Anaerobic treatment of domestic wastewater with EGSB reactor
An expanded granular sludge bed (EGSB) reactor was employed to promote COD removal from domestic wastewater in psychrophilic range (13-26℃). Reactor performance and sludge properties were investigated. It was found that COD removal increased with the increase of organic loading rate (OLR) and the shortening of HRT. At temperature above 15℃, the average COD removal were 75, 81, 81 and 82％ with the corresponding OLR of 6, 9, 13 and 16 kgCOD/(m3·d) when HRTs were set at 1.6, 1.2,0.75 and 0.6h. The reactor could endure OLR as much as 38.1kgCOD/(m3·d) with 93％ COD removed. However, the average COD removal cut down to 66％ at HRT of 0.75h when temperature decreased to 13℃. Both sludge size reduction and degranulation occurred when liquid upfolw velocity (Vup) was higher than 3.1m/h, which resulted in sludge bed move upward thus increased the risk of sludge washout. The specific methanogenic activity (SMA) of sludge built up from the original 0.69-0.76gCODCH4/(gVSS·d) to the final 0.96-1.34gCODCH4/(gVSS·d), which indicated an improved reactor efficiency. Therefore, increasing OLR by shortening HRT is an efficient way to enhance the reactor efficiency for EGSB to treat low strength domestic wastewater.
domestic wastewater EGSB reactor COD removal HRT granule size distribution
Liu Xiao Dong Chunjuan Lv Bingnan Wang Yanxia Chen Suyun
School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin, 150090,Chin Department of Environmental Engineering Taiyuan University Taiyuan 030009, China
国际会议
上海
英文
3061-3064
2008-05-16（万方平台首次上网日期，不代表论文的发表时间）