摘要
规模化猪场养殖排放的废水对周边水环境的影响不容忽视。该研究采用复合处理的方法,探索了以低强度超声波强化A2/O生物反应器高效处理规模化猪场养殖废水的新工艺。经检测,通过间歇超声的强化模式对水质改善有明显作用但波动性较大;而采用连续超声模式,处理后出水中各污染物的去除率在原有A2/O生物反应器处理的基础上大大提高,COD、BOD5、氨氮、总磷的浓度分别下降到了41~57、3~8、6~12、0.09~0.8 mg/L的范围内,达到了《城镇污水处理厂污染物排放标准》(GB 18918-2002)一级B的水质要求。猪场养殖废水处理的实际运行效果表明,该强化方法处理效果良好,运行稳定,可实现猪场养殖废水的达标排放。
With the development of large-scale pig farms in recent years, swine wastewater discharged from these farms has already polluted the water environment heavily. This study investigated the purification of the swine wastewater from a pig farm in Inner Mongolia with combined process of low-intensity ultrasonic activation chamber enhanced biological A^2/ O reactor. A new technology was built in the advanced treatment of wastewaters from large-scale pig farms and the technological process and procedures were described as well. COD, BOD5, ammonia-nitrogen, and total phosphorus were detected through intermittent ultrasound and continuous ultrasound in the treated water through the whole process. Based on the experimental results, ultrasonic enhancement in batch mode worked with instability. The intensified effect was not stable in the whole process. However, when ultrasonic enhancement was applied in a continuous mode, removal rate of COD, BOD5, ammonia-nitrogen and total phosphorus in the effluent of swine wastewater was increased obviously and stably compared with that of the original biological A2/O reactor. Concentrations of COD, BOD5, ammonia-nitrogen and total phosphorus were reduced to 41-57, 3-8, 6-12 and 0.09-0.8 mg/L, respectively, which could fully meet the requirements of Grade B in GB18918-2002 Standard for Discharge of Pollutants from Sewage Treatment Works in Towns and Cities. In conclusion, the combination process of low-intensity ultrasonic enhanced biological A^2/O reactor showed outstanding and stable purification ability on the swine wastewater based on the bench-scale operation experiments on the pig farm. It has important significance to reduce the pollution caused by the swine wastewater and improve the natural water environment.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2015年第9期157-161,共5页
Environmental Science & Technology
基金
国家自然科学基金(51308537)
中央级公益性科研院所基本科研业务费专项
