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排序方式: 共有177条查询结果,搜索用时 109 毫秒
51.
超稠油废水处理的实验研究 总被引:2,自引:0,他引:2
针对超稠油废水污染的问题 ,确定采用混凝沉降、砂滤、活性炭吸附处理超稠油废水 ,处理后的水达到国家排放标准。此方法工艺比较简单 ,处理效果好 相似文献
52.
Jana Naceradsk Katerina Novotn Lenka Cermakov Tomas Cajthaml Martin Pivokonsky 《环境科学学报(英文版)》2019,31(5):25-34
The removal of algal organic matter(AOM) is a growing concern for the water treatment industry worldwide. The current study investigates coagulation of non-proteinaceous AOM(AOM after protein separation), which has been minimally explored compared with proteinaceous fractions. Jar tests with either aluminum sulphate(alum) or polyaluminium chloride(PACl) were performed at doses of 0.2–3.0 mg Al per 1 mg of dissolved organic carbon in the p H range 3.0–10.5. Additionally, non-proteinaceous matter was characterized in terms of charge, molecular weight and carbohydrate content to assess the treatability of its different fractions. Results showed that only up to 25% of non-proteinaceous AOM can be removed by coagulation under optimized conditions. The optimal coagulation p H(6.6–8.0 for alum and 7.5–9.0 for PACl) and low surface charge of the removed fraction indicated that the prevailing coagulation mechanism was adsorption of non-proteinaceous matter onto aluminum hydroxide precipitates. The lowest residual Al concentrations were achieved in very narrow p H ranges, especially in the case of PACl. High-molecular weight saccharidelike organics were amenable to coagulation compared to low-molecular weight( 3 k Da)substances. Their high content in non-proteinaceous matter(about 67%) was the reason for its low removal. Comparison with our previous studies implies that proteinaceous and nonproteinaceous matter is coagulated under different conditions due to the employment of diverse coagulation mechanisms. The study suggests that further research should focus on the removal of low-molecular weight AOM, reluctant to coagulate, with other treatment processes to minimize its detrimental effect on water safety. 相似文献
53.
Ferrate(VI) salt is an oxidant and coagulant for water and wastewater treatment. It is considered as a possible alternative method in greywater treatment. However, challenges have existed in putting ferrate(VI) technology into full-scale practice in water and wastewater treatment due to the instability of ferrate solution and high production cost of solid ferrate products. This study demonstrated a new approach of greywater treatment with on-line batch production of Fe(VI) to which Fe(III) salt was oxidized at a weak acidity solution. A series of experiments were conducted to investigate the effect of Fe(VI) on light greywater (total organic carbon (TOC) = 19.5 mg/L) and dark greywater (TOC = 55 mg/L) treatment under different conditions with varying pH and Fe(VI) doses. In addition, the combination use of Fe(VI) and Al(III) salts was proved to be more efficient than using the Fe(VI) salts alone at greywater recycling. The optimum dosage of Fe(VI)/Al(III) salts was 25/25 mg/L for light greywater, 90/60 mg/L for dark greywater, respectively. The TOC values of both light greywater and dark greywater were reduced to less than 3 mg/L with the dosages. The cost for treating greywater was 0.06–0.2 $/ton at ferrate(VI) dosage of 25–90 mg/L and 0.008–0.024 $/ton at AlCl3 dosage of 25–60 mg/L. The full operating cost needs further assessment before the Fe(VI)/Al(III) technology could be implemented in greywater treatment. 相似文献
54.
化学除磷在中水回用工程中的运用和控制条件 总被引:2,自引:1,他引:1
以中水回用工程中总磷的去除为研究对象,考察了化学除磷方法中影响除磷效果的几个因素及其控制条件。结果表明,GT值对化学除磷的效果影响很大;在适当的混凝搅拌条件下聚合硫酸铁对总磷具有良好的去除效果,可使剩余总磷降到0.5 mg/L以下,满足中水回用水质标准。 相似文献
55.
56.
Xiaoman Liu Chang Tian Yanxia Zhao Weiying Xu Dehua Dong Kaimin Shih Tao Yan Wen Song 《Frontiers of Environmental Science & Engineering》2022,16(8):110
57.
高效物化法处理炼油废水 总被引:6,自引:0,他引:6
采用斜板式隔油沉淀与两级混凝气浮组成的工艺处理炼油废水。隔油池中设置斜板提高了油与悬浮物的去除率,同时也提高了油的回收量。循环式刮油刮泥机可及时刮除浮油与沉泥。混凝使胶粒与乳化油粒脱稳、聚集,易被气浮法去除。两级气浮串联使气浮系统的去除效率高并运行稳定。 相似文献
58.
高浓度洗煤废水治理方法的研究 总被引:2,自引:0,他引:2
分析了高浓度洗煤废水的性质及其难于处理的原因,提出了采用CaCl2+PAM混凝沉淀法处理该种废水的方法,并通过实验确定了主要技术参数.实验结果表明,该方法处理效果显著,不仅有较高的清水分离率,而且出水的各项指标均达到国家排放标准. 相似文献
59.
An investigation of dye decolorization from synthetic dye solutions using the non-ionic, water-soluble, high molecular weight seed gums Ipomoea dasysperma and guar gum as coagulants was undertaken. The use of galactomannans derived from plants in this system presents a sustainable method of textile effluent treatment. These natural coagulants extracted from plants proved to be workable alternatives to conventional coagulants like polyaluminum chloride, as they are biodegradable, safe to human health, are cost effective when compared to imported chemicals and have a wider effective dosage range for flocculation of various colloidal suspensions. Coagulant dose and coagulation pH are important factors influencing the mechanism of coagulation. Also the type and chemical structure of the dye plays an important role in the coagulation process. The seed gums alone were found to be effective for decolorization of direct dye and in combination with PAC their coagulation efficiency was well extended even for reactive and acid dyes. 相似文献
60.
城镇生活污水深度处理实验研究 总被引:2,自引:0,他引:2
采用SBR—化学混凝处理城镇生活污水,结果表明:经SBR处理后,废水中的COD、氮、磷得到很好的去除,最佳的混凝工艺条件为:废水pH7.30左右,聚合氯化铝钙用量20mg/L废水,搅拌强度120r/min,搅拌时间15min,加入PAM用量0.15mg/L废水。 相似文献