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Nitrogen and phosphorus removal method and device for urban sewage

A technology for nitrogen and phosphorus removal and urban sewage, applied in water/sewage treatment, chemical instruments and methods, biological water/sewage treatment, etc. Secondary pollution and other problems can be achieved to reduce operating costs and investment costs, improve anoxic environment, and improve quality

Inactive Publication Date: 2020-07-17
ZHEJIANG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The chemical sludge produced by the chemical method has a large water content, is difficult to dehydrate, is difficult to handle, and is prone to secondary pollution. The biological phosphorus removal process has poor operational stability, strict operation, and is greatly affected by the temperature and pH of the wastewater.

Method used

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  • Nitrogen and phosphorus removal method and device for urban sewage

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Embodiment

[0033] A composite filler denitrification and dephosphorization filter coupled with iron-carbon and loofah. Set up two groups of upward continuous flow denitrification filter reactors with the same operating conditions. The first group is added with an appropriate amount of iron-carbon as a supporting layer, and then Add an appropriate amount of loofah after inoculating sludge as a filter layer, add an appropriate amount of iron-carbon as a supporting layer in the second group, and then add an appropriate amount of volcanic rock after inoculating sludge as a filter layer, and use laboratory water distribution for water inflow. Influent NO 3 - -N concentration is 15-20mg / L, influent TP concentration is 1.4-1.7mg / L, no carbon source is added, the reactor operates under anoxic conditions, the residence time is 1h, and the reactor is reacted every 15 days After flushing once, the rust and excess sludge produced by the reactor will be deposited at the bottom of the reactor, which ...

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Abstract

The invention discloses a nitrogen and phosphorus removal method and device for urban sewage, belonging to the technical field of wastewater treatment. The method comprises the following steps: filling the lower layer of a filter tank with a proper amount of an iron-carbon filler, arranging a loofah sponge filter material filled with activated sludge as the upper layer of the filter tank, and carrying out upward continuous flow operation. According to the invention, an iron-carbon phosphorus removal and oxygen consumption process is coupled with a loofah sponge solid slow-release carbon sourcedenitrification process, no carbon source is added to remove nitrogen, phosphorus and other pollutants in the wastewater, and physical, chemical and biological synergistic advanced treatment of the wastewater is realized.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a method and device for denitrification and dephosphorization of urban sewage. Background technique [0002] With the development of social economy and the improvement of environmental protection awareness, the tail water discharge standards of my country's urban sewage treatment plants are becoming increasingly stringent. Beijing, Tianjin and other cities have proposed higher discharge standards for the discharge of urban sewage treatment plants than the first-level A discharge standard. Taizhou, Jinhua, Quzhou and other places in Zhejiang Province have also issued policies to implement the effluent of urban sewage treatment plants to meet Class IV standards. Among them, controlling the effluent TN and TP to reach the standard is the key to achieve the quasi-IV standard. However, the effluent TN of the existing sewage treatment plant is mainly nitrate nitroge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/00C02F3/28C02F1/461
CPCC02F1/46176C02F3/005C02F3/2806C02F2201/46105C02F2209/22C02F2305/06
Inventor 李军吕极腾吴淑云郭焘
Owner ZHEJIANG UNIV OF TECH
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