Process Area Event – 【I See Now-36】Let Things Flow Naturally
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If I speak out about this, I will become the target of everyone’s criticism. I worked at a sewage treatment plant for a year, mainly dealing with the restart of the biochemical system, which had previously stopped functioning. The water discharged from our wastewater treatment plant is sent directly to a wastewater treatment facility for further processing; the discharge standard is COD < 1000. Due to the restart process, it is not possible to have continuous inflow and outflow of water, and the environmental protection authorities do not allow continuous discharge either – discharge is permitted only after tests show satisfactory results. Later, the biochemical system returned to normal; the COD level in the effluent could drop below 200, while that in the secondary sedimentation tank was around 200–380. These values met all the requirements of a wastewater treatment plant, allowing the treatment capacity to increase. As a result, more sludge accumulated in the thickening tank. Even with daily filtration, it can only just manage to cope. However, in addition to being recycled back to the anaerobic tank, the secondary sedimentation tank must have its sludge removed regularly, especially in summer, which increases the amount of sludge that needs to be filtered. Once, during sludge discharge in the evening, the next day I found that there wasn’t much sludge after filtration, so I asked, \"Where is the sludge that was filtered?\" The answer is: Part of it was filtered, and the rest was discharged, flowing away together with the wastewater. “So what about online monitoring? ” “Online monitoring is done at set intervals; as long as you avoid that time, it’s fine.” So, high technology is powerless in some situations, and reliance falls on humans.
Online monitoring is scheduled. . . The problem lies in this timing
In the chemical industry, whether it’s large or small companies, there are practically none that have never engaged in illegal emissions!
I really don’t understand why online monitoring isn’t real-time~~ For the online monitoring system in my company at present, it is monitored 24/7 directly by the local environmental protection agency; once excessive levels of COD are detected, they come to handle the situation the next day, and the management is quite strict~
Thinking that real-time means there’s no problem? Slightly modify the pipeline, connect tap water to it, and a P value can be detected.
You have no idea how strict environmental regulations are these days~~ There are no allowed hidden pipes for discharging waste water; you can’t even use water to clean it – stop joking around! If they catch you, you’ll face serious consequences~
There are clever solutions above, and countermeasures below! Back in the factory, when inspections were conducted, the exhaust systems would be turned off; once no one was around, the exhaust gases were released freely. The workshop was filled with an unpleasant smell all day long, and eventually, whenever there was a bad smell in the entire facility, it was blamed on our workshop. Fortunately, all the parks belong to the same company!
It is monitored 24 hours a day, and the surveillance videos are sent directly to the environmental protection department’s office. The problem is that the timing of sample collection for monitoring is determined by humans; samples are taken 6 times throughout the 24 hours. When the lighting is turned off at night, the video shows a black screen, and it’s not possible to see the water turning dark.
Funny? Do you think I’m just being imaginative? I only found out when it was reported in the media. It was discovered during the treatment of a river in Shenzhen.
There’s nothing that can be done about this. In the past, people adopted a tolerant attitude toward this issue, but now more and more attention is being paid to it; there are also more complaints. No one pays any attention, so people turn to the media and post on Weibo.
Everyone is responsible for protecting the environment; I didn’t realize there were so many rules