两性高分子絮凝剂的制备及其应用研究

以天然植物粉Ｆ６９１为原料,通过羧甲基化、接枝共聚和曼尼期(Ｍａｎｎｉｃｈ)三步反应合成出两性天然高分子改性絮凝剂(ＣＧＡＡＣ),确定了其较佳的制备条件;ＣＧＡＡＣ对造纸抄纸白水和造纸混合污泥的絮凝脱水试验表明:１０ｍｇ·ｌ－１ＣＧＡＡＣ与４０ｍｇ·ｌ－１ＰＡＣ配合使用,ＣＯＤＣｒ去除率可达７２%,效果优于对比样ＰＨＰ;ＣＧＡＡＣ对造纸混合污泥的絮凝脱水性能优于对比样ＰＨＰ和ＰＡＭ－Ｃ．     

搅拌萃取-红外分光光度法测定污水中石油类

以四氯化碳为萃取溶剂,自动搅拌萃取污水样品中的总油,有机相经硅酸镁吸附脱除极性物质后,选择红外分光光度法测定其中的石油类,方法检出限为0.024 mg/L;对实际水样进行4个质量浓度水平的加标回收试验,回收率在88.0%~108%之间,6次测定的相对标准偏差为2.9%~6.1%,满足污水中石油类的测试要求。     

集中式饮用水水源地水质预警指标体系构建

饮用水水源地水质预警是建立健全饮用水安全保障体系的关键环节,构建水源地水质预警指标体系是水源地监控预警工作的重要基础。系统分析了常规水质在线、生物毒性在线、卫星遥感、人工巡视等水质预警监测技术手段,并分析比较了各方法的优缺点。以此为基础,遵循水源地预警指标体系构建原则与实际需求,统筹兼顾,提出了建立以常规理化-生物毒性在线监测相结合,遥感监测与人工巡查相统筹的一体化水源地水质预警指标体系,为水源地水质预警监控工作提供合理的、科学的技术支撑。     

Nitrogen and phosphorus removal from domestic strength synthetic wastewater using an alternating pumped flow sequencing batch biofilm reactor

Nutrient removal from domestic strength synthetic wastewater by an alternating pumped flow sequencing batch biofilm reactor (APFSBBR) was investigated in this laboratory study. The APFSBBR comprised two reactor tanks (Reactors 1 and 2) with two identical biofilm modules of vertical tubular plastic media with a high specific surface area, one in each tank. The APFSBBR was operated in cycles of four phases: fill, anaerobic, aerobic, and draw. During the fill phase, Reactor 1 was half-filled with domestic strength synthetic wastewater. During the subsequent anaerobic phase, most of the phosphorus release took place from the submerged biofilm in this reactor. In the aerobic phase, the wastewater was circulated by pumps between Reactors 1 and 2, resulting in denitrification at the start of the aerobic phase due to low oxygen concentrations, followed by nitrification and luxury uptake of phosphorus when oxygen concentrations increased. During the draw phase, Reactor 2 was half-emptied of the treated water. At the chemical oxygen demand (COD), total nitrogen (TN), and total phosphorus (TP) loading rates on the total biofilm area of 3.20 g COD, 0.33 g TN, and 0.06 g TP m(-2) d(-1), the removal efficiencies were 97, 85, and 92% for COD, TN, and TP, respectively.     

废弃电路板中环氧树脂真空热解规律的研究

真空条件下,应用程序升温管式电炉对废弃电路板中环氧树脂热解规律进行了研究.考察了不同的热解终温(200～700 ℃)、升温速率(5～30 ℃/min)、真空度(以压力表征,3～30 kPa)及保温时间(10～150 min)对热解产物产率的影响.实验结果表明,热解终温是影响热解油产率最重要的因素;选择适当的热解终温(400～550 ℃)、升温速率(15～20 ℃/min)、真空度(15 kPa)及保温时间(30 min)有利于提高热解油产率.     

“十三五”时期哈尔滨空气质量变化特征及影响因素分析

对"十三五"期间哈尔滨市空气质量状况、变化特征及影响因素进行分析,为哈尔滨市打赢蓝天保卫战提供科学参考。以哈尔滨市为研究区域,基于哈尔滨市12个国控监测点位监测结果,对"十三五"期间哈尔滨市环境空气质量优良天数及6项污染物进行分析,总结了环境空气质量变化特征及影响因素。结果表明:"十三五"期间,哈尔滨市环境空气质量呈现波动向好趋势,较"十二五"期间大幅改善,除细颗粒物外,其他指标已稳定达二级标准,臭氧成为仅次于细颗粒物的首要污染物,冬季燃煤污染是环境空气最主要的污染来源,秋季秸秆焚烧及春季清除秸秆根茬也会产生一定影响。     

湖州合溪新港污染物入湖通量估算与分析

根据2021年5月—2022年4月合溪新港河流水量、水质(TN和TP)的同步监测数据,利用通量模型核算了合溪新港污染物(TN和TP)通量。通过测算合溪新港TN、TP通量与断面降雨强度、水质的响应关系,分析了该区域的污染类型及特点,为后期水质污染调查及通量研究提供了新思路。结果表明：合溪新港流量与降雨量存在明显相关关系,在强降雨期(7—8月)水体流量最高,占监测周期总流量的57.77%;少雨期则流量最低,且会出现湖水倒灌现象(11—12月)。通过分析合溪新港TN、TP通量与流量、水质的相关关系,确定了该流域污染类型为点源污染及农业面源污染共存的混合型污染,且在高强度降雨时污染物负荷量较大。综上,可针对农业面源污染对该流域治理提出相关对策,建立农业面源污染防治体系,以有效降低TN和TP污染物的入湖通量,减少太湖TN和TP污染物负荷量。     

Green energy mismatch,industrial intelligence and economics growth: theory and empirical evidence from China

Environment, Development and Sustainability - With the continuous uptick in world energy consumption, green energy plays an increasingly significant role in alleviating energy depletion and...     

A nationwide survey of 20 legacy brominated flame retardants in indoor dust from China: continuing occurrence,national distribution,and implication for human exposure

Environmental Science and Pollution Research - Despite the restrictions on polybrominated diphenyl ethers (PBDEs) and hexabromocyclododecanes (HBCDDs), these chemicals are still ubiquitous...     

Municipal waste treatment efficiency in 29 OECD countries using three-stage Bootstrap-DEA model

Environment, Development and Sustainability - Rapid urbanization has led to a sharp increase in municipal waste generation, which has resulted in significant environmental problems. However, the...