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Improved biological aerated filter

An aerated biological filter, an improved technology, applied in the field of separation equipment

Inactive Publication Date: 2013-04-17
SHAANXI XUANHETONG TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few studies on the operation mode of downflow BAF mid-stage aeration

Method used

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  • Improved biological aerated filter

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Embodiment 1

[0011] The improved biological aerated filter is made of plexiglass, and its size is φl50mm x 1500mm. The filler layer 4 is biological ceramsite of φ3-5 mm, the filler height is 1200 mm, the bottom is a support layer 8 with a height of 50 mm, and sampling ports 5 are set every 200 mm above the water outlet 7, a total of 6. An aeration pipe is arranged in the biological filter, and the aeration port 6 is 7500 mm away from the water outlet. The upper part of the aeration port 6 is an aeration area, and the lower part is a non-aeration area. When BAF is in operation, air and sewage enter in two branches, and air and water combined backwashing is adopted, and the time and intensity of backwashing are determined according to the operating water head loss and treatment effect. Considering the disadvantages of downflow aerated biological filter, such as easy blockage and frequent backwashing, a backwashing system is added in the middle of the biological filter, and the method of part...

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Abstract

The invention relates to a separation device made of loose filter materials for liquid or gaseous fluids. An improved biological aerated filter (BAF) disclosed by the invention comprises a hollow main body with an opening at the top, wherein a packing layer is arranged at the upper part of the main body; a supporting layer is arranged at the lower part of the packing layer; a water outlet is formed in the lower part of the main body; a plurality of sampling ports are formed above the water outlet; in addition, the main body is further provided with an aeration port. The water effluent of the improved BAF can achieve the first-grade standard of Discharge Standards for Municipal Wastewater Treatment Plant, and the improved BAF has better denitrification capacity. With the increase of gas-water ratio, the removal rates of COD (Chemical Oxygen Demand) and TN (Total Nitrogen) are firstly increased and then decreased, and the removal rate of NH4<+>-N is increased gradually.

Description

technical field [0001] The invention relates to a separation device composed of loose filter materials for liquid or gaseous fluids. Background technique [0002] Biological aerated filter (BAF) absorbs and decomposes sewage by using biological oxidation and filtration retention, and its good decarbonization and nitrogen removal performance has always attracted the attention of researchers at home and abroad. At the same time, the advantages of low infrastructure investment, high treatment efficiency, and convenient management make it especially suitable for the construction and renovation of sewage treatment plants in small and medium-sized cities that are short of funds. [0003] The enhanced denitrification function of the biological aerated filter has always been a research hotspot in this field. The removal of nitrogen is closely related to the concentration and activity of nitrifying bacteria in the reactor, and DO in the filter directly affects the concentration of ...

Claims

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Application Information

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IPC IPC(8): C02F3/02
CPCY02W10/10
Inventor 周莉英
Owner SHAANXI XUANHETONG TECH DEV
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