环境工程专业英语.ppt

环境工程专业英语
第一页，共13页
Abstract：
An anaerobic hydrogen fermentation system with a thermophilic flow-through reactor (55oC) for hydrogen production and a boiling retention vessel (100oC) for continuous heat treatment, was studied for enhanced continuous hydrogen fermentation using sewage sludge. The performance of the hydrogen fermentation system was tested at various Hydraulic Retention Times (HRTs) ranged from 1 to 5 days. The heat treatment of the fermenting sludge using the boiling retention vessel was an effective to select hydrogen producing bacteria, and to increase the hydrolysis of particulate organics in sewage sludge。
第二页，共13页
Introduction
Commercial hydrogen is almost produced from steam reforming of natural gases and gasification of coal, but these require high-energy inputs obtained from non-renewable resources .With both advantages of hydrogen production and stabilization of organic waste, the anaerobic fermentation is relatively an efficient and inexpensive method compared to the physicochemical methods for hydrogen production .The objective of the study is to develop a continuous anaerobic hydrogen fermentation system with stable hydrogen production by heat treatment, and with high yield of hydrogen by adopting thermophilic condition.
第三页，共13页
Materials and Methods
Experimental Apparatus
Gas sampling pot
Activating reactor
Biogas
Sludge tank
Insutation
Heating Coil
Thermophilic fermenter
Efluent
第四页，共13页
Analysis and Calculations
Biogas production was monitored daily, and its composition was
analyzed by a gas chromatograph equipped with a thermal conductivity detector To analyze the methane and carbon dioxide in the biogas. with a flow rate of 40 mL/min, and the temperatures of theinjector, detector, and column were 80, 90, and 50oC, volatile fatty acid levels and their compositions were analyzed by high-performance liquid chromatography .The mixed liquors were intermittently takenfrom both