摘要
文章采用“石灰预处理+两级AO+膜生物反应器”工艺处理填埋污泥脱水液,原位考察了溶解氧和外部碳源种类对填埋污泥脱水液脱氮效果的影响。工艺稳定运行期间,出水NH4_(+)^(-)N浓度为(52.11±8.60)mg/L(以N为计,下同),出水NO_(2)^(-)-N浓度为(28.23±5.09)mg/L,出水NO_(3)^(-)-N浓度为(25.57±4.43)mg/L,氮去除率为88.10%±1.20%,氮去除负荷为0.02 kg/(kg VSS·d)。低溶解氧浓度(1~1.5 mg/L)相比高溶解氧浓度(2~3 mg/L)更易实现短程硝化,增强短程硝化-反硝化脱氮途径,但是低溶解氧浓度以及降低曝气量造成的搅拌强度降低会导致生化反应速率降低。使用垃圾渗沥液和乙酸钠混合的外部碳源相比单一的乙酸钠溶液作碳源可提高反硝化效果,氮去除率由83.18%±1.26%上升至88.10%±1.20%,同时实现了垃圾渗沥液资源化利用,降低填埋污泥脱水液处理的药剂投加成本。
The“pretreatment+two-stage AO+membrane bioreactor”process was used to treat landfill sludge dewatering fluid.The influence of dissolved oxygen and external carbon source types on the nitrogen removal performance was investigated in situ.During stable operation,the effluent NH_(4)^(+)-N concentration was(52.11±8.60)mg/L,the effluent NO_(2)^(-)-N concentration was(28.23±5.09)mg/L,the effluent NO_(3)^(-)-N concentration was(25.57±4.43)mg/L,the nitrogen removal efficiency was 88.10%±1.20%,and the nitrogen removal load was 0.02 kg/(kg VSS·d).Low dissolved oxygen concentration(1~1.5 mg/L)is more conducive to partial nitrification compared to high dissolved oxygen concentration(2~3 mg/L),enhancing the partial nitrification-denitrification nitrogen removal pathway.However,low dissolved oxygen concentration and reduced stirring intensity caused by reducing aeration intensity will lead to a decrease in biochemical reaction rates.Comparing to use acetate as a carbon source,using a composite carbon source of leachate and acetate can improve denitrification efficiency,with the nitrogen removal efficiency increasing from 83.18%±1.26%to 88.10%±1.20%,and reduce the cost of agents for treating landfill sludge dewatering fluid.
作者
龚晓露
王俊杰
GONG Xiaolu;WANG Junjie(Shanghai Municipal Engineering Design Institute(Group)Co.,Ltd.,Shanghai 200092,China)
出处
《环境科学与技术》
CSCD
北大核心
2024年第S2期147-151,共5页
Environmental Science & Technology
基金
上海市“科技创新行动计划”国际科技合作项目(22230730300)
关键词
填埋污泥脱水液
脱氮
溶解氧
碳源
污水资源化
landfill sludge dewatering fluid
nitrogen removal
dissolved oxygen
carbon source
wastewater utilization
