Photo shows the view of Caiyun Lake Wetland Park in Jiulongpo District of southwest China's Chongqing Municipality. (Xinhua/Huang Wei)
BEIJING, Dec. 1 (Xinhua) -- Caiyun Lake Wetland Park is one of the first national level wetland parks in Jiulongpo District of southwest China's Chongqing Municipality. Once known as a notorious stinking ditch locally, the area has seen continuous efforts in water pollution treatment, transforming what was once polluted waste water into lucent lake water.
In 1999, Jiulongpo started the first comprehensive water management. More than twenty upstream garbage dumps were closed, over six million tonnes of waste were disposed of, and 45,000 square meter of dumpsite was shut down and reforested. Several coastal enterprises relocated entirely and sealed their sewage outlets, while new facilities such as sewage networks and tunnels were constructed.
In 2005, Jiulongpo began the construction of the Caiyun Lake Wetland Park project. The park intercepted surrounding domestic sewage and initial rainwater for treatment. The treated water passes through artificial wetlands for further purification before becoming the primary water source for the lake.
By 2007, the Caiyun Lake sewage treatment plant was completed and put into operation, with a daily processing capacity of 17,000 tonnes of sewage water.
As demands for ecological and environmental quality have continued to rise, and as the volume of incoming wastewater increased, the Caiyun Lake sewage treatment plant began an expansion and standard enhancement project. In March of this year, it was completed and put into use, with the daily wastewater treatment capacity reaching 30,000 tonnes.
After the enhancement, the annual operating energy consumption of the Caiyun Lake sewage treatment plant is expected to be reduced by 30 percent, with an estimated annual carbon emission reduction of about 1,456 tonnes.
Today's Caiyun Lake Wetland Park boasts over 300 species of aquatic plants and animals among its natural landscape resources. Clusters and groves of suitable trees like sweet osmanthus and cherry blossoms form scenic landscapes, while egrets, herons, and kingfishers compete to make their homes there.
(Edited by Tian Shenyoujia with Xinhua Silk Road, firstname.lastname@example.org)