Zhou Y.,Jiangsu Academy of Environmental Sciences |
Zhou Y.,Jiangsu Provincial Key Laboratory of Environmental Engineering |
Yan B.,Jiangsu Academy of Environmental Sciences |
Yan B.,Jiangsu Provincial Key Laboratory of Environmental Engineering |
And 6 more authors.
Advanced Materials Research | Year: 2014
Two weak acid resins (WT-1, WT-2) with different pore structures were prepared through suspension polymerization from methyl acrylate (MA) and divinylbenzene (DVB). Cu2+ was employed as the adsorbate and bath experiments were carried out to investigate the adsorption performance of the two resins. The addition of porogen (toluene) enlarged the exchange capacity, specific surface area and average pore diameter of resins, leading to the faster adsorption rate and higher maximum adsorption capacity. The adsorption capacity increased 3.5~28.5% with the rise of porogen/monomer ratio from 0 to 30%. This work shows the porogen influence on the adsorption kinetics and thermodynamics of weak acid resins. © (2014) Trans Tech Publications, Switzerland.
Zhang L.,Jiangsu Academy of Environmental Sciences |
Zhang L.,Jiangsu Provincial Key Laboratory of Environmental Engineering |
Tu Y.,Jiangsu Academy of Environmental Sciences |
Tu Y.,Jiangsu Provincial Key Laboratory of Environmental Engineering |
And 4 more authors.
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2014
The improved performance of A2/O (PACT) technology is characterized in comparison with conventional A2/O process in treatment of dyeing wastewater after hydrolysis acidification. The result shows that COD removal increased over 10% in A2/O (PACT) under a certain dosing quantity (100 mg · L-1) of powdered active carbon (PAC), while the experimental result demonstrates that treatment capacity of A2/O (PACT) could reach 0.6~1.0 kg · kg-1 PAC, and its operating efficiency and stability is greatly improved in winter. In addition, A2/O (PACT) process exhibits a higher removal efficiency in aromatic-, polycyclic-and heterocyclic-compounds characterized by GC-MS. The treatment performance for macro-molecular substance (e. g. dyestuff and humus with molecular weight of 800~1000 Da) is also improved by A2/O (PACT) detected by UV-VIS spectrometer and Gel permeation chromatography. Meanwhile, microscopic examination and electronic microscope photograph analysis show that A2/O (PACT) has a more complete biological biofacies, and the enhancement of PACT process could be attributed to the biological carrier role of the PAC.
Zhu Z.,Jiangsu Academy of Environmental Sciences |
Zhu Z.,Jiangsu Provincial Key Laboratory of Environmental Engineering |
Wang K.,Nanjing University |
Zhang B.,Nanjing University
Journal of Cleaner Production | Year: 2014
With the increasingly obvious constraint on resources and the environment that results from the growth of the population and the economy, promoting the eco-efficiency of products has become a critical component of achieving sustainable development. This research developed a network data envelopment analysis (DEA) combined with life-cycle environmental impacts of products for eco-efficiency evaluation. Taking pesticides as a case study, the eco-efficiencies of ten comparable pesticides were examined. The results show that Deltamethrin is the only eco-efficient pesticide and that Dichlorvos and Chlorpyrifos have lowest eco-efficiency scores. Pyrethroid pesticides are generally more eco-efficient than organophosphorus pesticides at the usage stage due to lower environmental impact. The results also find out that the network DEA method for evaluating eco-efficiency of products can distinguish differences in the eco-efficiency of products at the different stages which could provide a better discrimination among pesticides while compared to single-stage DEA model and present a relatively lower eco-efficiency score. Finally, since organophosphorus pesticides have a lower market price in China, new policies (such as subsidies or a pollution tax) should be designed to encourage the use of pyrethroid pesticides instead of organophosphorus pesticides. © 2014 Elsevier Ltd. All rights reserved.