Erdos Lucky Cloud Park
Erdos, Inner Mongolia, China
Lucky Cloud Park will be a mixed-use development surrounding a 20 hectare restored upper reservoir and a new 60 hectare lower reservoir. The project is located in Northern China where water supply is extremely limited. Effluent from the City’s treatment plant will be the primary water source for both reservoirs which will provide irrigation storage for parks, golf courses and other landscaped areas around the City.
- Nutrient Removal facility will reduce nitrogen & phosphorous levels of effluent before entering upper reservoir
- Wetland treatment system will be integrated into an Adventure Park to treat dry-weather nuisance flow, small storm flows, and provide effluent polishing
- 20 hectare upper reservoir and 60 hectare lower reservoir will provide additional effluent polishing through biofilters, aeration, and water quality filters
- Debris basins constructed upstream of each reservoir will capture sediment during storm events reducing lake operations & maintenance and increasing the life-span of each reservoir
In order to maintain high water quality in the reservoirs and avoid an overabundance of algae and nuisance plant growth, the carbon concentration (BOD5) should be less than 2 mg/L, the nitrogen concentration should be less than 1.5 mg/L, and the phosphorus concentration should be less than 0.1 mg/L. In very high quality reservoirs these concentrations are even lower, but the cost to achieve even lower concentrations is cost prohibitive. The water quality goals described will still mandate a high level of treatment because these concentrations are difficult to achieve.
The treatment systems proposed include the following stages:
1) upstream mechanical pretreatment system mainly for carbon and ammonia-nitrogen removal
2) a natural wetland treatment system mainly for nitrate-nitrogen removal
3) a coagulation and sedimentation system mainly for carbon and phosphorus removal
The existing site will be retrofitted from a low-lying organic soil area of shallow ponds into a new treatment system with several benefits in addition to the enhancement of water quality.