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Denitrification and algae removal-enhanced raw water biomembrane pretreatment technology device and method

A process device and biofilm technology, which is applied in the field of raw water biofilm pretreatment process devices, can solve problems that rarely involve the simultaneous removal of nitrogen and algae, and achieve the effect of reducing treatment risks and increasing stability

Active Publication Date: 2014-11-19
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current raw water biofilm pretreatment process mostly focuses on ammonia nitrogen and COD Mn The removal efficiency urgently needs to be further enhanced; moreover, the fully aerated mode is mostly used in the biofilm process of raw water pretreatment. The membrane pretreatment process rarely involves simultaneous removal of nitrogen and algae

Method used

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  • Denitrification and algae removal-enhanced raw water biomembrane pretreatment technology device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The reactor body is in the shape of a cuboid, and the effective volume of the reactor is 64 L. The ratio of the length, width and height of the device is 5:0.5:1 respectively; the inlet water distribution plate 3 and the outlet water distribution plate 8 are perforated sieve plates with uniform holes Distributed on the sieve plate, the pore size is 1 cm, and the ratio of the total pore area S1 to the total area S2 of the sieve plate is 0.2:1; the aeration tube 5 is arranged at the front end of the reactor, and the distance from the bottom of the reactor is 5 cm. The horizontal area S3 of the gas zone accounts for 10% of the total area S4 at the bottom of the reactor; the aperture size of the mesh screen 6 is 0.5 cm, and the distribution position is 0.3 times the length of the reactor, and there are two locations.

[0026] The filler filled in the device is the elastic filler of the pre-hanging film, and the biomass attached to the carrier is 0.95 mg TOC g -1 Carrier: D...

Embodiment 2

[0028] A brand-new elastic packing was used, the gas-liquid ratio was 1:1, the DO concentration in the reactor was 1.8 mg / L, and the rest of the conditions were the same as in Example 1. Due to the use of new fillers, on the 31st day of operation, the chlorophyll content of the influent and effluent water of the reaction device did not change significantly. After the biofilm was formed, the chlorophyll was significantly removed, and when the operation reached 101 days, no chlorophyll content was detected in the effluent of the reactor (incoming The water chlorophyll level is the same as in Example 2). During the start-up phase of the reactor, the operating performance fluctuated greatly compared with Example 2, but after a period of operation, the concentration of ammonia nitrogen in the effluent was still as low as 0.37±0.19 mg / L, meeting the 0.5 mg / L requirement specified in GB5749-2006.

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Abstract

The invention provides a denitrification and algae removal-enhanced raw water biomembrane pretreatment technology device and method. According to the technology device, a water inlet pipe, a water inlet unit, an inlet water distribution plate, an aeration device, an aeration pipe, dividing screens, a carrier filling area, an outlet water distribution plate, a water outlet unit, an overflow weir and a water outlet pipe are arranged on the side surface of the bottom of a reactor body; and on this basis, the invention provides a denitrification and algae removal-enhanced raw water biomembrane pretreatment technology starting and running method. The advantages are that a biomembrane can effectively remove pollutants such as nitrogen in raw water, and algae can be synchronously removed though the effects such as adsorption and mechanical interception; through the inlet water distribution plate, the volume of a dead zone of a reactor can be greatly reduced, and algae can be effectively intercepted by matching the dividing screens, the outlet water distribution plate and the filling carrier; a precoating filler is beneficial to shortening of biomembrane pretreatment technology starting period, and shortening the time for realizing the synchronous denitrification and algae removal of the reactor; and through the optimization of aeration conditions and positions, not only can the ammoxidization performance be enhanced, but also the energy consumption for aeration can be reduced.

Description

technical field [0001] The invention relates to a raw water biofilm pretreatment process device and method for strengthening denitrification and algae removal, and belongs to the technical field of drinking water pretreatment. Background technique [0002] The entry of nutrients such as nitrogen into the water will lead to eutrophication of the water body, causing a large number of algal blooms, seriously deteriorating the water quality of the environmental water body and water source, not only increasing the cost of drinking water treatment, but also causing serious drinking water safety problems. In the commonly used disinfection process, ammonium salts or organic substances can react with chlorine to produce disinfection by-products (DBP), which can damage the human nervous system; and the destruction of algae will release a large amount of organic substances and algal toxins. Organic pollutants are generally considered to be the precursors of DBP, and they are easy to fo...

Claims

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Application Information

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IPC IPC(8): C02F3/02C02F3/10
CPCY02W10/10
Inventor 徐向阳阳广凤冯丽娟朱亮杨玘王莎飞
Owner ZHEJIANG UNIV
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