Study of greenhouse gases emission during wastewater treatment process

Recently, the study of nitrous oxide (N₂O) and methane (CH₄) emission in the process of treating domestic wastewater drived more and more people´s attention. N₂O is by-product of nitrification. Some studies showed that N₂O emission influenced by temperature, pH value, DO, salinity and plant species. CH₄ was produced in strictly anaerobic conditions through the reduction of CO₂ by methane bacteria. CH₄ will be consumed in sufficient oxygen circumstances. So CH₄ emissions are depended on the difference between production and consumption of CH₄. And CH₄ influenced by temperature, level of water and plant species in waste water treatment process. It is said that N₂O emissions are something with incomplete nitrification and denitrification, For N₂O control, microbial nitrification and denitrification should be enhanced. For CH₄ control, improving the DO of the system can restrain its transgression effectively.