Effects of operational factors on soluble microbial products in a carrieranaerobic ba ed reactor treating dilute wastewater
FENG Huajun , HU Lifang , SHAN Dan , FANG Chengran , HE Yonghua , SHEN Dongsheng
DOI:
Received August 02, 2007,Revised November 14, 2007, Accepted , Available online
Volume 20,2008,Pages 690-695
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The effects of feed strength, hydraulic residence time (HRT), and operational temperatures on soluble microbial product (SMP)
production were investigated, to gain insights into the production mechanism. A carrier anaerobic ba ed reactor (CABR) treating
dilute wastewater was operated under a wide range of operational conditions, namely, feed strengths of 300–600 mg/L, HRTs of 9–
18 h, and temperatures of 10–28℃. Generally, SMP production increased with increasing feed strength and decreasing temperature.
At high temperature (28℃), SMP production increased with decreasing HRT. As the temperature was decreased to 18 and 10℃, the
SMP production was at its peak for 12 h HRT. Therefore, temperature could be an important determinant of SMP production along
with HRT. A higher SMP to soluble chemical oxygen demand (SCOD) ratio was found at high temperature and long HRT because of
complete volatile fatty acid degradation. SMP accounted for 50%–75% of the SCOD in the last chamber of the CABR. As a secondary
metabolite, some SMP could be consumed at lower feed strength.
