Method for synchronously denitrification, dephosphorization and filtering

Abstract

The present invention provides a filtering method for simultaneous nitrogen and phosphorus removal which includes the following steps: (1) secondary treatment effluent from a wastewater treatment plant is lifted to a mixing device through a pump; (2) a carbon source and a chemical medicament of phosphorus removal are quantitatively put into the mixing device, the addition amount of the carbon source and the chemical medicament of phosphorus are determined according to the water quality; (3) the water to be treated and the medicament are mixed by the mixing device, and filtered in an air-water backwash filter, the water after filtration is discharged or used as reclaimed water. The device has advantages of advanced treatment of the secondary treatment effluent, short treatment flow, low construction investment and operating cost, and high medicament utilization ratio. The treated effluent reaches a first A standard in GB18918-2002, and TN is stable and less than 10 mg / L, the average removing ratio is 42.4%; TP is stable and less than 0.3 mg / L, and the average removing ratio is 77.7%.

Description

technical field [0001] The invention relates to the technical field of resources and environment, in particular to a filtration method for synchronously strengthening biological denitrification and chemical phosphorus removal by adding medicaments. Background technique [0002] With the development of social economy and the aggravation of water pollution, people pay more and more attention to the treatment and protection of water environment. The denitrification and phosphorus removal technology aimed at controlling eutrophication of water bodies is one of the hotspots in the field of water pollution control today. However, low-carbon source urban sewage has become a difficult point in the research of nitrogen and phosphorus removal technology due to the imbalance of nutrient ratio. After the traditional secondary treatment of sewage, the effluent usually still contains a considerable amount of pollutants such as nitrogen and phosphorus. Advanced treatment of urban sewage t...

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Problems solved by technology

The front-end method has a large dosage of chemicals, generates a large amount of sludge, and has high operating costs; the utilization rate of the synchronous method is low, and it will affect the operation of the biological treatment itself, especially the impact of adding aluminum salts. Larger; while the post-placement method uses chemical phosphorus removal agents after the secondary treatment of conventional sewage. The dosage of chemicals is small and the effect is remarkable. Although it needs to increase construction costs, it is still the main method used at home and abroad.

[0006] After the secondary treatment of low-carbon source urban sewage, the nitrogen and phosphorus requirements of the effluent are relatively high, and biological treatment cannot meet the needs. Generally, the carbon source nitrogen advanced treatment device and the chemical phosphorus removal agent are added. Phosphorus advanced treatment devices are connected in series, but this method has the disadvantages of long treatment process, high investment and operating costs, and complicated operation and management.

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