PROFILE OF DISSOLVED GREENHOUSE GAS DISTRIBUTION UNDER IRRIGATION OF TREATED SEWAGE EFFLUENT

Abstract

 Irrigation of treated sewage effluent (TSE) for paddy field should have impact on the emission of GHG such as CH₄ and N2. This study aimed to clarify the impact of the TSE irrigation for paddy field on the GHG emission with dissolved form profile. Survey targeted to the dissolved GHG profile, batch-experiment for CH₄ production potential of soil, and microbial analysis were conducted. The results indicates that dissolved N2 could be decreased in the paddy field contrary to the CH₄ increase, which was caused by biological reduction under anaerobic condition and the CH₄-production promotion due to the inflow of organic carbon from the TSE. This study suggests that the potentially effectiveness of the TSE irrigation for the decrease of dissolved N2 in the TSE, as well as the importance of the concern for the CH₄ production.