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Reinforced biofilm formation method of raw water biological pretreatment technique

A technology of biological pretreatment and film-hanging method, applied in the direction of sustainable biological treatment, aerobic process treatment, etc., can solve the problems of limiting the rapid start and stable operation of raw water biological pretreatment process, limited microbial growth, sensitive environmental conditions, etc. , to achieve the effect of accelerating enrichment and biofilm formation, accelerating biofilm formation, and improving operating performance

Active Publication Date: 2014-12-03
ZHEJIANG UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polluted raw water belongs to oligotrophic water quality, the growth of microorganisms is limited during the treatment process, biofilm enrichment is difficult, and it is sensitive to environmental conditions, which greatly limits the rapid start-up and stable operation of the raw water biological pretreatment process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A columnar biofilm reactor with an effective volume of 15.0 L was used. Slightly polluted river sediment was inoculated, and the inoculated sediment accounted for 10% of the effective volume of the reactor. The ratio of the dry weight of the sediment to the effective volume of the reactor was 68.5 g / L, and the corresponding volatile organic compound content of the sediment was 1.73 g / L. The solid volume filling rate of the elastic filler carrier is 1.14%, and the specific surface area is 18 m 2 / m 3 , the temperature is controlled at 25°C, the aeration intensity is high, and the dissolved oxygen concentration inside the reactor is saturated (≧9 mg / L).

[0017] With slightly polluted river water as the influent base, add (NH 4 ) 2 SO 4 (28 mg N / L) and ethanol (42 mg C / L), in order to ensure that the system has a certain buffer capacity and provide the phosphorus and inorganic carbon sources required by microorganisms, add KH 2 PO 4 and NaHCO 3 , and their concent...

Embodiment 2

[0020] A columnar biofilm reactor with an effective volume of 15.0 L was used. The influent composition and carrier filler were the same as those in Example 1, with hydraulic agitation for reoxygenation and providing the shear force required for biofilm formation, the water flow rate was 202 L / h, and the dissolved oxygen concentration inside the reactor was 6-8 mg / h. L. After 18 days of operation, the oxidation rate of ammonia nitrogen changed from 0.74 mg L -1 d -1 increased to 4.69 mg L -1 d -1 , is 8.5 times the ammonia nitrogen oxidation activity of the control reactor in the same period (without nutrient enhancement and sediment addition, and the other conditions are the same), and the biomass content in the biofilm, characterized by DOC, increased to 0.36mg / g carrier, which is the best in the control reactor 4 times. In the subsequent actual raw water treatment process, the ammonia nitrogen removal rate of the experimental reactor was 4.8 times that of the control...

Embodiment 3

[0022] A columnar biofilm reactor with an effective volume of 15.0 L was used. The carrier filler and the aeration mode are the same as those in Example 1. The influent base adopts the mature raw water biofilm pretreatment process to effluent, and the rest of the components are the same as in Example 1. After 18 days of operation, the oxidation rate of ammonia nitrogen changed from 1.21 mg L -1 d -1 increased to 5.97 mg L -1 d -1 , which is 10.9 times that of the ammonia nitrogen oxidation activity of the control reactor (without nutrient enrichment and sediment addition, and other conditions are the same) in the same period. The Shannon biodiversity index in the biofilm was 2.87, which was significantly higher than that in the control reactor, and the biomass represented by DOC in the biofilm rose to 0.52 mg / g carrier, which was 5.8 times that in the control reactor. In the subsequent actual raw water treatment process, the ammonia nitrogen removal rate of the experime...

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Abstract

The invention provides a reinforced biofilm formation method of a raw water biological pretreatment technique. By inoculating surface water source area or polluted surface water (river water, and lake and reservoir water) sediment, raw water or raw water biological pretreatment technique effluent water is used as an acclimatization matrix, a mechanical aeration or hydraulic disturbance mode is adopted for oxygen supply, and a biofilm is provided to form required proper shearing conditions. The sediment and acclimatization matrix are taken from the oligotrophic environment of target treatment water quality, thereby being beneficial to enrichment culture and colonization of functional microbes. The nutrient orientated reinforcement means is adopted to overcome the defects of insufficient nutrients of the oligotrophic environment and slow microbial growth, and accelerates the enrichment of the functional microbes and the formation of the biofilm. The proper aeration or hydraulic disturbance is utilized for reoxygenation and providing shearing force for biofilm formation, thereby further accelerating the formation of the biofilm, greatly shortening the start time of the raw water biofilm pretreatment technique, and enhancing the operating performance of the technique.

Description

technical field [0001] The invention relates to a film-hanging start-up method for a raw water biofilm pretreatment process, and belongs to the technical field of raw water biological pretreatment. Background technique [0002] The acceleration of urbanization has led to a large amount of industrial wastewater, urban sewage, and agricultural runoff being discharged into rivers, lakes, and seas, resulting in deteriorating environmental water quality. Especially in the developed eastern coastal areas of my country, the deterioration of water quality is particularly serious. The resulting drinking water safety The problem has received widespread attention. According to the survey, the pollution of drinking water sources in my country is dominated by nitrogen and organic matter (refractory organic matter, dissolved organic matter and micro-pollutants, etc.). Traditional raw water treatment processes include coagulation, sedimentation, filtration and disinfection, which can remov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/02C02F3/08
CPCY02W10/10
Inventor 朱亮阳广凤冯丽娟杨玘王莎飞徐剑徐向阳
Owner ZHEJIANG UNIV
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