Statement (I): Anaerobic sludge digester, by itself, is considered to be the better method than other methods of sludge treatment: Statement (II): During anaerobic sludge digestion, CH4 is produced; also rodents and other pests are attracted when digester sludge is dried.
Statement (I): Anaerobic sludge digester, by itself, is considered to be the better method than other methods of sludge treatment: Statement (II): During anaerobic sludge digestion, CH4 is produced; also rodents and other pests are attracted when digester sludge is dried. Correct Answer Statement (I) is true<strong>;</strong> but Statement (II) is false
The anaerobic sludge digester is a better method for handling the sludge because it produces a large amount of energy in the form of Methane. It also reduces the nuisance of digested sludge and reduces the vectors such as rodents, flies etc. attraction towards sludge.
∴ Statement I is true and Statement II is false
Other points about gas production in anaerobic sludge digester:
1. Out of total volatile solids, 65 % are induced to gasses and 35 % formed in digested sludge.
2. The total volume of gasses formed during digestion is either 0.6 m3/kg of Volatile solids or 0.9 m3 /kg of volatile solids reduce to gasses.
3. Out of the total gasses formed 70 % is methane (CH4) and 30 % is Carbon Dioxide (CO2).