Fe_(2)O_(3)-TiO_(2)/UV/O_(3)+PSAF协同处理猪场废水效果及其除碳脱氮机制  

Effects and mechanism of carbon and nitrogen removal of wastewater using Fe_(2)O_(3)-TiO_(2)/UV/O_(3)+PSAF treatment on a swine farm

作　　者：肖艳春[1,2] 陈彪 黄婧[1] 刘瑞来[3] Xiao Yanchun;Chen Biao;Huang Jing;Liu Ruilai(Institute of Agricultural Engineering Technology,Fujian Academy of Agricultural Science,Fuzhou 350003,China;Fujian Provincial Key Lab of Coastal Basin Environment,Fujian Polytechnic Normal University,Fuqing 350300,China;Fujian Provincial Key Laboratory of Eco-Industrial Green Technology,Wuyi University,Wuyishan 354300,China)

机构地区：[1]福建省农业科学院农业工程技术研究所,福州350003 [2]福建技术师范学院近海流域环境测控治理福建省高校重点实验室,福清350300 [3]武夷学院福建省生态产业绿色技术重点实验室,武夷山354300

出　　处：《农业工程学报》2021年第13期224-231,共8页Transactions of the Chinese Society of Agricultural Engineering

基　　金：福建省自然科学基金项目(2020J011374);福建省省属公益类科研专项(2018R1014-2,2020R1032002,2020R1032006);福建技术师范学院近海流域环境测控治理福建省高校重点实验室开放基金(S1-KF1903)

摘　　要：为实现低碳高氨氮猪场废水深度除碳脱氮,该研究提出了Fe_(2)O_(3)-TiO_(2)/UV/O_(3)+PSAF组合处理工艺技术。应用响应面法确立了组合工艺的最优工况条件,采用三维荧光和紫外-可见吸收光谱分析了有机物的荧光和分子结构变化特征,并结合碳、氮形态变化探明了其协同处理特性及除碳脱氮机制。结果表明,Fe_(2)O_(3)-TiO_(2)投加量为1.06 g/L、O3流量为3.02 g/h、曝气时间为90.75 min、聚硅酸铝铁(PSAF)用量为833.29 mg/L,COD及NH3-N去除效果最好,试验值与预测值偏差0.75%和0.56%,拟合性良好;组合工艺对猪场废水中的溶解性微生物代谢产物和类腐殖质处理效果显著,溶解性有机碳和总溶解性氮去除率分别达77.7%和82.6%,协同因子分别为1.11和1.50。其中,Fe_(2)O_(3)-TiO_(2)/UV/O_(3)对类腐殖质削减效果显著,O3和·OH协同氧化类腐殖质、NH3-N为小分子物质、NO_(3)^(-)-N和N_(2)(N_(2)转化率达39.71%),提高了富氧官能团的数量,促进了氮素的转化和矿化,利于PSAF对小分子物质和NO_(3)^(-)-N等污染物的去除,组合工艺协同互补作用明显。研究结果为深度处理低碳高氨氮有机废水提供一种新思路。Wastewater in livestock and poultry farming is the top priority to prevent and control the non-point source pollution in modern agriculture,due mainly to its high concentrations of nitrogen,suspended solids,and organic matter.In this research,a combined treatment was proposed to assemble Fe_(2)O_(3)-TiO_(2) photocatalytic ozonation and polyaluminum ferric silicate coagulant(Fe_(2)O_(3)-TiO_(2)/UV/O_(3)+PSAF),in order to achieve the deep decarbonization and denitrification of swine farm wastewater with low-carbon and high-ammonia-nitrogen(NH3-N)content.Response Surface Method(RSM)was employed to optimize the operating conditions of the combined process:the dosage of Fe_(2)O_(3)-TiO_(2) was 1.06g/L,the flow rate of O_(3) was 3.02g/h,the aeration time was 90.75 min,and the dosage of aluminum ferropolysilicate(PSAF)was 833.29 mg/L.The experimental value(COD:88.79%;NH_(3)-N:82.24%)and the model predicted value(COD:89.46%;NH_(3)-N:82.70%)were deviated by 0.75%and 0.56%,lower than 5%,indicating the excellent performance of the model.The interaction of composite factors demonstrated that the COD removal rate increased firstly,and then decreased with the increase of Fe_(2)O_(3)-TiO_(2) dosage,O_(3) flow rate and PSAF dosage,and finally peaked at the maximum in the range of 1.04-1.12g/L Fe2O3-TiO2 dosage,2.90-3.10 g/h O_(3) flow rate and 800-900 mg/L PSAF dosages.The NH3-N removal rate increased first and then decreased,with the increase of O_(3) flow rate and aeration time,and finally reached the maximum in the range of 2.90-3.10 g/h O_(3) flow rate and84-96 min aeration time.Furthermore,three-dimensional fluorescence spectroscopy(3 DEEMs)and ultraviolet-visible absorption difference spectroscopy(UV-Vis)were utilized to analyze the variation characteristics of fluorescence and molecular structures of Dissolved Organic Matter(DOM)in wastewater.The features and mechanism of carbon and nitrogen removal in the combined treatment were elucidated using the morphological changes of Dissolved Organic Carbon(DOC)and the Total Diss

关 键 词：废水 猪场 光催化臭氧氧化 混凝 3DEEMs UV-VIS DOC TDN DOM 

分 类 号：X713[环境科学与工程—环境工程]