生产固化剂A废水的COD_(Mn)与COD_(cr)相关性的探讨

分别用重铬酸钾法和高锰酸钾法测定了生产固化剂Ａ废水的化学需氧量ＣＯＤｃｒ和ＣＯＤＭｎ，得到了ＣＯＤｃｒ和ＣＯＤＭｎ的相关性方程，线性相关较好     

马铃薯淀粉废水的碱式聚合氧化铝处理

本文介绍了用碱式聚合氯化铝处理高浓度有机淀粉废水的效果。用实验室配制的CODw浓度为10000－15000mg/L的淀粉废水以不同用量的碱式聚合氯化铝为絮凝剂处理后，CODw去除率达到28％－47％，再经吸附柱吸附后，CODw去除率可达到65％。     

制糖工业废水CODcr和BOD_5相关性探讨

在制糖工业废水的监测中 ,CODcr和BOD5均与水体的有机物有密切联系 ,且它们之间还存在一定的比例关系。通过对多组数据的相关性分析 ,确定以甘蔗为原料的制糖废水 ,CODcr和BOD5之间存在一定的相关性 ,可以通过CODcr值估算BOD5的值     

人工湿地系统植物床内CODcr动态变化规律探讨

人工湿地处理污水系统植物床内各监测点的上、下层 Ｃ Ｏ Ｄｃｒ值虽有一定的差别,但经过成对平均数比较分析发现这种差别并未形成明显的趋势。污水在植物床基质中流动时,随着迁移距离的延长,其中的 Ｃ Ｏ Ｄｃｒ的降解速率呈现先快后慢的趋势,根据形成的动态变化曲线,建立了 Ｃ Ｏ Ｄｃｒ在植物床内沿程动态变化模型： Ｃ Ｌ＝ Ｃｏｅｘｐ（４６２９×１０－ ５ Ｌ２－ ００１５６７ Ｌ,０≤ Ｌ≤１００）。经验证,模型预测值与实际监测值呈非常显著相关（ｄｆ＝ ４,ｒ≥０９９４６＞ ｒ００００５（４）,ｒ００００５（４）＝ ０９７４１）。     

消除氯离子对CODcr快速仪法干扰的实验

氯离子浓度高于５００ｍｇ／Ｌ时,对ＣＯＤｃｒ的测定呈混浊干扰,通过加入ＨｇＳＯ４络合氯离子,可消除氯离子含量达２０００ｍｇ／Ｌ的干扰,过量的ＨｇＳＯ４对ＣＯＤｃｒ结果无影响。     

CODcr快速测试法的探索

本文探索了CODcr的快速测试法，结果表明，采用简易的火焰加热消化法测定CODcr是可行的。该法所用的仪器设备简单；操作方便，快速，回收率高，特别适用于现场及简易实验室。     

染色废水吸附混凝效应研究

用自制的酸性膨润土用无机混凝剂Ａｌ２（ＳＯ４）３联用处理含酸性红３Ｂ,弱酸橙ＧＳ和弱酸艳绿５Ｇ等染料的合成废水,以ＣＤＯＣＲ去除率和脱色率来表征吸附的处理效果,结果表明,酸性膨润土和酸性膨润土－硫酸铝两种吸收混凝剂的废水处理效果无明显差异,其效率与染料种类有关,处理含５Ｇ绿废水的效果优于含ＧＳ橙和３Ｂ红废水。     

复级电催化氧化处理乌洛托品废水的研究

采用复级电催化电氧化法处理含乌洛托品废水,研究了pH值、反应时间、电极间距离、极板电压等因素对乌洛托品废水去除效果的影响,确定了最佳的处理条件,结果表明：当进水pH值为5～6、反应时间120 m in、槽电压为15V、极板间距为5 cm时,COD去除率达80%以上,复级电催化氧化技术可用于处理乌洛托品废水,有效降低后续的生化处理负荷。     

Testing for thresholds of ecosystem collapse in seagrass meadows

Although the public desire for healthy environments is clear‐cut, the science and management of ecosystem health has not been as simple. Ecological systems can be dynamic and can shift abruptly from one ecosystem state to another. Such unpredictable shifts result when ecological thresholds are crossed; that is, small cumulative increases in an environmental stressor drive a much greater change than could be predicted from linear effects, suggesting an unforeseen tipping point is crossed. In coastal waters, broad‐scale seagrass loss often occurs as a sudden event associated with human‐driven nutrient enrichment (eutrophication). We tested whether the response of seagrass ecosystems to coastal nutrient enrichment is subject to a threshold effect. We exposed seagrass plots to different levels of nutrient enrichment (dissolved inorganic nitrogen) for 10 months and measured net production. Seagrass response exhibited a threshold pattern when nutrient enrichment exceeded moderate levels: there was an abrupt and large shift from positive to negative net leaf production (from approximately 0.04 leaf production to 0.02 leaf loss per day). Epiphyte load also increased as nutrient enrichment increased, which may have driven the shift in leaf production. Inadvertently crossing such thresholds, as can occur through ineffective management of land‐derived inputs such as wastewater and stormwater runoff along urbanized coasts, may account for the widely observed sudden loss of seagrass meadows. Identification of tipping points may improve not only adaptive‐management monitoring that seeks to avoid threshold effects, but also restoration approaches in systems that have crossed them.     

沸石对污水中BOD5和CODcr净化效果的研究

研究了天然沸石和活化沸石对污水中BOD_5和COD_(cr)净化效果的影响。结果表明,天然沸石对BOD_5的净化效果较好,而对COD_(cr)的效果较差,沸石适宜的用量和粒径为2.5g/L和80目。活化沸石对污水中的净化效果显著优于天然沸石,而且在处理24h后就能达到较好的净化效果。