First, understand what the influent and effluent of sewage treatment are. Influent refers to the sewage that needs to be treated entering the treatment plant. This is called influent. What about effluent? After a period of treatment, all the indicators in the water meet the discharge standards, and then it is discharged. This is the effluent. Then why does the situation still occur where the effluent exceeds the standard after the influent treatment is completed? This requires a case-by-case analysis. Here we will give a simple example to illustrate.
The relevant staff members conducted real-time monitoring of the indicators at the water outlet through a Water Quality Detector and found that the ammonia nitrogen data was intermittently discharged beyond the standard. What’s going on here? After investigation by the staff, it was found that some unknown toxic wastewater had entered, causing the influent water quality to seriously exceed the standard. Meanwhile, the biochemical system was impacted, and there were cases of activated sludge death. This has made it impossible for the sewage treatment plant to operate stably according to the original designed influent water quality, thus causing the effluent to exceed the standard.
Of course, the effluent exceeding the standard may also be due to the influence of changes in the surrounding environment, which will lead to a significant difference between the designed water quality standards of the sewage treatment plant and the actual influent water quality. However, the already completed water treatment process is difficult to meet the influent water quality requirements. Moreover, because the compliance technology is not only costly but also hard to obtain, the effluent of some projects cannot stably meet the standards.
What should be done when the above situations occur?
In fact, when the biochemical system is severely impacted, it still takes some time to recover. During this period, it is necessary to promptly discharge the unknown toxic wastewater in the pool. Of course, unstable effluent may also occur during the treatment process. Even so! Under any circumstances, what the staff need to do is to take corresponding emergency measures, inspect and investigate some upstream pipelines, do a good job in online monitoring of the sampled water quality, and pay close attention to the changes in water quality in real time. We should also intensify the investigation of polluting enterprises and the work of pipeline networks to prevent such incidents from happening again as much as possible.
Of course, when it comes to the issue of excessive influent water quality, who should be held accountable for management and supervision? This requires time for investigation! In fact, from the current situation, the supervisory and ownership rights over sewage treatment are rather decentralized. For instance, sewage treatment plants and some sewage networks are under the jurisdiction of the Housing and Urban-Rural Development Bureau, while the Environmental Protection Bureau is only responsible for supervision. In contrast to the situation where the influent exceeds the standard, it should be the Housing and Urban-Rural Development Bureau that is in charge of management. However, the issue of secretly filming the pipelines is still managed by the Environmental Protection Bureau. But it is important to remember one point: no matter how water management is carried out, the sewage treatment plant should do its own job well and follow the relevant requirements for each process. The key is to avoid the above-mentioned situations where the effluent exceeds the standard!
