[Comprehensive Analysis and Emission Reduction Pathway of GHG Emissions at a Wastewater Treatment Plant in Suzhou].

Taking a sewage treatment plant in Suzhou City, Jiangsu Province, as an example, the greenhouse gas （GHG） emissions generated in the sewage treatment system were calculated using the carbon balance method and the emission factor method. The environmental impacts and economic aspects of different treatment units in wastewater treatment plants were analyzed using life cycle assessment, cost-benefit analysis, and data envelopment analysis models, and emission reduction pathways were proposed. The results indicated that the total GHG emissions （in terms of CO） from a certain municipal wastewater treatment plant in Suzhou were 6 653.

Pollution tolerant protozoa in polluted wetland.

This study for the first time confirmed that eight dominating protozoan species, Cryptomonas erosa, Euglena axyuris, Euglena caudate, Euglena gasterosteus, Euglena acus, Vorticella campanula, Vorticella convallaria and Epistylis lacustris, were the pollution tolerant species at chemical oxygen demand 54-104mg/L. These species cannot be used as indicator for clean water quality as commonly believed. The protozoa can be actively participating in the energy transfer chain between nano-planktonic and higher plants in polluted wetlands.