Why should sludge dosage be considered comprehensively in anaerobic digestion?

In anaerobic digestion, the reason of sludge dosing rate should be considered comprehensively: dosing rate = the amount of sludge entering the digester every day/the volume of digester, which reflects the average residence time of sludge in the digester to some extent, so the average residence time is equal to the reciprocal of the dosing rate, 1/0.04=25 days.

The ratio of dosage to total amount is generally used for anaerobic digestion test of sludge. After the effective volume of sludge in the digester is consumed, sludge needs to be added once a day, and the ratio of the added amount to the effective volume of the digester is the added rate. The volume dosing rate and sludge dosing rate are basically the same. Volume dosing rate refers to the volume of raw sludge that can be borne by the unit volume in the reactor in unit time.

temperature

During anaerobic digestion, the temperature ranges from low temperature to high temperature. For example, methanogenic bacteria living at extremely low temperatures were found in Arctic sewers. Usually we divide the temperature range into three categories according to microbial activity: one is psychrophilic, and the temperature range is from 10℃ to 20℃; ? —Class A is moderate temperature type, and the temperature range is 20-45℃; 37℃ is usually used; One is thermophilic, the temperature is between 50~65℃, usually 55℃.