What should be considered when connecting domestic wastewater to industrial wastewater treatment plants?
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The company operates in the aquatic products industry; its wastewater treatment plant is used to treat wastewater generated during the processing of aquatic products. Currently, the COD concentration of the incoming water is between 4000 and 5000, the ammonia nitrogen level is around 100, and the pH is approximately 6.5. The A2O biological treatment method is employed for wastewater treatment. The surrounding communities need to connect their domestic wastewater to our company’s wastewater treatment plant. What is the difference between domestic wastewater and industrial wastewater? Will the inclusion of domestic wastewater have an impact on the current wastewater treatment process? I’d like to ask the experts here for advice
To determine whether connecting to domestic wastewater has an impact, it is necessary to: ① calculate whether the water volume exceeds the designed amount； ②Calculate the organic load in the mixed biochemical tank to determine whether it is within the design range ； If the design meets the requirements, it can be accepted. Personal opinion, for reference only.
The COD of domestic wastewater is generally low, around 500–600, while the ammonia nitrogen level is about 20. Therefore, the inclusion of domestic wastewater helps to improve the quality of the incoming water. It is essential to adjust the process parameters accordingly based on the water quality during operation; for more detailed information, one can consult with environmental protection experts.
The introduction of domestic wastewater has a certain positive effect on the quality of the incoming water, improving the BOD/COD ratio.
The addition of domestic wastewater improves the operation of the wastewater system, contributing positively to an increase in the B/C ratio, the dilution of toxins and salts, and the balance of nutrients.
The disadvantage is that the water volume increases, the hydraulic retention time decreases, the load on the secondary sedimentation tank rises, which may lead to an increase in SS.