What level of hardness should be maintained in the graywater from coal water slurry gasification units to prevent serious issues with the structure of the slag water system?
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I have been working in slurry coal gasification for five years, and I am interested in ways to control the amount of ash water in order to effectively reduce scaling in the slag water system. May I ask, fellow professionals, what level of hardness do you maintain in the ash water?
Based on calcium carbonate: 500 mg/L. The total amount of general hardness and alkalinity should be kept below 1400 mg/L
The water quality differs between the south and the north. The total hardness in the south is generally below 1000, while it is slightly higher in the north.
The main substances that cause scaling in gray water are MgCO3 and CaCO3, which have extremely low solubility in water. The factors affecting scaling are mainly alkali, hardness, water pH, and the amount of dispersant added. Generally, graywater hardness is controlled at
What do COD and BOD mainly measure?
It can only be slowed down, not avoided; with no impact on the system’s long-term operation, economic efficiency is the primary consideration.