外置式生物反应器对水库原水中总氮去除的试验  

Experiment of External Bioreactor for TN Removal in Raw Water of Reservoir

作　　者：毋海燕 Wu Haiyan(Tongji Environment Engineering Science and Technology Co.,Ltd.,Shanghai 200092,Chin)

机构地区：[1]上海同济环境工程科技有限公司,上海200092

出　　处：《净水技术》2018年第7期37-43,共7页Water Purification Technology

基　　金：上海市高新技术企业资助项目:舟山芦东水库原位脱氮工艺研发项目(TJHJ-2017-RD17)

摘　　要：利用外置式生物反应器系统对水库Ⅰ中水的原位总氮控制开展了试验研究。结果表明,在适宜的水温下,系统稳定运行20 d后,水库中TN浓度由起始的1.93 mg/L降至0.89 mg/L,TN去除率达53.9%,水质由地表Ⅴ类水标准迅速提升至Ⅲ类水标准,TN降解效果好,时间短。台风后,系统TN去除效果恶化的内外部主要原因调查分析表明,水库库底排水破坏了水库水体的自然分层,导致脱氮环境恶化,降雨地表径流对水库TN也有一定输入,同时底部排水带走了部分反硝化菌,且低温时水库中微生物活性有所降低。该水库属于单季完全或不完全混合型,水质完全混合期不利于TN的控制。底泥的扰动能够改善脱氮环境但对TN控制不利。实际运行中应尽量避免或调整以上不利因素以确保TN去除效果。In this study, a site test is carried out to investigate total nitrogen （TN） removal in situ by external bioreactor in the reservoir I ~ The results show that TN in the reservoir has been removed efficiently in warmer water after system＇ s stable operation of 20 d and its concentration reduces from 1.93 mg/L to 0.89 mg/L with a TN removal rate of 53.9%, water quality is improved and complies with category III of National Surface Water Quality Standards （ GB 3838-2002） compared with its raw water quality of category V. The primary cause of system deterioration after typhoon where TN removal efficiency decreased from internal and external origin is also explored and analyzed. The main results are that natural stratification of water quality in reservoir under different depth and water temperature is destroyed by human draining off water from the bottom of the reservoir,which leads to the deterioration of nitrogen removal condition. The surface runoff of rainfall has put a certain sum of TN to the reservoir. Meanwhile, some partial denitrification bacteria from reservoir sediment are carried out of the reservoir by drainage from the bottom of reservoir. In addition, the activity of biomass under lower water temperature decreases. The reservoir belongs to complete and incomplete mixing type in single season, and complete mixing of water in reservoir is unfavorable to the decrease of TN concentration. Finally, the influence of disturbance of sediment is not beneficial to control TN to a low level, but improves nitrogen removal environment. The above mentioned adverse factors ought to be avoided and adjusted to get better TN removal efficiency in the practical operation.

关 键 词：水库 外置式生物反应器 总氮去除 影响因素分析 

分 类 号：TU991[建筑科学—市政工程]