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Original title: Three reclaimed water plants in Chengdu completed their upgrade and renovation
The Ninth Chengdu Reclaimed Water Plant completed the upgrade and transformation, and carried out the purification of the water supply.
The production and use of reclaimed water occupies an important place in the urban water circulation system. On December 31, 2020, the Chengdu Environmental Group reporterthe companyThe sixth, seventh and ninth reclaimed water plants in Chengdu are known to have completed the upgrade and transformation, and carried out purification of the water supply. After upgrading and transformation, the water quality of the three reclaimed water plants reached the standard for reclaimed water use. A total of 1.2 million tons of reclaimed water are produced per day. Among them, the Ninth Reclaimed Water Plant in Chengdu is the largest reclaimed water plant in southwest China, producing 1 million tons of reclaimed water per day. .
After update
Better effluent water quality
Why upgrade and reform? According to the head of Chengdu Environment Group affiliated drainage company, the sixth, seventh and ninth reclaimed water plants in Chengdu have implemented the first level standard A of the Pollutant Discharge Standards for Urban Wastewater Treatment Plants (GB18918 -2002) before leaving the factory. As the environmental protection requirements are higher and higher, after improvement and renovation, the water produced by the three reclaimed water plants will implement the “Water Pollutant Discharge Standards for Minjiang and Tuojiang Rivers in the Province Sichuan “(DB51 / 2311-2016).
According to the “Water Pollutant Discharge Standards for Minjiang and Tuojiang Rivers in Sichuan Province” (DB51 / 2311-2016), wastewater treatment plants with a daily treatment capacity of more than 1,000 tons they must be updated and the effluent quality must be stable and meet the standard. The design scale of the Chengdu No. 6 reclaimed water plant is 100,000 tons per day, the design scale of the Chengdu No. 7 reclaimed water plant is 100,000 tons per day, and the design scale of the reclaimed water plant Chengdu No. 9 is 1 million tons per day. Standard transformation.
“The main reason is that the effluent standards have changed.Production capacityAnd the capacity to use recycled water remains unchanged for now. “The relevant person in charge of the Chengdu Environment Group drainage company said that before renovation, the treated water should be addedProcessIt can be used as reclaimed water. After improvement and transformation, the treated water does not require otherArt, It will directly meet the standard for the use of recycled water and the effluent quality will be better.
Add two treatment processes
Make the effluent indicators reach the standard stably
How to update the standard? “The treatment capacity of the three reclaimed water plants will remain unchanged after upgrading and transformation, but the treatment process has been added and the latest treatment process’ high density sedimentation tank + filter has been used. denitrification ‘”. According to the person in charge of the Chengdu Environment Group drainage company, Through advanced treatment, the content of total nitrogen (TN) and total phosphorus (TP) in the water is further reduced, so that the index of effluent can stably meet the requirements of relevant standards.
According to the competent person in charge of the Chengdu Water Affairs Bureau, the scale of utilization of reclaimed water continues to grow, and multiple channels are used to supplement ambient water in small and medium rivers in the Jinjiang River Basin. It can be seen that the reclaimed water plant is an important “power supply station” for rivers and lakes.
Glossary
Recycled water
Reclaimed water is water that can be used beneficially after sewage or rainwater has been properly treated to achieve a certain water quality index.
(Source: West China Metropolis Daily)
(Editor in charge: DF387)
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