Qiao Wei, Wang Wei, Xun Rui, Zhou Gang, Wan Xiao, Xia Zhou
Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China.
Huan Jing Ke Xue. 2008 Jun;29(6):1611-5.
This paper focus on changes of high solid content sludge (7%, 9% and 13%) hydrolysis with microwave irradiation also anaerobic biodegradation of treated sludge was tested by biochemical methane potential (BMP) procedure. Results showed that microwave irradiation provided a rapid temperature increasing. Hydrolysis accelerated the solubilization of volatile suspended solid (VSS) and suspended solid (SS). COD, TOC, NH4+-N, TN, and TP concentration of liquor sludge increased, while pH decreased. Sludge solid content was found to be the most influential parameter. VSS and SS dissolving ratio of sludge with 13% solid content were lower than sludge with 7% and 9% solid content. 23% of VSS and 18% of SS dissolved for 9% sludge at 170 degrees C with 5 min, SCOD of liquor was 41 g/L, and concentration of TOC and NH4+-N were 30 g/L and 1 g/L respectively. Biodegradation of treated sludge improved. Methane production of 9% sludge at 170 degrees C with 5 min and 10 min were 27% and 30.8% higher than that of untreated sludge. Hydrolysis time increasing from 5 min to 10 min brought an improvement of 4%, 3.6% and 5.7% methane production at 120 degrees C, 150 degrees C and 170 degrees C.
本文聚焦于高固体含量污泥（7%、9%和13%）在微波辐照下的水解变化，同时通过生化甲烷潜力（BMP）程序测试了处理后污泥的厌氧生物降解性能。结果表明，微波辐照使温度快速升高。水解加速了挥发性悬浮固体（VSS）和悬浮固体（SS）的溶解。污泥上清液的化学需氧量（COD）、总有机碳（TOC）、铵态氮（NH4+-N）、总氮（TN）和总磷（TP）浓度增加，而pH值降低。发现污泥固体含量是最具影响力的参数。固体含量为13%的污泥的VSS和SS溶解率低于固体含量为7%和9%的污泥。9%的污泥在170℃下微波辐照5分钟，23%的VSS和18%的SS溶解，上清液的溶解性化学需氧量（SCOD）为41 g/L，TOC和NH4+-N浓度分别为30 g/L和1 g/L。处理后污泥的生物降解性能得到改善。9%的污泥在170℃下微波辐照5分钟和10分钟时的甲烷产量分别比未处理污泥高27%和30.8%。在120℃、150℃和170℃下，水解时间从5分钟增加到10分钟，甲烷产量分别提高了4%、3.6%和5.7%。
