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I am currently working on cultivating a strain for treating chemical wastewater containing high levels of chloride ions. The process involves the following stages: equalization tank – UASB – hydrolysis-acidification tank – primary tank – contact oxidation tank – secondary sedimentation tank. The effective volume of the UASB is 700 cubic meters, that of the hydrolysis-acidification tank is 460 cubic meters, that of the primary tank is 110 cubic meters, and that of the contact oxidation tank is 580 cubic meters. The effective volume is the volume when water is present. The current concentration of the incoming water is as follows: COD at 700 ppm, total phosphorus at 5 ppm, ammonia nitrogen at 7 ppm, and chloride ions at 1000 ppm. The COD level of the outgoing water is around 130 ppm. Currently, plans are in place to use wastewater containing 100,000 ppm of chloride ions, together with the existing water, in order to create wastewater with a chloride ion concentration of 5000 ppm for use in the biological treatment system. The corresponding COD level in this wastewater will be around 1500 ppm, while the total phosphorus level will be around 20 ppm. The process will start with a small volume of water for acclimatization, with the volume to be increased to 350 tons per day within one month, ensuring that the outgoing water meets the required standards: COD below 500 ppm. The COD removal efficiency of the UASB tank is very low, below 20%. After providing this background information, I would appreciate it if Everyone teachers could offer some suggestions and experience. Additionally, I would like to ask: Is there anything wrong with this method of acclimatization and the time required for it? What is the maximum allowable inlet chloride concentration while ensuring that the effluent meets the standards? Thank you!
The concentration of sodium chloride that activated sludge can tolerate is 8000–9000 mg/L