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61.
利用电解方法处理核黄素上清液可使CODCr去除率达到 70 % ,SS去除率达到 83% ,色度去除率达到 6 5 % ,从而大大降低了后续综合处理负担 ,降低了总厂废水处理总投资和运行费用。 相似文献
62.
王冰 《环境污染治理技术与设备》2006,7(12):141-144,149
介绍了改进型气箱脉冲袋除尘器在铝电解烟气净化工程上的成功应用,实践结果表明,在保证净化效果的前提下,采用改进型气箱脉冲袋除尘器作为净化设备,可使其一次投资、能耗、年维修费与其他型式布袋除尘器相比均有所降低,为铝电解烟气净化工程扩大了除尘器的选择范围。 相似文献
63.
Pirkanniemi K Vuorio AM Vilhunen S Metsärinne S Sillanpää M 《Environmental science and pollution research international》2008,15(3):218-221
Goal, Scope and Background Complexing agents are one of the major environmental concerns in electrolytic and chemical surface treatment (ECST) industry;
e.g. the EU reference document on the best available technology (BREF) pays special attention to the usage of EDTA. However,
no comprehensive studies are available on usage of EDTA or other complexing agents or their load to the receiving waters from
ECST industry. In this study, the concentrations of complexing agents were analyzed to get an overview of their usage and
load and also to recognize their relevance in the environmental permitting and compliance monitoring of such facilities.
Methods Complexing agent concentrations of treated waste water samples of 23 ECST plants with vat volume exceeding 30 m3 was studied. HPLC and GC-MS were used to analyze and identify complexing agent concentrations, ICP-AES to analyze metals,
and TOC to analyse the organic load. The number of the plants in this study equals around 50% of such installations in Finland
subject to environmental permit as the IPPC directive provides.
Results EDTA, DTPA, and NTA were found in 11 samples out of 23 mainly in rather small concentrations. Their annual load to the receiving
waters may be estimated to be 0.3 tons and the total load from Finnish ECST industry can be extrapolated to be up to 1 ton.
Compared to the estimated use of 5–10 tons in the industry this finding is rather low, even though in Finland cast-off treatment
baths are typically delivered to the hazardous waste treatment plants.
Discussion Since the load of complexing agents is rather low, the chemical waste water treatment seems to be either capable of reducing
complexing agent concentrations to some extent or their usage is lower than expected. On the other hand, it is possible that
not all complexing agents were identified from the samples. The metal concentrations and TOC were well hand in hand with concentrations
found in the Finnish environmental database, which proves that the samples were of average quality of the waste water from
the facilities.
Conclusions According to the results, complexing agents cannot be considered as an environmental risk in the ECST industry in Finland;
EDTA concentrations are clearly below PNECaqua (2.2 mg/l) and the total discharge is very marginal compared to the discharge from the pulp and paper industry. However,
DPTA seems to be as commonly used as EDTA, but also biodegradable NTA was found.
Recommendations and Perspectives Since EDTA has gained plenty of attention in the BREF, DTPA and other, poorly biodegradable complexing agents should also
be taken into account when the BREF is updated within a few years. Also an EU risk assessment report especially for DTPA should
be supplied, since its use is obviously increasing. 相似文献
64.
通过对贵州省电解锰行业生产废水循环模式的调查,针对水质、水量特征进行改造:电解锰生产冷却循环水的强制排污水可降级作为电解产品和阴极板的冲洗水使用,处理后的含铬锰废水可作为制液氨水和电解清槽用水。进行以上优化后,电解锰生产废水闭路循环是可以实现的。 相似文献
65.
电解金属锰作为一种重要的冶金、化工原材料,为我国工业快速发展做出了较大贡献。但在锰资源的开采和加工过程中,存在着资源利用效率低下、生产集约程度不足、资源管理不善等多方面的问题,这不仅严重破坏了资源基础,更加重了环境恶化的趋势。我国的电解锰行业面对着资源短缺和环境保护的严峻挑战。为此,在系统分析我国电解锰行业面临的资源压力、环境压力、安全压力的基础上,探讨了我国电解锰行业可持续发展的途径和对策。重点强调国家应实行限产,适度开发,加大找矿工作力度,充分利用国内外两种资源;加快电解锰工业产业结构调整,通过并购、重组等措施发展壮大一批生产规模大、工艺先进、资源利用率高的企业;以资源和环境确定和优化经济增长模式,制定和完善电解锰行业发展政策,鼓励企业推行清洁生产。 相似文献
66.
氯酸盐生产中三废的综合利用 总被引:1,自引:0,他引:1
阐述了从氯酸盐生产电解尾气中回收氢、从含铬废水中回收重铬酸钠和用盐泥制内墙涂料等综合利用技术。 相似文献
67.
主要以某公司9000t/a碱锰型电解二氧化锰技改项目环境影响评价为例,结合验收监测数据,简要介绍碱锰型电解二氧化锰生产的环境影响与环保措施.该公司采用氧化锰矿和硫铁矿混合硫酸溶液浸出--电解的生产工艺生产碱锰型电解二氧化锰,生产过程中大气污染源主要有锅炉排放的烟气,化合、电解工序产生的硫酸雾;生产废水主要有锅炉除尘废水、漂洗水及炭黑生产废水;废渣主要是压滤锰渣. 相似文献
68.
69.
根据电解铝行业危险废物电解槽大修渣的特点,分析了电解槽大修渣的危害性,确定了电解槽大修渣为危险废物,并按照国家对危险废物填埋相关法律法规的要求和规定,从危险废物填埋场的入场、建设、监控、封场、污染控制等几个方面,对电解槽大修渣的安全填埋处置的环保要求进行了分析,最后对电解槽大修渣填埋的预处理、填埋作业、渗滤液处置等方面提出措施,并分析了措施的有效性,为电解铝行业电解槽大修渣填埋处置提供参考建议. 相似文献
70.