某生活饮用地下水源处理工程设计方案

地下水具有水质较好、水温稳定、出水水质的特点,是生活饮用水的首选水源。同时,地下水易于对水源地进行卫生防护,防止可能对水源造成的污染。本项目是北方城镇生活供水工程,采用地下水源,水源水质含铁、锰较高,因此需经除铁、锰后达到生活饮用水标准再供居民饮用。     

地层除铁技术的新发展

近年来国外地层除铁技术,在除铁机理、设计原则和硝酸盐氧化还原法的应用方面,都取得了新的进展。 一、地层除铁机理 地下水中2价铁氧化为3价铁沉淀(氧化物或氢氧化物),氧化状态主要随水中溶解氧的数量而定。当雨水能很快渗入地下水中时,溶解的铁锰量即降     

乐山五通桥区引资项目

乐山五通桥区引资项目单位项目名称建设内容投资额（万元）合作方式乐山五星实业有限公司建添加剂预混料二期工程预混料５０００吨７７３合资乐山五星实业有限公司建父母代种鸡场１８０００套父母代种鸡３１８合资五通桥给排水设备厂扩大ＭＦＷ１－３００除铁除锰净水器生...     

上海市闵行区部分工业企业地下水中锰含量研究

指出了锰作为《地下水中质量标准》(GB/T 14848-2017)中的一般化学指标,其含量如果过高会为人体健康带来风险.基于此,探讨了上海市闵行区中地下水锰的背景值,并对比了闵行区部分工业企业地下水采样数据.结果表明:上海市地下水中锰属高背景值环境,但以化学原料和化学制品制造业为代表的工业企业生产仍会造成地下水中锰含量...     

用萃取——火焰原子吸收法测定树木叶片矿质元素

用盐酸对马尾松针叶和南方泡桐叶片进行预处理,以火焰原子吸收法对其矿质元素进行测定。结果表明,除铁元素外,钾、钠、钙、镁、锰、锌和铜均有较高的精密度和准确度。而且操作简便、快速,是测定林木叶样矿质元素的较好方法,可以在实际工作中加以推广应用。     

水源除锰机理探讨

以某公司水源为例,通过实验对北方地区地下水处锰机理进行了探讨。     

合作生产二氧化氯发生器

用二氧化氯替代氯系消毒剂在国内外已是发展趋势，二氧化氯无毒、无刺激、稳定、高效，杀菌能力是氯的５倍以上。用其消毒的水体不会对口腔粘膜、皮肤和头发产生损伤，不会引起染色体突变，安全性相当高。具有去色、除臭、除味、除铁和锰的功效，在生活饮用水、工业循环水处理、工业废水处理、纸浆漂白、印染漂白等方面应用广泛。二氧化氯最好是采用现场发生，所以二氧化氯发生器的市场前景很好。该设备采用的是化学法生成二氧化氯，与电解法发生器相比，具有结构简单、成本低、操作及维护方便、发生能力可在较大范围内调节等优点。产品规格…     

S市浅层地下水中重金属含量分布及健康风险评估

以S市为例分析了浅层地下水中11种重金属的含量分布,并进行健康风险评估,为该地区地下水重金属污染监管和治理提供参考。通过健康风险评价模型,分析了重金属的含量、空间分布、健康风险。研究区地下水中,11种重金属中有9种被检出,检出的重金属除个别点位铁锰含量较高以外,其他重金属含量为痕量水平。S市地下水重金属致癌风险在接受范围内,但应持续关注;地下水非致癌物危害指标均小于1,不会对人体健康造成显著毒性危害。     

广州临空经济示范区地下水环境探讨

基于广州临空经济示范区水文地质条件,就地下水开发利用现状、地下水污染源、主要环境水文地质问题等方面分析了广州临空经济示范区地下水环境现状。通过民井水样分析数据得出:区内主要环境水文地质问题表现为三种:区域性天然不良水质,主要表征为地下水质pH值偏高;由于农业用地或局部工程建设引起的地下水位下降;地下水铝、铅、锰含量偏高。     

锰矿渣金属浸出毒性及其改性对水中氟离子的吸附研究

应用固体废物浸出毒性的浸出方法（GB5086．2-1997）,对锰渣中金属的浸出特性进行了研究。实验结果表明：锰渣中重金属的浸出毒性虽未达到国家规定的危险废物鉴别标准,但是锰渣浸出液中锰的含量远超过了《污水综合排放标准》,大量堆积会对环境产生一定的影响。因此,开展了不同改性方法制备锰渣对水中氟离子的吸附作用研究,考察了搅拌时间、原水pH值、投加量等因素对锰渣除氟效果的影响,并运用I。angmuir和Freundlich吸附等温式对吸附等温数据进行了拟合,对可能的吸附机理进行了探讨,达到锰渣鹰物利用目的．     

地下水除铁

本文对如何除去地下水中2价铁、及井群布置进行了较详细的论述。     

浅谈小型火力发电厂输煤系统的粉尘治理

本文介绍了喷淋系统和DSX的防、除尘系统的降除尘原理以及在集中供热热源和热电联产的小型火力发电厂输煤系统中煤尘治理的应用方法.     

The utility of giant cane as a riparian buffer species in southern Illinois agricultural landscapes

Across the U.S., multiple species of riparian vegetation have proven to be effective filters of sediment and nutrients in agricultural watersheds. Research at Southern Illinois University Carbondale has focused on giant cane [Arundinaria gigantea (Walt.) Muhl.] as a potential candidate to incorporate into riparian buffer designs. In 2001, an exploratory study (i.e., Phase I) monitored nutrient and sediment concentrations from surface runoff and groundwater in the Cypress Creek watershed, while two subsequent studies (i.e., Phase II) focused on groundwater quality and added additional riparian buffer plots in the Big Creek and Cache River Watersheds. The primary objective of this research was to compare nutrient attenuation in groundwater of native giant cane and forest riparian buffers. Results from phase I showed significant nutrient reductions in groundwater over short distances in both the giant cane (~3.0 m) and forest buffers (~6.0 m), thus additional wells were installed at 1.5 and 12.0 m for the second phase. Groundwater NO₃ ⁻-N was significantly reduced by 90% in the initial 3.0 m of the giant cane buffer, where plant assimilation and microbial denitrification were likely key NO₃ ⁻-N removal mechanisms. Phase II showed significant reductions in groundwater NO₃ ⁻-N beneath the forest buffers, whereas little change occurred below the giant cane buffers. However, NO₃ ⁻-N concentrations beneath giant cane buffers were 3 times less than those observed beneath the forest buffers. Follow-up studies are being conducted on the transport of E. coli through vegetated buffers, and efforts have been expanded to the watershed-scale.     

碳氢氧稳定同位素在草地生态系统水循环研究中的应用

碳氢氧稳定同位素是存在于天然水体和植物组织中的良好的示踪剂,具有较高的灵敏度与准确性,可系统和定量地阐明草地生态系统水循环过程及各水体的转化关系、植物水分利用策略以及植被对全球变化的响应机制等。本文概述了稳定同位素的基本概念和原理,总结和分析了草地生态系统水循环的研究方法和现状,重点探讨和综述了氢氧稳定同位素技术在草地生态系统水循环过程（包括大气降水、地表水、土壤水、地下水、植物水、蒸发水等）以及碳稳定同位素技术在植物水分利用效率中应用的国内外研究进展,分析了其存在的问题,展望了这一领域未来的研究方向和应用前景,为我国草地资源保护、合理利用及退化草地生态系统恢复等提供理论依据。     

东北冰雪路面微波除冰技术探讨

介绍了微波加热原理及微波加热特性,进行了微波加热除冰实验.结果表明,微波除冰可以达到使路面与冰面分离的效果.     

干旱半干旱区人工林密度调控技术研究现状及趋势

水资源日趋紧张已是全球性生态问题.我国的干旱、半干旱、亚湿润干旱地区的面积分别为142.7、113.9、75.1万km2.其总面积为331.7万km2,占国土总面积的34.6%[1].这些地区降水量小,蒸发量大,植被稀少,生物量生产力低,属我国生态建设重点和难点地区.加强生态建设,恢复植被,需要实施大面积人工造林,提高经营管理技术,确保高的造林成活率和保存率.     

Ecophysiology of riparian cottonwoods: stream flow dependency, water relations and restoration

Cottonwoods (Populus spp.) are adapted to riparian or floodplain zones throughout the Northern Hemisphere; they are also used as parents for fast-growing hybrid poplars. We review recent ecophysiological studies of the native cottonwoods Populus angustifolia James, P. balsamifera L., P. deltoides Marsh., P. fremontii S. Watson and P. trichocarpa T. & G. in North America, and P. nigra L. in Europe. Variation exists within and across species and hybrids; however, all riparian cottonwoods are dependent on shallow alluvial groundwater that is linked to stream water, particularly in semi-arid regions. This conclusion is based on studies of their natural occurrence, decline following river damming and dewatering (water removal), water relations, isotopic composition of xylem water, and by the establishment of cottonwoods along formerly barren natural channels after flow augmentation in response to the conveyance of irrigation water. When alluvial groundwater is depleted as a result of river dewatering or groundwater pumping, riparian cottonwoods exhibit drought-stress responses including stomatal closure and reduced transpiration and photosynthesis, altered 13C composition, reduced predawn and midday water potentials, and xylem cavitation. These physiological responses are accompanied by morphological responses including reduced shoot growth, altered root growth, branch sacrifice and crown die-back. In severe cases, mortality occurs. For example, severe dewatering of channels of the braided Big Lost River in Idaho led to mortality of the narrowleaf cottonwood, P. angustifolia, and adjacent sandbar willows, Salix exigua Nutt., within 5 years, whereas riparian woodlands thrived along flowing channels nearby. The conservation and restoration of cottonwoods will rely on the provision of river flow regimes that satisfy these ecophysiological requirements for survival, growth and reproduction.     

铁屑内电解技术在抗生素废水预处理技术上的应用研究

分析了某药厂抗生素生产废水处理不达标的原因,应厂家要求对其废水处理站预处理设施进行了升级改造,经过现场试验决定在原有的混凝沉淀池前加铁屑内电解,使难生物降解具有毒性有机物分子结构发生改变,有效地提高了废水的B／C值,为后续的生化系统提供合适的营养基质,保证了COD最大限度的去除。     

木材的变色

本文论述了木材变色的特征及其防治措施 ,介绍了有代表性色调的变色特征、除色和防变色方法 ,同时探讨了已变色木材的普通除色方法、变色木材的利用以及药液处理时应注意的事项