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Engineering, Taiwan

Cheng W.-H.,Fooyin UniversityKaohsiung | Fang Y.-C.,Formosa Petrochemical
Sustainable Environment Research | Year: 2012

This study assessed the air exhaustion control of corrugated plate interceptor (CPI) oil separators in a refinery wastewater treatment plant for biodegradation of volatile organic compounds (VOCs) by deep activated sludge aeration systems. Three approaches were used to derive VOC emission factors: (a) Calculating using the aeration rate and VOC gas-liquid equilibrium concentration (Cg *), (b) Simulation using the Water 9 model, and (c) VOC mass balance calculation. Based on field sampling and laboratory analysis, lipophilic alkanes (900-1,200 ppm as total hydrocarbons (THCs)) were removed by the activated sludge system and only 0.40-0.60 ppm THC VOCs were emitted, and VOC emission factors were 0.055-0.548 g m-3 wastewater using the different calculation approaches. We recommended using the Cg * and installed air aeration rates as more effective accurate method for simulating VOC emissions rates than examining individual aqueous VOC concentrations for Water 9 model simulation. In comparing with the capital costs of reconstructing pipelines from CPI oil separators to the activated sludge system as well as those of sampling and analysis, to pay legal VOC taxes, the former demonstrates its economic efficacy of reducing the amount of VOC exhausts. © 2012, Chinese Institute of Environmental Engineering. All rights reserved.


Chen J.-C.,Fooyin UniversityKaohsiung | Ning S.-K.,National Taiwan University | Chen Y.-L.,Fooyin UniversityKaohsiung
Sustainable Environment Research | Year: 2011

In order to mitigate the emission of green house gas, using renewable energy is more and more prevalent worldwide. As a member of top-ten countries exporting pork, Taiwan definitely has a high potential to develop renewable energy from swine waste. Since 1980s, Taiwan government had encouraged farmers to use biogas for warming piggy. But this policy turned out to be a failure because of low incentive to most swine farmers. Both investors and regional authorities require a decision support to evaluate whether swine manure is worthy of being utilized as biomass energy. This paper proposed two-stage mixed integer optimization (TSMIO) method to make an optimal hauling plan for each designated area. Mixed routing ways composed of express way and circuit way efficiently gathering swine manure together. Two cheap tools: Super LINGO and EeePC, easily and fast fulfill the above optimal hauling plan. By incorporating the profit of carbon trading and the expense of purchasing manure into the optimization analysis, this paper carries out a three-win of the investor, the farmer, and the environmental authority. So developing biomass energy with environmental sound style is achievable via TSMIO method. In addition to the environmental benefit, a potential profit of 2,870 million NTD (USD = 32 NTD) during 8 yr investment in the study area would be very attractive to the investors. Moreover this paper offers regional authority a diagnosis about the necessity of developing swine-farming industry in their governing area. © 2011, Chinese Institute of Environmental Engineering. All rights reserved.


Lai C.-H.,Fooyin UniversityKaohsiung | Yeh S.-H.,Fooyin UniversityKaohsiung | Chen M.-J.,Fooyin UniversityKaohsiung | Wang M.-S.,Bureau of Environmental Protection | Huang L.-J.,Fooyin UniversityKaohsiung
Sustainable Environment Research | Year: 2010

A heating process for coating crystalline iron oxide on the sand surface was employed to synthesize the iron-coated medium. Iron-coated medium was then utilized to investigate the removal efficiency and mechanisms for lead ions in the presence of humic acid in batch and continuous column tests under various solution pHs. The results indicated iron-coated medium was effective for removing lead solution containing humic acid. The solution pH was found to have a noticeable effect on lead removal. Lead and humic acid would form the insoluble compounds at pH 5.5 to 6.5. Control of solution pH was important, and the following two removal mechanisms of lead were proposed: (1) adsorption of soluble humic acid/lead by surface sites of iron-coated medium, and (2) formation of insoluble lead and humic acid compound. © 2010, Chinese Institute of Environmental Engineering. All rights reserved.


Lai C.-H.,Fooyin UniversityKaohsiung | Yeh S.-H.,Fooyin UniversityKaohsiung | Chen M.-J.,Fooyin UniversityKaohsiung | Huang H.-C.,Fooyin UniversityKaohsiung | And 2 more authors.
Sustainable Environment Research | Year: 2012

Iron oxide-coated sand (IOCS) was used as an adsorbent for removing As(V) from water in which the adsorption capabilities of IOCS for As(V) were examined under different environmental conditions. A synthetic water sample was used to study the impact of humic acid (HA) on the adsorption capabilities of IOCS for As(V). Results showed that the adsorptive characteristics of IOCS on As(V) fairly obey the pseudo-second order kinetic adsorption behavior. In addition, the adsorption mechanisms of IOCS for As(V) appeared to be governed by the physical and chemical adsorption. HA plays an essential role in competitive adsorption with As(V) on IOCS surface. The adsorption capacities of IOCS for As(V) under different environmental conditions are ranked in terms of magnitude as follows: single As(V) adsorption system > As(V)/HA + IOCS adsorption system > HA/IOCS + As(V) adsorption system. Langmuir adsorption isotherm regression results show that at 25 °C and pH = 3.0, the maximum adsorption capacities of IOCS for As(V), As(V)/HA + IOCS and HA/IOCS + As(V) are 1,667, 1,000 and 714 µg As g-1 IOCS, respectively. © 2012, Chinese Institute of Environmental Engineering. All rights reserved.

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