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Air-water combined siphonage bidirectional backwash technique and device

A gas-water combination and backwashing technology, applied in the field of backwashing, can solve problems such as large distances, and achieve the effects of good elution effect, extended period and extended backwashing period.

Inactive Publication Date: 2008-05-07
CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this device also has many shortcomings. Due to the characteristics of the BAF reaction system, most of the impurities are adsorbed on the lower part of the reaction column. It takes a long distance to discharge from the upper port, and the impurities have to overcome the influence of gravity in the process of moving upwards. As far as a single carrier is concerned, since the sewage is treated with the lower part of the water, the upper port overflows the water. Upflow processing method, so the impurities are mainly adsorbed on the lower surface of the carrier, and the elution direction is opposite to the water flow direction, which is also an important factor affecting the backwashing effect

Method used

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  • Air-water combined siphonage bidirectional backwash technique and device
  • Air-water combined siphonage bidirectional backwash technique and device

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Experimental program
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Embodiment

[0020] (1) The diluted biomass sewage is stored in the sewage pool 7, the initial water COD is 3296mg / L, and enters the sewage treatment system 8 through the water inlet valve 1 through the water inlet pump 6.

[0021] (2) Adopt the liquid flow mode of water inflow from the lower part and overflow water from the upper port to treat sewage. When the treatment effect drops to 75%, use air-water combined siphon bidirectional backwash to backwash the reaction system, close the upper overflow outlet 3 during sewage treatment, open the lower siphon outlet valve 2, and stop the flow from the water inlet valve 1 into the water.

[0022] (3) First adjust the air backwash intensity to 155L / h, fully aerate for 3 minutes, then enter the backwash water from the lower water inlet valve 1, the water backwash intensity is 5L / h, and combine with bottom aeration; at this time, the water flow Upward surge, combined with bottom aeration, realizes upward backwashing of the carrier, which can have...

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Abstract

The invention discloses a gas-water united siphon bi-directional backwash art and the device thereof, belonging to the backwash field of the sewage treating art. The invention relates to establish a new backwash art in a fluidized bed system for treating sewage, and names the art as a gas-water united siphon bi-directional backwash art. The invention has the characteristics that the bottom aeration is adopted; when the lower part has inflow and reaches the siphon water level, the siphon at the lower part automatically discharges backwash water. The new backwash art has the advantages of time and water conservation, short recover period after the backwash, prolonged backwash period and so on when being compared with the commonly adopted gas-water united unilateral backwash art and the single pure water backwash art at present.

Description

technical field [0001] The invention belongs to the field of backwashing of sewage treatment technology, and in particular relates to an air-water combined siphon bidirectional backwashing process and device in which backwashing water surges. Background technique [0002] Biological filter (BAF) is a high-efficiency, low-cost and land-occupied sewage treatment technology that integrates filtration, adsorption and biological oxidation. However, due to the mechanical interception, contact coagulation and biological coagulation of the filter material, the suspended inorganic colloid particles will be continuously trapped in the pores of the filler as the operating time prolongs. In addition, due to the increase of biofilm thickness and the increase of aging and dead microorganisms, the filler voids are reduced and the pump head loss is increased. The treatment effect on sewage is gradually declining. [0003] It is generally believed that the thickness of the biofilm should b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/02B01D41/00
CPCY02W10/10
Inventor 杨金水刘伟杰袁红莉
Owner CHINA AGRI UNIV
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