Why is the COD of the ammonia-evaporation wastewater from coking plants over 4000, making biochemical treatment difficult?
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Why is the COD of the ammonia-evaporation wastewater from coking plants over 4000, making biochemical treatment difficult? Could the experts please help analyze whether it’s possible to reduce it using PAM?
PAM has little effect; this can be compared with previous situations. Operating from the top of the coke oven could be considered, as the temperature in that area has a significant impact. What about the oil content?
First, check whether the remaining ammonia water oil removal system is functioning properly, whether the oil level in the mechanical clarification tank is too high, and whether there is any blackening of the ammonia water accompanied by oil bubbles； Second, check whether the coke oven is operating properly and whether the temperature in the roof space is too low
What equipment is available for removing oil from residual ammonia water?
What is the COD level of the incoming water? Knowing this is necessary to determine which stage of the process is problematic
Is a COD level of over 4000 in wastewater still high? Here, keeping it below 5500 is sufficient. You can test the COD level using ammonia water, and by comparing it with the COD values of the wastewater, you can determine how much the COD level can be reduced from its source to the point where it reaches the wastewater. If the source is of high quality, investigate the issue at the source; if there is no problem there, then check the intermediate stages.
Reason: Phenols are toxic to the microorganisms used in biochemical treatment. Solution: First, carry out defoaming treatment on the wastewater.
4,000 or so isn’t considered high; it’s better to use a portion of the water from the biochemical treatment process for cooling tower wastewater and domestic sewage