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Process design of integrated sewage treatment equipment What truly impresses you about a good product is not necessarily the final finished product itself, but rather the efforts invested in its development – including its design, manufacturing process, and operation. All these aspects help to demonstrate its true value. Of course, in today’s fast-paced society, some manufacturers, in an effort to meet deadlines, overlook the quality of their products, which leads to a loss of trust among consumers. A good product is one in which there is no element of deception throughout the entire process, from the materials used in production to after-sales service. Nowadays, people place increasing emphasis on environmental protection and green, healthy practices, and progress in this area is accelerating. The related products available vary in quality. So what constitutes a good product, and what constitutes good engineering design? Today, we will take a closer look at the engineering design of integrated sewage treatment systems. Issues that require special attention in the design of integrated wastewater treatment equipment: 1. Composition of the facility – In principle, this method does not involve the use of a primary sedimentation tank. The main reason for applying this method to small wastewater treatment plants is that the facilities are simpler and their maintenance and management can be carried out more centrally. To adapt to changes in flow rate, the volume of the reaction tank should have a margin, or methods such as setting operating cycles should be employed. However, in locations such as tourist sites where traffic volume varies greatly, the installation of a flow regulation tank should be considered based on maintenance requirements and economic factors. 2. The reaction tank is of fully mixed type; it is very compact and occupies little space. The shape is rectangular, with the ratio of pool width to length being approximately 1:1 to 1:2, and the water depth is 4 to 6 meters. (1) An excessively large water depth in the reaction tank is uneconomical for the following reasons: ① If the water depth in the reaction tank is large, the depth of the water to be discharged also increases, which in turn prolongs the sedimentation time required for solid-liquid separation. ②Due to structural limitations, the dedicated supernatant discharge device does not allow the depth of the discharged supernatant water to be too great. (2) An excessively shallow water depth in the reaction tank is undesirable for the following reasons: ① During drainage, due to the limitation imposed by the minimum water depth above the activated sludge surface, the depth to which the supernatant can be discharged cannot be too great. ②Compared with other treatment methods for the same BOD―SS load, its advantage is that it requires less land area. Considering factors such as cleaning and maintenance, the number of reaction tanks should be at least 2 in principle. A tank can also be built when the scale is small or the amount of wastewater is low in the early stages of operation. 3. Drainage system: The drainage system is an important aspect of the design for the SBR treatment process; it is a distinctive feature of this design and a key element that determines the success or failure of the system’s operation. Currently, the SBR drainage systems reported domestically and internationally can be roughly classified into the following types: (1) single-point or multi-point drainage using submersible pumps. This method consumes a lot of electricity and is prone to sucking in settled sludge; (2) Drainage is achieved by fixing valves at multiple points at the ends (sides) of the tank, with the valves being opened from top to bottom. Disadvantages: it is not convenient to operate, and drainage tends to carry mud; (3) Special equipment: decanter.