Water treatment Q&A

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1. The tines of the grid are not consumable items; if they break easily, what are the reasons for that? Answer: If the teeth of the grid rake are damaged, the possible causes include deformation of the grid bars ； The underwater bearing is broken ； Severe scaling. 2. For the concentrated wastewater from pharmaceutical production, with a COD level of over 100,000, what are the common pre-treatment methods? Answer: Pharmaceutical wastewater contains large amounts of COD, SS, salts, and other substances; it also has a very high color intensity, and toxic substances are present in it as well. Due to the complexity of these pollutants, it is difficult to meet the required standards using biochemical treatment methods for such wastewater. Therefore, pre-treatment is carried out using polyferric sulfate coagulation as a physical-chemical method before applying biochemical treatment. 3. What is the water content after dehydration using a centrifuge? Answer: Theoretical value is below 80, while the actual value is between 75 and 85. 4. What are the precautions for operating a secondary sedimentation tank with a diameter of 52 meters? Answer: It has a large footprint, which helps control the backflow and prevents sludge from floating to the surface over an extended period of time. 5. There is wastewater with a moderate flow rate that needs to be introduced into the plant; the pH of this wastewater is 5 and its COD level is 800 mg/L. What method should be used for neutralization? Answer: It is necessary to test the incoming water for conventional parameters such as pH, total phosphorus, total nitrogen, COD, BOD, and ammonia nitrogen. Then, the volume of water entering and the daily treatment capacity are compared, so as to adjust the amount of acidic wastewater fed in accordingly based on the actual conditions. 6. To improve the SBR process by adding a stage of V-type filters for higher treatment standards, where is the appropriate location to add chemicals if TP removal is desired? Answer: It mainly depends on how much total phosphorus needs to be removed. With our CAST process, the total phosphorus level in the effluent is between 1 and 2, while the required level is 0.5. There is no sedimentation tank between the reaction tank and the V-type filter, and the system operates well. If it is necessary to remove high levels of total phosphorus and a large amount of chemicals must be used, it is advisable to install an efficient sedimentation tank in between.