摘要
将颗粒污泥引入结晶除磷过程,开发了羟基磷酸钙联合生物介质结晶除磷新工艺.运用自主设计的除磷反应器,考察了pH值、Ca/P、HRT对工艺性能的影响.试验结果显示,对含磷浓度为30mg/L的模拟废水,优化工艺参数为pH=12、Ca/P=3.34(摩尔比)、HRT=60min,除磷率为99.81%,出水磷浓度低至0.057mg/L.采用优化工艺参数,该工艺对猪场废水的除磷率为85.85%,出水磷浓度为4.67mg/L.磷元素在除磷产物中得到富集,尤其在反应器顶部、中部,除磷产物中磷含量达到37.68%和36.57%(以P2O5计),且主要以羟基磷酸钙形态存在,达到优质磷矿石标准,具有较高的回收价值.
Anaerobic granular sludge was introduced to phosphorus removal system, creating a new process for phosphorus removal with the combination of biological medium addition and calcium hydroxyphosphate crystallization. The effects of pH, Ca/P ratio, HRT on the performance of new process were investigated to optimize process parameters. The results demonstrated that the optimal parameters were pH = 12, Ca/P = 3.34(mole ratio), HRT = 60 min for synthetic wastewater with phosphorus concentration of 30 mg/L. Under the optimal condition, phosphorus removal efficiency was 99.81% and the effluent phosphorus concentration was 0.057 mg/L. The new process was operated for the phosphorus removal from piggery wastewater, which phosphorus removal efficiency was 85.85% and the effluent phosphorus concentration was 4.67 mg/L.The phosphorus was enriched in the product, especially in the top and central part of reactor. The phosphorus of product mainly existed in the form of hydroxyapatite and its content by P_2O_5 was 37. 68% and 36.57% respectively, which has reached the standard of high quality phosphate rock and has a high value for phosphorus reuse.
出处
《中国环境科学》
EI
CAS
CSSCI
CSCD
北大核心
2017年第11期4117-4124,共8页
China Environmental Science
基金
浙江省重点研发计划项目(2015C03013)
关键词
羟基磷酸钙
生物介质
结晶除磷
工艺优化
产物分析
Hydroxyapatite
biological medium
phosphorus removal with crystallization
process optimization
product analysis
