Affiliations: School of Environmental Science and Engineering,
Shanghai Jiao Tong University, Shanghai, 200240, China | School of Municipal and Environmental Engineering,
Shenyang Jianzhu University, Shenyang 110168, China | Guangdong Jiujiang Distillery Co., Ltd., Nanhai
528205, China | Matsudo Research Laboratory, Hitachi Plant
Technologies., Ltd., Tokyo, Japan
Abstract: The distillery wastewater of Guangdong Jiujiang Distillery, which is
characteristic of containing high organic matters and rich total nitrogen, was
treated by a combination of methane fermentation and
denitrification/nitrification processes. 80% of COD in the raw wastewater was
removed by methane fermentation at the COD volumetric loading rate of 20 kg
COD/(m^3·d) using the expanded granule sludge bed
(EGSB) process. However, almost all the organic nitrogen in the raw wastewater
was converted into ammonia by ammonification there. Ammonia and volatile fatty
acids (VFA) remaining in the anaerobically treated wastewater were
simultaneously removed utilizing VFA as an electron donor by denitrification
occurring in the other EGSB reactor and nitrification using PEG-immobilized
nitrifying bacteria with recirculation process. An aerobic biological contact
oxidization reactor was designed between denitrification/nitrification reactor
for further COD removal. With the above treatment system, 18000–28000
mg/L of COD in raw wastewater was reduced to less than 100 mg/L. Also, ammonia
in the effluent of the system was not detected and the system had a high
removal rate for 900–1200 mg/L of TN in the raw wastewater, only leaving
400 mg/L of nitrate nitrogen.
