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Publications (2)0 Total impact

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    ABSTRACT: Thermal hydrolysis characteristics of high solid content (7%, 9% and 13%) sludge were studied by thermal hydrolysis test. Anaerobic biodegradation of treated and untreated sludge and the relation of sludge flowability and sludge solid content were tested by biochemical methane potential (BMP) procedure and theological test, respectively. Results show that the dissolving ratio of solid organics increase with the prolonging of thermal hydrolysis time, and solid organics dissolve slowly after 30 min. Solid organics dissolving ratio of sludge with 7% solid content is higher than that of 9% and 13% sludge. The dissolving ratio of suspended solid (SS), volatile suspended solid (VSS) and COD of sludge with 7% solid content at 170 degrees C with 30 min were 43%, 47%, 42% respectively, and VFA/SCOD is 20.2%. Anaerobic biodegradation of treated sludge is improved. Methane production of 7%, 9% and 13% sludge at 170 degrees C with 30 min were 44%, 27% and 9% higher than that of untreated sludge. Methane production ratios increased 63%, 74% and 37% respectively. Methane content and methane production ratio of 9% sludge is higher than that of 7% and 13% sludge. Yield stress increases slowly with the increasing of solid content when solid content is lower than 9%, and it increases much faster and leads a steep decrease of sewage sludge flowability as solid content is higher than 9%.
    Huan jing ke xue= Huanjing kexue / [bian ji, Zhongguo ke xue yuan huan jing ke xue wei yuan hui "Huan jing ke xue" bian ji wei yuan hui.] 07/2010; 31(7):1583-9.
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    ABSTRACT: 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.
    Huan jing ke xue= Huanjing kexue / [bian ji, Zhongguo ke xue yuan huan jing ke xue wei yuan hui "Huan jing ke xue" bian ji wei yuan hui.] 07/2008; 29(6):1611-5.