摘要
为了提高传统重油加工污水处理厂氮污染物的去除效率,实现碳、氮污染物的协同脱除,本文结合现场生化装置运行参数和前期研究成果,构建了两段进水A/O工艺中试实验装置和运行参数。侧线实验在一个重油加工污水处理厂开展,以水解酸化单元出水为处理对象。控制工艺条件:分段进水比例为7:3、外循环回流比1、溶解氧浓度(缺氧区0.1～0.4 mg/L,好氧区3.5～4.5 mg/L),重点考察第1段A/O内循环回流比R值、第2段A/O反硝化段外加碳源(葡萄糖)量对装置氮污染物去除效果的影响。研究结果表明,适当增加内循环回流比和碳源投加量,可以明显提高两段A/O工艺的总氮去除能力,并且不会降低有机污染物的去除效果。研究确定,最佳内循环回流比R值为0.5,碳源投加量为30 mg/L。在此条件下,总氮去除率可达84.7%,出水总氮质量浓度可以控制在10 mg/L以下,实现了重油加工污水深度脱氮。
In order to improve the removal efficiency of nitrogen pollutants in traditional heavy oil processing waste water treatment plants and achieve synergistic removal of carbon and nitrogen pollutants, based on the operation parameters of the biochemical device on site and the previous research results, a pilot test device and operation parameters in a two-step-feeding anoxic/oxic (A/O) process was constructed in this paper. The side-line experiment was carried out in a heavy oil processing wastewater treatment plant with the effluent of the hydrolysis acidification unit as the treatment target. Control process conditions, the ratio of step-feed influent water is 7:3, the reflux ratio of external circulation is 1, dissolved oxygen concentration (0.1~0.4 mg/L in the anoxic zone, 3.5~4.5 mg/L in the aerobic zone), pay more attention to the effects of the reflux ratio R of internal circulation of the first-stage A/O and the amount of additional carbon source (glucose) in the denitrification stage of the second-stage A/O on the removal efficiency of nitrogen pollutants. The results show that a proper increase of the reflux ratio in internal circulation and the carbon source addition can significantly improve the total nitrogen removal capacity of the twostep- feeding A/O process and will not reduce the removal efficiency of organic pollutants. The optimum reflux ratio R value of internal recycling is 0.5, and carbon source addition is 30 mg/L, under which the removal rate of total nitrogen can reach 84.7%, and the total nitrogen mass concentration of effluent can be controlled below 10 mg/L, thus realizing the deep denitrification of heavy oil processing wastewater.
作者
李长刚
阎光绪
郭绍辉
LI Changgang;YAN Guangxu;GUO Shaohui(College of Science, China University of Petroleum-Beijing, Beijing 102249, China; College of Chemical Engineering, China University of Petroleum-Beijing, Beijing 102249, China; Beijing Key Laboratory of oil & gas Pollution control, China University of Petroleum-Beijing, Beijing 102249, China)
出处
《石油科学通报》
2018年第4期475-482,共8页
Petroleum Science Bulletin
基金
国家自然科学基金联合基金(U1462201)资助
关键词
重油加工污水
两段A/O工艺
内循环回流比
碳源
脱氮
heavy oil processing wastewater
A/O process with two-step-feeding
internal recycle ratio
carbon source
nitrogenremoval
