned to the inlet of the pre-denitrification zone A1. To this end, the processing system also includes: a mixed liquid reflux pump P1 and corresponding pipelines, so that the reflux mixed liquid Q2 from the first facultative oxygenation zone C1 flows back to the inlet of the pre-denitrification zone A1, and the mixed liquid reflux pump P1 can It is a variable-frequency adjustable flow volumetric submersible pump; sludge return pump P2 and corresponding pipelines, so...

no. 2 example

[0087] The treatment system for coal chemical wastewater according to the second embodiment of the present invention includes a front denitrification zone A1, a nitrification decarbonization zone O1, a post denitrification zone A2, and a secondary settling tank F. The front denitrification zone A1, the nitrification decarbonization zone O1, the post denitrification zone A2, and the secondary settling tank F according to the second embodiment are similar to those of the first embodiment, and the description thereof is omitted here. It should be noted that the thickness of the sludge bed in the secondary settling tank F according to the second embodiment can be kept within a suitable range, such as 1-2.5m, 1-2m, 1.5-2m, 1.5-2.5m, preferably 1.5-2.5m, promote the bottom sludge to be in a hydrolyzed state, the activated sludge itself hydrolyzes to produce absorbable organic matter as a carbon source, and denitrifies with the nitrate in the water to further remove the total nitrogen ...

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Abstract

The present invention discloses a treatment system for coal chemical industry wastewater, which comprises: a pre-denitrification zone, wherein raw water enters the pre-denitrification zone to carry out a denitrification reaction; a nitrification and decarburization zone, wherein mixed liquid from the pre-denitrification zone enters the nitrification and decarburization zone to be subjected to a nitrification reaction; a first facultative zone, wherein the mixed liquid from the nitrification and decarburization zone enters the first facultative zone to be subjected to synchronous nitrificationand denitrification, and one part of the mixed liquid in the first facultative zone flows back to the inlet of the front denitrification zone through a reflux pump; residual mixed liquid from the first facultative zone enters the rear denitrification zone to be subjected to denitrification reaction; the mixed liquid from the rear denitrification zone enters the second facultative zone to be subjected to synchronous nitrification and denitrification; mixed liquid from the second facultative zone enters the secondary sedimentation tank to be subjected to mud-water separation, and a part of sludge at the bottom flows back to an inlet of the front denitrification zone through a sludge reflux pump. According to the treatment system disclosed by the invention, the efficiency of pre-denitrification and post-denitrification can be improved, and the consumed carbon source is reduced.

Description

Technical field [0001] The invention relates to the technical field of water treatment, in particular to a treatment system for coal chemical wastewater. Background technique [0002] Coal chemical industry will produce a large amount of waste water in the production process, which is mainly produced in the washing (coal gasification unit), condensation (coal gasification unit) and purification process (purification unit) of coal gas, of which the washing and condensate water of the coal gasification unit are the main ones. Wastewater has high water temperature, high suspended solids, high hardness, high ammonia nitrogen and a certain amount of organic matter, which cannot meet the needs of direct discharge and biochemical treatment. Generally, gray water treatment is first performed in the coal gasification unit area. Grey water treatment usually adopts the process of multi-stage flash evaporation and precipitation. After treatment, most of the grey water is directly reused as w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/30C02F101/30C02F101/38
CPCC02F3/302C02F2001/007C02F2101/30C02F2101/38
Inventor 寇光辉郑斌周夏海张志峰朱先富
Owner SUEZ WATER TREATMENT CO LTD
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