Although with the continuous progress of society and the attention of relevant departments, there are still significant problems with water pollution in our country, then may I ask what deficiencies exist in urban sewage treatment plants? Let’s explore this issue together in this chapter! There are mainly the following three deficiencies that we need to be aware of.
1.The Process Control System and the Management Information System may be Separated.
When some cities’ sewage treatment plants establish and plan management information systems, they tend to overlook the information within the control system, which leads to a disconnection between the process control system and the management information system, resulting in the following situations:
1) The lack of accurate and timely original data and its situation analysis;
2) Situations such as excessive information, poor communication and low accuracy;
3) It will also lead to poor planning ability and production imbalance, thereby affecting the normal use of water quality.
2.In Terms of Optimizing Control and Management, Its Process Control Level is not High.
Due to the existence of strong coupling of multiple variables, time-varying parameters, frequent changes in working conditions, and significant issues in sewage monitoring during the sewage treatment process, traditional control systems are unable to achieve optimized management and control of the sewage treatment process. This results in very low rates of opening up and meeting standards after sewage treatment, but high costs, and large fluctuations in effluent discharge indicators. In addition, the design issue of the control system will directly affect whether the process control and operation of sewage treatment can be successfully implemented. Of course, if you organically integrate the operation management of the sewage treatment process with the control system and operation, it will bring autonomy, reliability and flexibility to the sewage treatment. Then, through the optimized design of the full-process automatic control system, the quality of the products can be improved, as well as costs can be reduced and environmental pollution and resource consumption can be minimized.
3.Problems Such as the Formulation of Production Function Plans and Scheduling Relying on Manual Means, Low Efficiency, and Untimely Adjustments Have Emerged.
Although the quality and quantity of sewage at the inlet are both affected by the external environment, the effluent indicators of the sewage must meet the relevant standards after treatment before it can be discharged. In this way, the input of the sewage treatment process will be non-selective, while the output will be compulsory. Any malfunction in any link is very likely to affect the normal operation of the entire processing procedure, so it is necessary to formulate reasonable production operations and scheduling. In the process of sewage treatment production, what we need to do is to ensure that the entire treatment process is closely connected, and the treatment units before and after should be closely linked. It should also be noted that there are issues of flow load balance and time balance in job planning and scheduling. Here, the flow load balance refers to the determination of the production load of each process, the start and stop, as well as the adjustment of the production line, etc. The time balance is the hydraulic retention time of the secondary sedimentation tank, the primary sedimentation tank in the water treatment area, and the sludge consumption time of the biological aeration tank, etc. In the work plan and production scheduling of sewage production, its main purpose is to achieve planned management of each process, so as to balance the load, and reduce the cost of chemicals and energy consumption and other losses accordingly. This will naturally lower the production cost. Judging from the current situation, many sewage treatment plants basically rely on manual production planning for scheduling, which has obviously led to low efficiency and untimely plan adjustments.
From the current situation, the sewage treatment plants in our country still lack supervision and control of the process. The work of real-time monitoring of sewage by using water quality monitoring instruments still needs to be further improved, and supervision and control of the biochemical system should be achieved. In addition, it should have functions such as production data collection, transmission, analysis and management, to realize a comprehensive automated urban sewage treatment system and ensure that all water quality indicators can meet the discharge standards!
