Fe(III)–EDDS complex in Fenton and photo-Fenton processes: from the radical formation to the degradation of a target compound

The present work compares the efficiency of homogenous Fenton and photo-Fenton processes in the presence of Fe(III)–EDDS complex under different experimental conditions. 4-tert-Butylphenol (4-t-BP), which is one of the endocrine disrupting chemicals, was used as a model pollutant to investigate the Fenton and photo-Fenton application. The efficiency of homogenous photo-Fenton process was significantly much higher than homogenous Fenton process, which is due to the rapid formation of Fe²⁺ under UV irradiation of the iron complex and the photochemical formation of HO^? from the photolysis of the complex Fe(III)–EDDS. Through the degradation of 4-t-BP, the effect of Fe(III)–EDDS concentration, H₂O₂ concentration, pH, and oxygen was investigated in both processes. Such trend was also correlated with pH calculating the polychromatic Fe²⁺ quantum yield formation at pH 4.0, 6.0, and 8.6. The results showed that at high Fe(III)–EDDS and H₂O₂ concentrations, a negative effect was found. By the way, the Fenton process was found to be enhanced at basic pH. These results can be very useful for the use and optimization of such iron complex in water treatment process as function of different physico-chemical conditions.     

反渗透处理稀土氨氮废水试验研究

根据稀土冶炼厂排放的碳铵沉淀洗涤废水的水质情况，采用NH4Cl和 NaCl模拟废水进行了反渗透可行性对比实验。模拟实验发现，在相同条件下反渗透对NaCl 较NH₄Cl 有着更高的去除率，而NH₄Cl 相对NaCl则有着更高的产水速率。实际废水试验结果表明，在恒定操作压力范围内回收率为65%的条件下，NH₄Cl浓度为2.85 g/L的碳铵沉淀洗涤废水经反渗透处理其NH₄Cl去除率为77.3%，可作为氨氮废水的预处理。对该废水处理成本进行了分析，得出其约为2.7元/m³，比相近浓度氨氮废水的氨吹脱处理成本节省约26%。     

好氧硝化颗粒污泥膜生物反应器性能和膜污染研究

实验研究了好氧硝化颗粒污泥膜生物反应器AGMBR的处理性能,并将其与活性污泥膜生物反应器ASMBR进行对比,考察了颗粒污泥在减缓膜污染中所起的作用.好氧硝化颗粒污泥膜生物反应器AGMBR连续稳定运行102 d,系统具有良好的去除有机物和同时硝化反硝化能力,在进水COD和NH+4-N浓度分别为500和200 mg/L时,COD、NH+4-N和TN的去除率分别稳定在86%、94%和45%以上.颗粒污泥有效减缓了膜污染,延长了膜清洗的周期,AGMBR中的膜污染以膜孔堵塞为主,占总阻力的64.81%;滤饼层的阻力为2.1×1012m-1,远小于ASMBR中的16.07×10"m-1;膜清洗周期是相同条件下ASMBR的2.43倍以上;而且AGMBR内不断有新颗粒生成,维持了AGMBR系统性能和运行的稳定.     

Impacts of land use change on ecosystem service value in Lijiang River Basin,China

Environmental Science and Pollution Research - It is of great significance for the coordinated development of the environment and the economy to study the impact of the human driving factors of...     

Transverse distribution of the streamwise velocity for the open-channel flow with floating vegetated islands

Environmental Science and Pollution Research - Floating vegetation islands (FVIs) have been widely utilized in various river ecological restoration projects due to their ability to purify...     

Occurrence,source apportionment,and carcinogenic risk assessment of polycyclic aromatic hydrocarbons in urban road dusts in Shanghai

Environmental Science and Pollution Research - Polycyclic aromatic hydrocarbons (PAHs), as a class of important environmental pollutants, have received considerable concern due to their widespread...     

Distribution characteristics of poly- and perfluoroalkyl substances in the Yangtze River Delta

In this work, a method was developed and optimized for the analysis of polyfluoroalkyl and/or perfluoroalkyl substances(PFASs) content in surface water and sediment samples with high instrumental response and good separation. Surface water and sediment samples were collected from the Yangtze River Delta(YRD) to analyze the distribution characteristics of perfluoroalkyl carboxylic acids(PFCAs), perfluoroalkane sulfonic acids(PFSAs), perfluoroalkyl phosphonic acids(PFPAs), perfluoroalkyl phosphinic acids(PFPiAs), and polyfluoroalkyl phosphoric acid diesters(di PAPs). The results showed that the total concentrations of PFCAs and PFSAs in YRD varied from 31 to 902 ng/L. PFCAs(≥ 11 carbons) and PFSAs(≥ 10 carbons atoms) were not detected in any surface water samples. The mean concentrations of all PFCAs and PFSAs in surface water from the sampling areas decreased in the following order:Yangtze river(191 ng/L) ≈ Taihu lake(189 ng/L) Huangpu river(122 ng/L) ≈ Qiantang river(120 ng/L) Jiaxing urban river(100 ng/L). Strong significant(p 0.05) correlations between the concentrations of many of the compounds were found in the sampling areas, suggesting a common source for these compounds. Only perfluorooctanoic acid(PFOA) was observed in all sediment samples, at concentrations varying from 0.02 to 1.35 ng/g. Finally, detection rates of two di PAPs were only 8% and 10%, respectively and the concentration of di PAPs was two to three times lower compared to PFCAs and PFSAs.     

玉门油田污染荒漠土壤石油降解菌多样性

为探索石油污染荒漠土壤石油降解微生物多样性、筛选高效石油降解菌,采用涂布平板法从石油污染荒漠土壤分离具有石油降解能力细菌,采用细菌形态观察和16S rRNA基因序列分析其多样性,并设计特异性引物,对分离细菌降解相关基因进行检测.结果表明,分离的37株细菌分别属于放线菌纲(Actinobacteria)、γ变形菌纲(Gammaproteobacteria)、β变形菌纲(Betaproteobacteria)、芽孢杆菌纲(Bacilli)和α变形菌纲(Alphaproteobacteria),分别占35.14%、32.43%、13.51%、13.51%、5.41%,归属于21个属的34个种类.优势菌属为假单胞菌属(Pseudomonas)、红球菌属(Rhodococcus)、微球菌属(Micrococcus)、寡养单胞菌属(Stenotrophomonas)、无色杆菌属(Achromobacter)和葡萄球菌属(Staphylococcus),占总数的51.35%,其中有36株细菌能以石油为唯一碳源稳定生长,对原油有明显的降解能力.在石油质量浓度为1 500 mg/L的基础培养基中,菌株YM43在培养7 d后对石油的降解率达55.47%,另有8株细菌的降解率不低于30.55%,11株细菌的降解率介于10.05%~28.37%,18株细菌的降解率不高于8.05%. PCR检测表明,有25株细菌含有烷烃单加氧酶基因,6株含芳烃双加氧酶基因,6株含联苯双加氧酶基因,4株含萘双加氧酶基因,3株含甲苯双加氧酶基因,2株含邻苯二酚双加氧酶基因.研究显示,石油污染荒漠土壤中可培养细菌具有高度多样性,分离的菌株有较强的石油降解能力,其降解功能与所存在的降解基因有关.      

烟草废弃物快速堆肥过程中重金属Cd形态变化特征

以烟草废弃物为原料,活性土壤为载体建立堆体,研究重金属镉的形态变化,及堆肥过程中的动态变化规律。结果表明,烟草废弃物与活性土壤混合能快速腐熟。堆肥总质量下降,重金属镉含量相对增加。重金属镉的铁锰氧化态比例增加19%,有机结合态比例在堆肥升温阶段增加,腐熟后有所下降。残渣态比例大幅度上升,增加达到5倍,且在腐熟阶段增幅最大。说明堆肥处理有利于降低重金属镉的活性。     

石墨烯复合材料在水处理中的应用研究

新型碳材料石墨烯,因其比表面积大,物理、化学特性优异,通常作为吸附剂或复合材料载体,用于难降解有机废水处理.载体石墨烯改性后,可优化复合材料性能,包括溶解性和可控性.基于复合材料制备,选取典型污染物废水,如染料废水、苯酚废水、农药废水,从吸附处理和催化降解两方面展开,简要介绍石墨烯复合材料的应用研究及作用效果,显示出复合材料可有效提高污染物降解效率,回用效果好.此外,石墨烯复合材料在回用及实际应用方面仍有待进一步研究.