How is COD generated in the ash water from gasification?
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How is COD generated in the ash water from gasification?
It is likely that during the gasification process, some of the coal does not get completely converted into CO and H2, and remains in the form of large molecular organic compounds. During the graywater spraying process, these organic substances dissolve in the water, resulting in a high COD level in the graywater or blackwater.
COD, chemical oxygen demand, is resulting from the incomplete combustion of coal in the gasifier.
Is it true that increasing the operating temperature can reduce the COD level?
Coal contains coal tar in itself, which cannot be completely decomposed； Some of the hydrocarbons generated during operation are washed away ； Some manufacturers use wastewater with a high COD level for coal grinding, but the waste cannot be completely decomposed ； Pump leaks enter the water system through the gutter.
COD is related to the content of formic acid in syngas; furthermore, poor on-site management of gasification units leads to severe leaks, and wastewater entering the system affects COD levels.
COD is related to the amount of formic acid formed in the quenching chamber; the more formic acid there is, the higher the COD
Carbon monoxide reacts with water vapor to produce a small amount of formic acid, which is a strong reducing agent.