Process technology aiming at strengthening treatment of waste water in chemical engineering centralizing area

A process technology and technology for concentrated areas, which are applied in the field of enhanced pretreatment of sewage in chemical concentration areas, can solve the problems of large changes in water quality and water quantity, inability to adapt to the impact of influent water quality, and low biodegradable B/C values. Achieve the effect of reducing wastewater toxicity, facilitating centralized management and improving B/C value

Inactive Publication Date: 2012-07-18
CHANGSHU RES INSTITUE OF NANJING UNIV OF SCI & TECH +1
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Problems solved by technology

However, in sewage treatment plants in chemical concentration areas, there will be problems such as high influent COD concentration, low biodegradable B / C value, and large changes in water quality and water volume, making conventional biochemical treatment systems unable to adapt to the impact of influent water quality

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  • Process technology aiming at strengthening treatment of waste water in chemical engineering centralizing area

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Embodiment Construction

[0013] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0014] The sewage treatment process of the present invention is as figure 1 As shown, an enhanced pretreatment process is added between the first-level physical treatment (coarse grid inlet pump house-fine grid grit chamber) and the second-level biochemical treatment (AAO biochemical tank-secondary sedimentation tank), that is, the adjustment Hydrolytic acidification tank - hydrolysis sedimentation tank - sludge return tank.

[0015] The regulating hydrolysis acidification pool adopts the oxidation ditch pool type, and 2 to 5 low-speed submersible flowmakers are arranged in sections in the pool to generate circulating water flow in the pool and prevent sludge deposition in the pool. The circulating water flow is mixed, so as to play a homogeneous role. At the same time, the anaerobic activated sludge in the pool is used to degrade th...

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Abstract

The invention relates to process technology aiming at strengthening treatment of waste water in a chemical engineering centralizing area, which comprises an adjustment hydrolysis acidification tank, a hydrolysis sedimentation tank and a sludge backflow tank. The adjustment hydrolysis acidification tank adopts the oxidation ditch tank type adjustment hydrolysis acidification tank. The hydrolysis sedimentation tank adopts the mode that water enters from the center and leaves from the periphery in radial flowing mode. A sludge backflow pump and a surplus sludge pump are arranged in the sludge backflow tank. The process technology resolves the problem that inlet waste water is hard to degrade, the COD density is high, B / C value is low, water quality and water yield are large in changing amplitude in the chemical engineering centralizing area, achieves the effect that biological refractory substances are converted into readily biodegradable substances, improves CODcr removing rate in waste water and increases biochemistry B / C value.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment in the discipline of environmental engineering, and specifically relates to a process technology for intensified pretreatment of sewage in chemical industry concentration areas. Background technique [0002] In order to coordinate the development of economic benefits, social benefits and environmental benefits, the national policy encourages the centralized treatment of domestic sewage and industrial enterprise production wastewater, implements centralized construction of sewage treatment facilities, centralized pollution control, and gradually realizes the transformation of pollution control from decentralized treatment to centralized control. change. However, in sewage treatment plants in chemical concentration areas, there will be problems such as high influent refractory COD concentration, low biodegradable B / C value, and large changes in water quality and water volume, making convent...

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Application Information

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IPC IPC(8): C02F9/14
Inventor 朱长林冯锋梁祎方赓刘明星郑思雪
Owner CHANGSHU RES INSTITUE OF NANJING UNIV OF SCI & TECH
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