How to carry out biochemical treatment of wastewater containing hydrocyanic acid
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How to carry out biochemical treatment of wastewater containing hydrogen cyanide (in trace amounts)? 1. The COD of the wastewater is around 28,000； 2. Slightly acidic wastewater. 3. Salt content: 110,000 (sodium chloride). Since this is wastewater generated by a new manufacturing process in the workshop, it is likely that the existing biochemical treatment facilities will not be able to handle it effectively. Reducing the impact of hydrogen cyanide is therefore crucial; could experts please offer some advice or assistance?
1. Is the COD in the wastewater caused by the interference of chloride ions? If there are no other reducing substances such as organic compounds present, then the COD value you measure does not represent the COD generated by organic substances in the wastewater. II. Hydrogen cyanide can be easily treated through oxidation; the treatment difficulty is very low. Further exploration requires more detailed data.
This post was last edited by Bagua Lu on 2011-3-8 at 10:45. Hydrocyanic acid should not have a significant impact on biochemical treatment, as long as it is not of the shock-type; if it is properly managed, the nitrogen contained in it can actually serve as a nutrient source. In the case of shock-type hydrocyanic acid, it is sufficient to add a regulating tank. A too low pH level does warrant attention; it may be appropriate to consider adding some pH regulators.
For this case, it’s simple: just use an electrochemical oxidation device, which ensures effective treatment, low energy consumption, and requires no additional chemicals
With such a high COD value, the nitrogen content should be at least 1400 mg/L or more, so there’s no need to worry.