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Composite biological filter for treating high algae-laden and high ammonia-nitrogen raw water and application method thereof

A composite biological filter and high ammonia nitrogen raw water technology, applied in the field of eutrophic environmental water restoration, can solve the problems of long process flow, high energy consumption and large occupied area of ​​biological aerated filter, and achieve biological stability of water quality performance, low energy consumption, and low aeration

Active Publication Date: 2015-10-07
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional biological aerated filter process is long, and the biochemical tank and the filter are separated, resulting in a series of problems such as large floor area and high energy consumption.

Method used

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  • Composite biological filter for treating high algae-laden and high ammonia-nitrogen raw water and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] use figure 1 In the composite biological filter shown, the selected filter material is a combination of suspended ball biological filter material, zeolite and activated carbon filter material, and the influent water is river water polluted by high algae and high ammonia nitrogen, and the concentrations of algae, TOC, ammonia nitrogen and other pollutants are respectively 10 8 -10 9 cell / mL, 5mg / L, 7mg / L, C / N ratio is 1:1.4. Mechanical aeration is used to maintain the DO concentration in the device at 5 mg / L, and the gas-liquid ratio is 4:1.

[0019] After 60 days of operation, the start-up and stable operation of the composite biological filter were successfully achieved. The removal rates of ammonia nitrogen, turbidity, and TOC reached 93%, 82%, and 67% respectively, and the concentrations of ammonia nitrogen and turbidity in the effluent were respectively lower than 0.5mg / L. , 1NTU, meeting the requirements of GB5749-2006 water quality standard.

Embodiment 2

[0021] use figure 1 In the composite biological filter shown, the selected filter material is a combination of suspended ball biological filter material, zeolite and activated carbon filter material, and the influent water is river water polluted by high algae and high ammonia nitrogen, and the concentrations of algae, TOC, ammonia nitrogen and other pollutants are respectively 10 6 -10 7 cell / mL, 5mg / L, 7mg / L, C / N ratio is 1:1.4. Mechanical aeration is used to maintain the DO concentration in the device at 5 mg / L, and the gas-liquid ratio is 4:1.

[0022] After 60 days of operation, the start-up and stable operation of the composite biofilter were successfully realized. The removal rates of ammonia nitrogen, turbidity and TOC reached 98%, 61% and 55% respectively, and the concentrations of ammonia nitrogen and turbidity in the effluent were respectively lower than 0.5mg / L , 1NTU, meeting the requirements of GB5749-2006 water quality standard.

Embodiment 3

[0023] Embodiment 3 (comparative example)

[0024] use figure 1 For the biological aerated filter shown, the effective volume of the reactor is 3L. The selected filter material zeolite and activated carbon combined filter material, the influent water is river water polluted by high algae and high ammonia nitrogen, and the concentrations of algae, TOC, ammonia nitrogen and other pollutants are respectively 10 6 -10 7 cell / mL, 5mg / L, 7mg / L, C / N ratio is 1:1.4. Mechanical aeration is used to maintain the DO concentration in the device at 5 mg / L, and the gas-liquid ratio is 4:1.

[0025] After 60 days of operation, the start-up and stable operation of the composite biological filter were successfully achieved, and the removal rates of ammonia nitrogen, turbidity, and TOC reached 91%, 48%, and 44%, respectively. The effect of the composite biofilter without adding the suspension ball biofilter (Example 3) is worse than that of the composite biofilter with the suspension ball ...

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Abstract

The invention discloses a composite biological filter for treating high algae-laden and high ammonia-nitrogen raw water and an application method thereof. An overflow pipe, a water inlet unit, a sampling opening, a carrier filling area, a water outlet unit and an aerating device are arranged on a composite biological filter body unit from top to bottom in sequence, and suspended spherical biological filter materials, zeolite filter materials, granular active carbon filter materials and a supporting layer are arranged in the carrier filling area from top to bottom in a graded mode. The composite biological filter has the advantages that the spherical biological filter materials can effectively enrich a biological film to remove nitrogen elements and other pollutants in polluted raw materials, algae can be synchronously removed through adsorption, mechanical entrapment and other functions of zeolite and activated carbon, the head loss of an aerating filter can be effectively reduced through a special composite filter material structure, and the back flush frequency is lowered. Meanwhile, the aerating mode, hydraulic retention time and other technological parameters are optimized, and fast biofilm culturing decontamination of the spherical biological filter materials and efficient and low-consumption stable running of a system are achieved.

Description

technical field [0001] The invention relates to a three-stage biological filter device and a method thereof, which are suitable for the treatment of high-algae and high-ammonia-nitrogen raw water, and use suspended ball biological carriers, zeolite and activated carbon as filter materials, and are suitable for restoration of eutrophic environment water bodies. Background technique [0002] With the rapid development of urbanization and the continuous improvement of the level of agricultural intensification in my country, the problem of water environmental pollution has become increasingly prominent. The resulting problems such as eutrophication of lakes and reservoirs and frequent occurrence of algae have always been the focus of researchers. Over the past year, people's living standards have been improving day by day, and the requirements for the quality of drinking water have also become higher and higher. The existing water production technology can no longer meet the corr...

Claims

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Application Information

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IPC IPC(8): C02F3/08C02F3/10
CPCY02W10/10
Inventor 朱亮王莎飞徐向阳阳广凤夏天郭彩荣张智明
Owner ZHEJIANG UNIV
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