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Wastewater treatment is an important task in current environmental protection work, and different treatment processes need to be adopted for different wastewater properties. In wastewater treatment processes, hydrolysis acidification tank and anaerobic tank are two commonly used steps, which have both similarities and certain differences@@ Hydrolysis acidification tank is a part of the wastewater treatment process, located in front of the biochemical tank. Its main function is to hydrolyze and acidify organic matter, breaking down organic waste into smaller organic molecules. These organic molecules can be more easily decomposed and degraded by the microbial community in the subsequent treatment stage. Hydrolysis acidification tanks are usually operated under anaerobic conditions, which lack oxygen and allow organic matter to ferment and decompose@@ In contrast, anaerobic tanks are another step in the wastewater treatment process, closely following hydrolysis and acidification tanks. The function of anaerobic tanks is quite complex. They can not only further decompose organic matter, but also reduce nitrate and sulfate in wastewater through the action of anaerobic microorganisms, reducing the nitrogen and sulfur content in the water. The anaerobic microorganisms in the anaerobic tank utilize organic matter for metabolism, producing small amounts of methane and carbon dioxide, which are reusable energy sources@@ In general, hydrolysis acidification tanks and anaerobic tanks play a crucial role in the wastewater treatment process. Their differences are mainly reflected in their mechanism of action and treatment effect. The hydrolysis acidification tank mainly decomposes organic matter into smaller molecules through hydrolysis and acidification, providing the source of organic matter for subsequent treatment steps. Anaerobic tanks further decompose organic matter, reduce the nitrogen and sulfur content in wastewater, and generate reusable energy@@ In practical applications, hydrolysis acidification tanks and anaerobic tanks are usually used in combination. By organically combining the two, higher wastewater treatment efficiency can be achieved. The combination of hydrolysis acidification tank and anaerobic tank can improve the degradation efficiency of organic wastewater and reduce the workload of subsequent treatment units. In addition, through reasonable operation control, the generated energy such as methane and carbon dioxide can be maximally utilized to achieve energy regeneration and utilization@@ In summary, hydrolysis acidification tank and anaerobic tank are two indispensable links in the wastewater treatment process. They provide a good foundation for subsequent wastewater treatment through hydrolysis and acidification, further decomposition and reduction, etc. Reasonably combining these two processes can improve wastewater treatment efficiency, reduce resource waste, and also make a positive contribution to environmental protection work.