Improved Nitrogen and Phosphorus Removal Biofilm Wastewater Treatment Process

Source: B&R Working Committee

Applicating Company

Jiangsu LiDing Environmental Protection Equipment Co., Ltd.

Technology Name

Technical principle

Combing with biological contact oxidation process, enhanced denitrification and phosphorus removal multi-stage AO technology, front denitrification denitrification AO technology and MBBR traditional fluidized bed process, improved enhanced denitrification and phosphorus removal biofilm wastewater treatment technology mainly applies AO process. AO technology strengthens the wastewater nitrogen removal and phosphorus removal through flow of anoxia → aerobic. AO process is adaptable to water quality and quantity changes, especially for low concentration wastewater. The biofilm method has far better treatment performance than the common activated sludge method and can achieve stable effluent standards. AO technology is mainly used in low energy consumption decentralized wastewater treatment systems.

Scope of application

Mainly used for rural scattered domestic sewage treatment, rural environmental centralized improvement in domestic sewage treatment, up to standard discharge or reuse of water, rural reconstruction, small-scale of sewage treatment stations, high-speed service areas, camp posts, farmhouses, tourist attractions, temples, expressway service stations, sanatoriums and other scattered domestic sewage treatment.

The equipment models are diverse. Improved biological contact oxidation process is adopted, and ecological treatment units can be added according to the site and water quality requirements. For the alpine region,heat preservation measures shall be taken for frozen soil layer.

Process flow and description

Process of AO technology：Domestic sewage Sewage is collected through the sewerage system；The sewage is discharged to the civil conditioning tank of the sewage treatment station；Solid contaminants are collected. LD-SC advanced treatment of sewage through PLC integrated automatic control lifting pump；Finally the wastewater is treated to the standard through anaerobic and aerobic biochemical reactions.

Promotion prospects

At present, there are many types of domestic wastewater treatment technologies in rural areas in China. Decentralized treatment technologies are mainly applied to anaerobic digesters, small artificial wetlands, oxidation ponds, stabilization ponds, etc. However, due to the less developed economy in rural areas and the scattered layout of rural settlements, the existing technologies often have problems such as large investment, high management and care requirements, and poor treatment effects. Most of the treatment technology model is along the municipal sewage treatment technology model, failing to fully integrate the rural economy and natural conditions, production and living habits, sewage composition and other basic conditions, failing to rural domestic sewage, agricultural production waste organic combination, properly solve the sewage problem. Some contrary to the laws of the treatment technology model, and even the rural scattered surface pollution concentration, the formation of point source pollution, the local water and soil caused by "secondary" pollution. These have become a comprehensive promotion of the beautiful countryside construction of technical bottlenecks.

Decentralized rural wastewater treatment technology will become the main rural domestic wastewater treatment technology. Based on the current situation of China's rural wastewater treatment, the integrated treatment equipment of 100-ton scale with simple operation, high automation and simple management will become the main technology trend. Meanwhile, with the innovative thinking of Internet, the management of sewage treatment stations and facilities with intelligent sensing capability + mobile communication network will also be the direction of technology development.

Our LD-S series equipment, with more than 40 independent patents, has been widely used in Jiangsu province, Anhui province, Henan province, Shanghai city, Zhejiang province, Hunan province, Hubei province and so on and more than 500 administrative villages, over 5,000 natural villages, as well as agricultural caravans, tourist attractions, schools, hospitals, highway service areas, villas and other pipeline networks and other uncovered areas. Currently our business has covered almost all municipal villages and 80% of the county-level villages.

The improved biological contact oxidation integrated wastewater treatment technology will hardly cause secondary pollution because the special process can eliminate the odor to some extent. Electrodephosphorization and biofilm processes help to reduce sludge production. At present, improved biological contact oxidation AO wastewater treatment technology is widely used. Sewage is treated in stages. The treated sewage is discharged into the river to effectively control water pollution and improve water quality.