ANAEROBIC TREATMENT APPARATUS AND ANAEROBIC TREATMENT METHOD

摘要

Disclosed is an anaerobic treatment apparatus which enables the reduction in the amount of an alkali agent to be used while maintaining the activity of an anaerobic organism at a high level. Specifically disclosed is an anaerobic treatment apparatus which involves a vessel in which an anaerobic organism is contained, wherein an liquid waste containing an organic material can be anaerobically treated with the anaerobic organism in the vessel. The apparatus additionally involves a pH measurement unit for measuring the pH value of water in the vessel and a CO2 concentration measurement unit for measuring the CO2 concentration in a gas in the vessel. The apparatus is characterized in that the degree of alkalinity is calculated based on a measurement value measured by the pH measurement unit, a measurement value measured by the CO2 concentration measurement unit, and the interrelationship among the degree of alkalinity of water in the vessel, the pH value of water in the vessel and the CO2 concentration in a gas in the vessel, and an alkali agent is added to water in the vessel in such a manner that the calculated value of the degree of alkalinity of water in the vessel can be maintained within the range from 1000 to 5000 mg/L.