What are the reasons for the high COD in the effluent from coking wastewater treated by the AO process?
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We are a coking plant that uses the AO process. The designed influent COD is 3000, and the ammonia nitrogen level is 300; the COD of the recycled water should be 150. However, at present the COD of the effluent remains around 250. What aspects should we consider to identify the cause?
Is the COD of the A/O influent 3000 and that of the effluent 150? Calculate the load of the biochemical tank, sludge concentration, etc.
It is very difficult to bring coking wastewater up to the required standards. We use all the wastewater that does not meet these standards as makeup water for the circulating water system, and we ensure that this circulating water system does not discharge any waste water. In this way, zero wastewater discharge is achieved, with good results and benefits; it is much better than the previous processing methods. You can give it a try too.
How should organic matter in wastewater be disposed of?
It’s likely to have just evaporated as it flew away.
What is the sludge concentration? How is dissolved oxygen controlled? Perform a microscopic examination
For COD in coking wastewater, the efficiency of biological degradation is not particularly high; it is sometimes also affected by environmental conditions, changes in water quality, sludge concentration, and other factors. It is necessary to gain some experience during the processing process.
I can help you only if you send over the design parameters.
This post was last edited by hflfs on 2016-2-9 at 08:28. The high COD level in coking wastewater is mainly caused by a high oil content; by strengthening the oil removal process for the remaining ammonia water before ammonia evaporation, the COD level in the wastewater resulting from ammonia evaporation can be significantly reduced. You might want to give it a try.