Mn对超富集植物青葙Cd毒害的缓解效应

为了探究Cd胁迫下青葙中Mn的生理作用,通过水培实验,研究在Cd暴露下(0、5和25 μmol·L-1 )施加Mn(5、100和1 000 μmol·L-1 )对青葙的干重、叶绿素含量、Cd含量和青葙根部不同区域实时Cd2+流速的影响.结果表明,提高Mn的供应水平可缓解Cd对青葙生长的抑制效应.在Cd浓度为5 μmol...     

Coupled electrochemical methods for nitrogen and phosphorus recovery from wastewater: a review

Environmental Chemistry Letters - Declining mineral resources, high fertilizer production cost and widespread eutrophication are calling for the recovery of nitrogen and phosphorus from wastewaters...     

多级A/O工艺强化城市生活污水再生过程的污染物去除效果研究

北京市某城市污水厂在传统的A ²/O工艺基础上特别增设多级A/O(MAO)工艺强化脱氮除磷效果。以该污水厂各工艺单元出水为研究对象,通过对水质常规理化指标、紫外吸收光谱及其相关参数分析,并结合多元数据统计学手段,分析该工艺对城市污水中污染物的去除效果,特别是溶解性有机物(DOM)的去除。经MAO工艺强化后COD_Cr、DOC、TN、TP和N$H^{+}_{4}$-N的去除率分别为95.14%、89.70%、94.53%、97.26%和99.74%,达到GB 18918—2002《城镇污水处理厂污染物排放标准》一级A标准;增设MAO工艺后,提高了对DOM的去除率,DOM分子量和团聚化程度显著提高,化合物的稳定性增强。对污水再生过程处理单元水质化学指标与紫外光谱参数的相关性分析表明,芳香环上取代基类型以脂肪链为主时对脱氮除磷促进作用更加明显。     

焦化场地典型多环芳烃类污染物精细化风险评估

为准确评估多环芳烃(PAHs)污染土壤对人体的健康风险,解决目前基于总量风险评估导致土壤PAHs修复目标值过严的问题,采用德国标准研究院颁布的生物可给性测试方式研究了石家庄某焦化厂土壤中苯并[b]荧蒽(BBF)、苯并[k]荧蒽(BKF)、苯并[a]芘(BAP)、茚并[1,2,3-cd]芘(IPY)和二苯并[a,h]蒽(...     

阿特拉津在土壤中的生物降解研究

运用恒温培养法研究了阿特拉津在河北省白洋淀地区农田土壤中的生物降解动力学,并从中分离鉴定了土壤中降解阿特拉津的优势菌种,研究结果表明,该土壤对阿特拉津具有一定的降解能力,非生物＋生物的降解、非生物降解和生物降解的速率分别为０．０２６２ｄ＾－１,０．００５５４８ｄ＾－１和０．００８１９４ｄ＾－１,半衰期分别为２６ｄ,１２５ｄ和８５ｄ,发现土壤中降解阿特拉津的优势菌种为蜡状芽孢杆菌（Ｂａｃｉｌｌｕｓ     

Zinc tolerance and accumulation in Pteris vittata L. and its potential for phytoremediation of Zn- and As-contaminated soil

A field investigation and pot experiments were conducted to determine the potential of arsenic (As) hyperaccumulator, Pteris vittata L., to remediate sites co-contaminated with zinc (Zn) and As. We found that P. vittata L. had a very high tolerance to Zn and grew normally at sites with high Zn concentrations. In addition, P. vittata L. could effectively take up Zn into its fronds, with a maximum of 737 mg kg(-1) under field conditions. In pot experiments, the accumulated Zn concentration increased significantly as the Zn treatment was raised from 0 to 2000 mg kg(-1), with a maximum Zn accumulation of 0.22 mg pot(-1). Although the concentration of As in P. vittata L. was reduced by the addition of Zn, total frond accumulation of As was elevated when the Zn treatment was increased from 0 to 1000 mg kg(-1), with a maximum As accumulation of 8.3 mg pot(-1) in the presence of 1000 mg kg(-1) Zn. The high Zn tolerance, relatively high ability to accumulate Zn, and great capacity to accumulate As under conditions of suppression by high Zn suggest that P. vittata L. could be useful for the remediation of sites co-contaminated with Zn and As.     

秸秆成型燃料锅炉污染物排放规律试验研究

根据锅炉烟尘测试方法(GB 5468-91)及锅炉大气污染物排放标准(GB 13271-2001),在不同风门的工况下,分别对设计的双层炉排秸秆成型燃料锅炉污染物排放规律进行试验.试验表明,在较好工况下,双层炉排锅炉排烟中CO等中间产物及烟尘含量低于单层炉排锅炉,其排烟中CO、NOx、SO2和烟尘浓度等指标远远低于燃煤锅炉,符合国家关于工业锅炉大气污染物排放标准要求,有较好环保效益.     

Review of indoor emission source models. Part 1. Overview

Indoor emission source models are mainly used as a component in indoor air quality (IAQ) modeling, which, in turn, is part of exposure and risk modeling. They are also widely used to interpret the experimental data obtained from environmental chambers and buildings. This paper compiles 52 indoor emission source models found in the literature. Together, they represent the achievements that IAQ modelers have made in recent years. While most models have a certain degree of usefulness, genuine predictive models are still few, and there is undoubtedly much room for improvement. This review consists of two parts. Part 1--this paper-provides an overview of the 52 models, briefly discussing their validity, usefulness, limitations, and flaws (if any). Part 2 focuses on parameter estimation, a topic that is critically important to modelers but has not been systematically discussed.     

湖泊富营养化模型的研究进展

湖泊的富营养化是全球普遍关注的环境问题之一.湖泊的富营养化模型是防治、修复和治理湖泊富营养化的重要决策工具.按研究的侧重点不同,将湖泊富营养化模型分为简单回归模型、水质模型、生态模型和生态-水动力水质模型,并分别回顾了四类模型的研究进展.最后指出湖泊富营养化模型的发展趋势,强调不确定理论、3S技术、耦合模型是今后湖泊富营养化模型研究的重点,应在此基础上建立通用的模拟、预测、评价和优化模型,为湖泊富营养化管理提供科学依据.     

染整废水处理工程设计

采用“生物接触氧化 +混凝气浮 +生物炭”工艺处理染整废水 ,COD去除率可达到 90 %以上 ,工程实践表明 ,该工艺处理效果好 ,运行稳定 ,投资省 ,处理后出水可达标排放