[Running effects affected by sludge reducing by anaerobic hydrolysis-acidification and aerobic oxidation process of A1/A2/O bio-treatment system].
In the A1/A2/O bio-treatment system dealing with alkali minimization and dyeing-printing wastewater, residual sludge could be reduced effectively by recycling of sludge. The COD removal rate in A1 segment could be improved by residual sludge recycling to A1 segment. The COD elimination rate in A1 segment was raised from 15.9% to 23.9% and from 12.3% to 22.8% while the COD volume loading of A1 segment was 2.54 kg/(m3 x d) and the HRT of A1 was 9.45 h and 7.56 h respectively. The recycling of sludge is useful to color removal of the system. When the COD of influxion was 1000 mg/L, the COD volume loading of A1 was 2.54 kg/(m3 x d), the chroma of influxion was 450 and the temperature of the system was 30 degrees C, the chroma removal rate with sludge recycling decreased more than 30% and about 30% compared with the system without sludge recycling in A1 segment and in the whole process respectively. The pH in A1 segment with sludge recycling was a little lower than that without sludge recycling, but the performance of A1 and O segments was affected less severely by sludge recycling. The SS in every segment with sludge recycling was higher than that without sludge recycling. Inert substance could be accumulated because of long time sludge recycling and it's necessary to activate the sludge by aerating and washing.
Yang
Bo
B
College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China. yangbo@dhu.edu.cn
Chen
Ji-Hua
JH
Xi
Dan-Li
DL
Li
Fang
F
Tian
Qing
Q
Xu
Shi-Liang
SL
D001420:Bacteria, Aerobic / Q000378:metabolism*; D001673:Biodegradation, Environmental; D006868:Hydrolysis; D007220:Industrial Waste / Q000032:analysis*; D010084:Oxidation-Reduction; D012722:Sewage / Q000737:chemistry* / Q000382:microbiology; D014865:Waste Disposal, Fluid / Q000295:instrumentation / Q000379:methods*
D007220:Industrial Waste; D012722:Sewage