废铁屑协同曝气去除污水硫化物效能及机制  

Efficacy of sewage sulfide removal by co-aeration of scrap iron filings

作　　者：赵航 张志强 金峰 卢金锁 ZHAO Hang;ZHANG Zhi-qiang;JIN Feng;LU Jin-suo(Shaanxi Key Laboratory of Environmental Engineering,School of Environmental and Municipal Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;State Key Laboratory of Green Building in West China,Xi’an University of Architecture and Technology,Xi’an 710055,China)

机构地区：[1]西安建筑科技大学环境与市政工程学院,陕西省环境工程重点实验室,陕西西安710055 [2]西安建筑科技大学,西部绿色建筑国家重点实验室,陕西西安710055

出　　处：《中国环境科学》2024年第11期6148-6155,共8页China Environmental Science

基　　金：国家自然科学基金资助项目(52370100)。

摘　　要：通过向污水中投加工业废铁屑,协同曝气技术构建了铁-氧-硫化物控制体系.利用废铁屑强化氧气对于硫化物的氧化过程,以改善传统曝气充氧控制水相中硫化物低效的问题.本文搭建了模拟污水管道反应器,通过调控废铁屑投加量和污水pH值,评估了废铁屑与溶解氧构成的铁-氧体系对于硫化物的控制效果.将铁-氧体系与Fe^(2+)、Fe^(3+)直接催化氧气氧化过程进行了对比,通过总硫化物浓度一阶速率方程探究了其硫化物控制机制,并在连续流反应器中验证了铁-氧体系对于硫化物长期控制的有效性.结果表明,铁屑投加量在40g/L以上时,污水中硫化物可在10min内被近乎100%去除,并且污水pH值的提高有利于硫化物的去除.在为期30d的连续流试验中,在气水比(2+1.25)%铁屑的工况下,反应器中的硫化物浓度低于检测限,并且反应器气相空间中的H_(2)S平均浓度维持在20.5×10^(-6).The iron-oxygen-sulfide control system was constructed by the synergistic aeration technology through the processing of industrial scrap irons into the wastewater.The scrap irons were used to enhance the oxidation process of sulfide by oxygen to improve the inefficiency of traditional aeration and oxygenation to control sulfide in the water phase.A simulated wastewater pipeline reactor was constructed,and the iron-oxygen system composed of scrap iron filings and dissolved oxygen was evaluated for the control of sulfide by regulating the amount of scrap iron filings and the pH value of wastewater.The iron-oxygen system was compared with the direct catalytic oxygen oxidation process of Fe^(2+)and Fe^(3+),and its sulfide control mechanism was explored by the first-order rate equation of total sulfide concentration,and the effectiveness of the iron-oxygen system for the long-term control of sulfide was verified in a continuous flow reactor.The results showed that the sulfide in the wastewater could be removed nearly 100%within 10min when the dosage of scrap iron filings was above 40g/L,and the increase in pH of the wastewater was favorable to the removal of sulfide.In a 30 day continuous flow test,the sulfide concentration was below the detection limit at a gas-to-water ratio of(^(2+)1.25)%iron filings,and the average H_(2)S concentration in the gas-phase space of the reactor was maintained at 20.5×10^(-6).

关 键 词：污水管道 废铁屑 曝气 硫化氢 以废治废 

分 类 号：X703.5[环境科学与工程—环境工程]