摘要
在11~14℃低温下,采用A^2/O-BAF系统处理低C/N生活污水,研究了污染物去除特性、反硝化除磷过程中除磷脱氮比例(ΔPO_4^(3-)/ΔNO_3^--N)以及BAF中曝气量和有效填料高度对硝化反应的影响.结果表明,在COD、NH_4^+-N、TN和PO_4^(3-)的平均进水浓度分别为193.1、58.6、60.3和5.1 mg·L^(-1)时,平均出水浓度分别为46.3、2.5、13.4和0.3 mg·L^(-1),达到国家城镇污水处理厂污染物排放标准一级A标准.对ΔPO_4^(3-)/ΔNO_3^--N进行线性拟合,比值分布在0.47~1.75之间;运用正态分布对ΔPO_4^(3-)/ΔNO_3^--N进行数理统计,其均值为1.20,标准差0.29.BAF中曝气量为60 L·h^(-1)和100 L·h^(-1),出水NH_4^+-N浓度小于5.0 mg·L^(-1)时所需填料高度分别为1.8 m和1.0 m;继续增大BAF中曝气量为120 L·h^(-1)时,气水流冲击导致生物膜脱落,造成出水NH_4^+-N大于5.0 mg·L^(-1).
Low C/N domestic sewage was treated by an A^2/O-biological aerated filter（ BAF） system at low temperatures（ 11-14℃）.The characteristics of pollutant removal,the ratio of denitrifying phosphorus to nitrogen（ ΔPO4^3-/ΔNO—3 N） and effects of aeration flow and effective packing height on nitrification in BAF were studied. The results showed that when the average influent concentrations of COD,NH4^＋-N,TN and PO4^3- were 193. 1,58. 6,60. 3 and 5. 1 mg·L^-1 respectively,their effluent concentrations were 46. 3,2. 5,13. 4 and 0. 3 mg·L^-1 respectively,which met the first level A criteria specified in the discharge standard of pollutants for municipal wastewater treatment plant（ GB 18918-2002）. The linear fitting of ΔPO4^3-/ΔNO3^--N was between 0. 47 and 1. 75. The normal distribution of mathematical statistics was applied-and the average standard deviation for ΔPO4^3-/ΔNO3^--N were 1. 20 and 0. 29 respectively. When the aeration flows were 60 L·h^-1 and 100 L·h^-1,the effluent concentration of NH4^＋-N was less than 5. 0 mg·L^-1,corresponding to the effective packing heights in the BAF of 1. 8 m and 1. 0 m respectively. However,when the aeration flow was increased to 120 L·h^-1,the air-water flow led to biofilm detachment,which caused the effluent concentration of NH4^＋-N to increase beyond 5. 0 mg·L^-1.
作者
黄剑明
赵智超
郑隆举
邵兆伟
安芳娇
陈永志
HUANG Jian-ming;ZHAO Zhi-chao;ZHENG Long-ju;SHAO Zhao-wei;AN Fang-jiao;CHEN Yong-zhi(School of Environmental and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;School of Bailie Mechanical Engineering,Lanzhou City University,Lanzhou 730070,China)
出处
《环境科学》
EI
CAS
CSCD
北大核心
2018年第10期4621-4627,共7页
Environmental Science
基金
国家自然科学基金项目(51668033)
甘肃省高等学校特色专业项目(101004)
