Method for low-temperature denitrification phosphorous removal

A technology of nitrogen and phosphorus removal and low temperature, which is applied in the direction of aerobic and anaerobic process treatment, can solve the problem of difficult to achieve simultaneous nitrogen and phosphorus removal, and achieve the effect of sufficient carbon source and beneficial to nitrogen removal

Inactive Publication Date: 2008-01-30
HARBIN INST OF TECH
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  • Description
  • Claims
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Problems solved by technology

[0009] The purpose of the present invention is to provide a low-temperature denitrification and phosphorus removal method in order to solve the problem th

Method used

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  • Method for low-temperature denitrification phosphorous removal
  • Method for low-temperature denitrification phosphorous removal

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specific Embodiment approach 1

[0020]Specific embodiment one: as shown in Figure 1, the processing system adopted in the method for the low-temperature denitrification and dephosphorization of this embodiment consists of anoxic pond 1, anaerobic pond 2, aerobic pond 3, first sedimentation pond 4, contact The oxidation tank 5 and the second sedimentation tank 6 are composed of six structures. The treatment method is: 1. Cultivation and fixation of low temperature resistant denitrifying bacteria and nitrifying bacteria: the anoxic tank 1 uses fillers to fix the denitrifying bacteria on the polyurethane foam filler through the natural hanging film, and the contact oxidation tank 5 uses the immobilization method to fix the denitrifying bacteria on the polyurethane foam filler. The nitrifying bacteria are fixed on the polyurethane foam filler, the specific process is as follows: under the condition of 4 ~ 10 ℃, put the activated sludge into the polyurethane foam container, aerate, aerobic culture; after one week ...

specific Embodiment approach 2

[0031] Specific embodiment two: in the present embodiment, the process that the nitrifying bacteria isolated in step 2 is fixed on the polyurethane carrier by enrichment culture is as follows: (1) under the condition of 4 DEG C, the nitrifying bacteria are enriched and cultivated, when the MPN counts, the concentration reach 10 5 cells / ml, the enrichment culture is considered successful; take out the cultivated strain culture solution and centrifuge at n=4000 rpm for 15 min, discard the supernatant, wash the precipitate twice with phosphate buffer solution, and wash three times with normal saline Centrifuge again, discard the supernatant; add distilled water to the wet bacteria to prepare a suspension of psychrotrophic bacteria, and the OD of the psychrotrophic suspension is 585 About 1.854; (two) use Na 2 CO 3 Regulating saturated boric acid pH value is 6.7, and polyvinyl alcohol is dissolved in 100 ℃ of water baths and is cooled to 30 ℃; (3) the nitrifying bacteria suspens...

specific Embodiment approach 3

[0032] Embodiment 3: In this embodiment, the side length of the polyurethane foam is 1.5-3.0 mm, the bulk density is 0.06 kg / L, and the bulk volume is 500 ml. Others are the same as in the second embodiment.

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Abstract

A method of denitrification and phosphorus removal under low temperature relates to a way of sewage treatment. The invention solves the problem of the poor effect of existing biological simultaneous denitrification and phosphorus removal under low temperature. The invention comprises the steps of: 1. cultivation and fixation for nitrifying and denitrifying bacteria of low temperature tolerance; 2 start-up response system and cultivation of phosphate accumulating bacteria ; 3. denitrification and phosphorus removal under low temperature by the steps: a. denitrification by nitrate solution refluxing; b. anaerobic action; c. aerobic phosphorus removal; d. precipitation and sludge reflux; e. contacting oxidation and nitration; f. precipitation and water obtained. After the steps, denitrification and phosphorus removal of sewage treatment under low temperature are finished. The invention can realize simultaneous denitrification and phosphorus removal under low temperature. The invention comprises the contents under low temperature: the removal rate of COD is above 85 percent; the removal rate of overall phosphorus reaches above 80 percent; the removal rate of ammonia nitrogen reaches above 70 percent when the intake ammonia nitrogen is between 25-60mg/L.

Description

technical field [0001] The invention relates to a sewage treatment method. Background technique [0002] Temperature is an important ecological factor for the growth of microorganisms. Within a certain temperature range, the activity of microorganisms is directly proportional to the temperature. The activity of most microorganisms weakens with the decrease of temperature. When the temperature is lower than 15°C, the activity of microorganisms will decrease sharply. In the range of 10°C, some microorganisms begin to appear dormant; Microbes go into a dormant state. As a result, the biological treatment of wastewater is affected, and the impact of temperature reduction on nitrogen and phosphorus removal bacteria is more obvious. The traditional theory holds that biological nitrification and denitrification can be carried out in the temperature range of 4-45 °C. The optimum growth temperature of nitrosifying bacteria is 35°C, the optimum growth temperature of nitrifying bact...

Claims

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Application Information

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IPC IPC(8): C02F3/30
Inventor 徐桂芹张雷石玉明韩晓云闫波姜安玺
Owner HARBIN INST OF TECH
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