生态与农村环境学报2018，Vol.34Issue(3)：260-266,7.DOI:10.11934/j.issn.1673-4831.2018.03.010
堆肥物以及堆肥物与铁屑联用原位修复硝酸盐污染地下水研究
Studies on Compost and Compost+Iron Chip In?situ Bio-Remediating Nitrate-Contaminated Groundwater
摘要
Abstract
In order to solve the problem of nitrate contamination in groundwater, dynamic simulation column studies on compost and compost+iron chip promoting in-situ bio-remediation were carried out. The objectives were to investigate the operating performances,to explore the changes in hydrochemical parameters,to analyze the transformation processes of ni-trate,to identify the effects of groundwater velocity and influent nitrate concentration,to broaden the types of fiber-based solid organic carbon sources and to improve their denitrification rates. Results show that NO3-removal efficiencies of com-post and compost+iron chip were 75.08%-79.57% and 82.24%-86.48%,respectively. Using compost for in-situ biolog-ical denitrification is feasible and efficient,and compost+iron chip performs better for nitrate removal via hydrogenotrophic denitrification. At the beginning of operation(≤8 d), compost readily led to the effluent NO2- concentration above the Chinese drinking water standard(GB 5749-2006), and meanwhile compost+iron chip readily resulted in the effluent NH4+concentration above the Chinese drinking water standard(GB 5749-2006).Denitrification rates of compost and com-post+iron chip were 9.69 and 11.30 g·m-3·d-1, respectively, which were significantly higher than the value of saw dust(0.30 g·m-3·d-1).Total organic carbon(TOC)increment(≤18.34 mg·L-1)was kept stable during the period of 25-100 d for compost. During the period of 0-100 d for operation,effluent pH was always lower than the corresponding influent value for compost.The similar trends of TOC and pH were observed for compost+iron chip.After 10 d,most of the influent NO3--N was transformed into gaseous nitrogen in the presence of compost and compost+iron chip, respectively.Removal efficiency decreased from 76.84% to 48.32% for compost and from 85.22% to 55.98% for compost+iron chip with Darcy velocity increasing from 0.5 to 2.0 m·d-1. Removal efficiency decreased from 76.44% to 44.87% for compost and from 85.42% to 65.46% for compost+iron chip with influent NO3- concentration increasing from 100.58 to 301.02 mg·L-1. Darcy velocity and influent nitrate concentration both have significant effects in biological denitrification performance of compost and compost+iron chip,respectively.关键词
堆肥物/铁屑/地下水/原位生物修复/动态模拟Key words
compost/iron chip/groundwater/in-situ bio-remediation/dynamic simulation分类
资源环境引用本文复制引用
李爽,詹琪,任建新,马会强..堆肥物以及堆肥物与铁屑联用原位修复硝酸盐污染地下水研究[J].生态与农村环境学报,2018,34(3):260-266,7.基金项目
国家自然科学基金(41202170,41372236) （41202170,41372236）
辽宁省自然科学基金指导计划(201602469) （201602469）
辽宁省高等学校创新人才支持计划(LR2016059) （LR2016059）
辽宁省教育厅基本科研项目(L2017LQN001) （L2017LQN001）
