Huaifang Water Reclamation Plant

With a treatment capacity of 600,000 m3/d, this is the largest underground water reclamation plant in the world.

Treatment structures for this facility are all built underground and artificial wetland is constructed above ground. Providing sewage treatment and sludge treatment that adopts the process of “thermal hydrolysis + anaerobic digestion + plate-and-frame dehydration” to realise the resourceful utilization of sludge and biogas.

The reclaimed water is used to replenish rivers and lakes, municipal miscellaneous water, industrial cooling water, etc. The project not only improves the quality of surrounding water
environment, but also alleviates the water resource shortage situation in Beijing.

Mega-cities often face water resource shortage, high energy consumption for wastewater treatment, land scarcity and deterioration of ecological environment during urban development. Huaifang Water Reclamation Plant (HFWRP) was constructed to meet the upgrading standards for wastewater treatment and improve water ecological environment in the southern part of Beijing.

HFWRP reduces pollutants, provide additional water source for Beijing, realise resourceful utilisation of sewage sludge, and improve aquatic environment. Together with reservoir water and the South to North Water Diversion project, it constitutes the third of three major water sources for Beijing.

The strategies to reduce impact on surrounding environment involved putting wastewater treatment facilities underground and building an over-ground ecological wetland park with reclaimed water, which is open to the public.

MBR technology is used to provide high quality reclaimed water as replenishing water for rivers and lakes, and the water environment is improved at the same time. Additionally, sewage sludge is treated with thermal hydrolysis & advanced digestion process to produce
biomethane, which is used to generate electricity. The treated sludge is utilized as
land resource.

Anammox process is used to reduce nitrogen load and treatment cost of digested liquid.