For the design of a wastewater treatment plant, with COD=3620 mg/L and BOD=250 mg/L, indicating very low biodegradability, what treatment process should be used?

1 Coagulation-precipitation method: Among the physicochemical methods, the relatively economical coagulation-precipitation method is preferred. Generally, after coagulation treatment, not only can the concentration of pollutants be effectively reduced, but the biodegradability of the wastewater can also be improved. Common coagulants used in the treatment of wastewater from the pharmaceutical industry include: polyferric sulfate, ferric chloride, ferrous salts, polyaluminum chlorosulfate, polyaluminum chloride, polyaluminum chloroferric sulfate, polyacrylamide (PAM), etc. The disadvantages of the flocculation and sedimentation process are: it generates a large amount of chemical sludge; the pH value of the effluent is low and its salt content is high; the removal rate of ammonia nitrogen is low. Therefore, even though it offers good treatment results, careful consideration should still be given when choosing it. 2 Air flotation method: The air flotation method typically includes various forms such as air inflation flotation, dissolved air flotation, chemical flotation, and electrolytic flotation.

It is necessary to understand the organic components in wastewater, as well as its salt content, SS, pH, ammonia nitrogen, temperature, TP, etc. Data collection is used to select a suitable treatment process, which is then tested in the laboratory.

It is not possible to select a process plan based on just these two pieces of data.

Industrial wastewater? What is the production process, and what substances do COD originate from? You can try hydrolytic acidification for a longer period to see if it’s possible to increase the B/C ratio slightly.

We have a medication that can solve this problem; the cost just needs to be determined after testing.

We have specialized agents for this purpose, developed using pure American technology; they offer excellent results at low costs. If you’re interested, feel free to contact me for more details. We can also send a sample free of charge, or have our technical experts come on-site to develop a solution for you

The biodegradability of the wastewater is low; advanced oxidation followed by biological treatment is considered, but this still needs to be tested on a small-scale and pilot scale

These two pieces of data alone are not sufficient to determine a specific plan; relevant pilot tests can be conducted first. Preliminarily consider advanced oxidation processes. Feel free to contact me if you're interested!

Hydrolysis acidification + aerobic treatment + MBR; advanced oxidation processes can be appropriately considered in the earlier stages

Specific water quality information is required: whether it contains oil； Are there naphthenes or something like that? ； How about nitrogen and phosphorus, what is the ratio? ； Water discharge requirements ； How can one write a plan without these?