Journal of Environmental Engineering Technology ›› 2011, Vol. 1 ›› Issue (2): 118-122.doi: 10.3969/j.issn.1674-991X.2011.02.020

• Water Pollution Control Technology and Resource Utilization • Previous Articles     Next Articles

Optimization the Parameters of UZBAF for Treatment of Rural Sewage

LIU Jin1,NAN Guo-ying2,YANG Tian-xue3   

  1. 1. Zhangjiakou Environmental Monitoring Station
    2. Hebei Construction College
    3. Chinese Research Academy of Environmental Sciences
  • Received:2010-09-20 Revised:2010-11-29 Online:2011-03-20 Published:2011-03-01
  • Contact: YANG Tian-xue

Abstract: The water pollution was increasingly serious recently in China, and the rural sewage pollution accounted for high proportion. The up-flow biological aerated filter (UZBAF) with inner diameter of 185 cm and with 54 L of built-in natural zeolite filter sand was used in the demonstration base for harmless treatment of rural sewage. The results showed that under the conditions of hydraulic loading 2 m3/h and residence time 1.0 h, when the gas-water ratio increased from 2∶1 to 4∶1, CODCr average removal rate increased from 75.2% to 83.4%, BOD5 removal rate increased by 5.9%; turbidity removal rate increased from 91.9% to 94.8%, NH4+-N average removal rate increased from 82.6% to 98.1%, NH4+-N average concentration of the effluent fell from 3.3 mg/L to 0.28 mg/L; the removal rate of TN, TP, alkalinity and conductivity was 56.2%, 26.7%, 27.5% and 10.8%, respectively; and the removal rate of bacteria and ascaris eggs was 99.9% and 100%, respectively. The effluent could reach the target of the first-grade discharge standard of Synthetical Draining Standard of Sewage (GB 8978-1996). It was concluded that under the conditions of hydraulic loading 2 m3/h and residence time 1.0 h, UZBAF devices could realize harmless treatment of rural sewage.

Key words: up-flow biological aerated filter (UZBAF), zeolite, rural sewage, NH4+-N