【HaiChuan – Insights from Others】How do you recycle the wastewater from coking and car washing at your facility for reuse?

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I think it’s not that simple to just let it settle and then wash the car in a cycle, right? ? ? ------------------------------------------Guangzhou Petrochemical Recycles Water from Car Washing in Coking Process 2019-09-09 Source: Sinopec News Network Recently, Unit 2 of the coking facility at Guangzhou Petrochemical has started to recycle the water used for car washing into the sedimentation tank of that unit, where it is used for cooling coke. This approach not only eliminates potential environmental risks but also helps to save water used for cooling coke. To address the problem of coke dust contaminating the factory roads during coke transportation, Unit 2 of the coking plant implements strict controls on vehicles used for transporting coke, requiring drivers to get out of their vehicles and wash the vehicle body and wheels with water before entering or leaving the coke yard. However, how to deal with the wastewater generated from this washing process has long been a concern. Previously, car washing water would be sent to rainwater sedimentation tanks for sedimentation before being taken to the sewage treatment plant; however, when the volume of water was large, it could cause strain on the sewage treatment plant and affect its efficiency. To address this issue, the department established a task force, bringing together the person in charge of the device along with other key personnel to conduct discussions on-site, and ultimately developed a method for recycling wastewater from car washing. They built cofferdams around the loading platform of the coke tank, constructed a new sedimentation tank next to the coke tank, and installed a water pump in that sedimentation tank. The car washing wastewater is directed through cofferdams to this sedimentation tank for sedimentation; when the water level reaches the specified level, a pump will start automatically to draw the settled water into the cold coke water tank for use in cooling coke. Furthermore, this device makes full use of resources by collecting and reusing rainwater, which not only saves water resources but also eliminates environmental risks. (Huang Minqing, Wang Shiwei)