[Characteristics of high solid content sludge with microwave irradiation].

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.