Utilization of pulp and paper industrial wastes to remove heavy metals from metal finishing wastewater

Sthiannopkao, Suthipong,Sreesai, Siranee Elsevier 2009 Journal of environmental management Vol.90 No.11

<P><B>Abstract</B></P><P>Two pulp and paper industrial wastes, lime mud (LM) and recovery boiler ash (RB), have low moisture contents, low heavy metal contaminations and contain various carbonate compounds which contribute to a high pH. Metal finishing wastewater (MF-WW) has a low pH, high levels of TDS and high contaminations from Cr, Cu, Pb and Zn. The heavy metals from MF-WW were removed by sorption and precipitation mechanisms. LM gave better results in removing heavy metals from MF-WW than RB. At a reaction time of 45min, the maximum removal efficiencies for Cr (93%) and Cu (99%) were obtained at 110gL<SUP>−1</SUP> of LM, but at 80gL<SUP>−1</SUP> for Pb (96%) and Zn (99%). Treatment with LM gives a higher sludge volume than with RB. However, the leachability of heavy metals from LM is lower. Leachability of heavy metals in the sediment for all selected treatment conditions is within government standards.</P>

Effects of soil erosion on water quality and water uses in the upper Phong watershed

Sthiannopkao, S.,Takizawa, S.,Wirojanagud, W. IWA Publishing 2006 Water Science & Technology Vol.53 No.2

<P>The main objective of this paper is to simulate the effects of soil erosion on river water quality and on agricultural production as a result of the transformation of forestlands in the catchment of the upstream Phong River. Suspended solids carry down attached nutrients and agricultural chemicals causing water pollution in the downstream. There are four different types of land use in this simulation, namely forestlands, flatland and highland sugarcane plantation areas, and paddy fields. The highest mean annual amount of soil erosion is from paddy fields (585,700 tons/year), followed by highland (73,800 tons/year) and flatland (63,950 tons/year) sugarcane plantation areas and forestlands (41,800 tons/year), respectively. However, as most of paddy fields are located in a low land and are wet type cultivations, the soil erosion occurred has less impact on river water quality and its production compared to the soil erosion from the steeper slopes of highland plantation areas. Under the resource-based agriculture, the sugarcane production is mainly increased by expanding the plantation areas leading to a significant loss of topsoil and a considerable reduction of agricultural production. Soil erosion contributes to an increase in the average annual suspended solids concentration by 72 mg/l.</P>

Synthesis and characterization of Fe-MCM-41 from rice husk silica by hydrothermal technique for arsenate adsorption

Wantala, Kitirote,Sthiannopkao, Suthipong,Srinameb, Bang-orn,Grisdanurak, Nurak,Kim, Kyoung Woong Springer-Verlag 2010 Environmental geochemistry and health Vol.32 No.4

Assessment of metal and bacterial contamination in cultivated fish and impact on human health for residents living in the Mekong Delta

Chanpiwat, P.,Sthiannopkao, S.,Widmer, K.,Himeno, S.,Miyataka, H.,Vu, N.U.,Tran, V.V.,Pham, T.T.N. Pergamon Press 2016 CHEMOSPHERE - Vol.163 No.-

Fish is the main source of animal protein and micronutrients for inhabitants in the lower Mekong River basin. Consumption of fish in the basin ranges from 41 to 51 kg capita<SUP>-1</SUP> year<SUP>-1</SUP>. Thus, concerns of human health impacts caused by daily intake of metals contained in fish, and the incidence of bacterial contamination from Listeria and Escherichia coli have been raised. This study was conducted to 1) determine concentrations of metals, fecal indicator organisms, and Listeria spp. in cultivated common diet fish, and 2) assess human health risks as results of fish consumption on a daily basis. The results showed significant impacts of metal accumulation in fish especially from the intensive aquaculture. Chemical use to promote the rapid allometric growth of fish was expected to be the explanation for this finding. Concentrations of metals contained in different fish species were not statistically different with the exceptions of Na, Mn, and Zn. This might be due to the mobility of elements in aquaculture farms. Listeria and E. coli log CFU/g were 1.36 +/- 0.11 (standard error) and 1.57 +/- 0.1 s.e., respectively with higher counts observed in samples collected in market sites. Lastly, for human health risk assessment via fish consumption, it was found that hazard quotients of consuming As, Cu, and Zn contained in all fish species could contribute adverse health effects to the local residents (hazard quotients higher than 1). Therefore, risk management measures must be promoted and implemented in all study areas to reduce potential risks to local Vietnamese residents.

Utilization of zeolite industrial wastewater for removal of copper and zinc from copper-brass pipe industrial wastewaterA paper submitted to the Journal of Environmental Engineering and Science.

Sreesai, Siranee,Sthiannopkao, Suthipong Canadian Science Publishing 2009 Canadian journal of civil engineering Vol.36 No.4

<P> Utilization of zeolite industrial wastewater as a sorbent and (or) precipitant to remove Cu and Zn from copper-brass pipe industrial wastewater was conducted. These wastewaters were sampled and values for pH, temperature, biochemical oxygen demand (BOD5), chemical oxygen demand (COD), total solids (TS), total dissolved solids (TDS), total suspended solids (TSS), and heavy metals were determined. In addition, the sorption isotherms of Cu and Zn in copper-brass pipe industrial wastewater onto solids of zeolite industrial wastewater at various dilutions of copper-brass pipe industrial wastewater were explored. The relationship between Cu and Zn concentrations and their removal efficiencies under different conditions of wastewater pH, contact times, and ratios between copper-brass pipe industrial wastewater and zeolite industrial wastewater was examined. Zeolite industrial wastewater contained various carbonate compounds that contributed to high pH and TDS values, and low heavy metals contamination whereas copper-brass pipe industrial wastewater had a low pH value and was contaminated with heavy metals, especially Cu and Zn. Application of zeolite industrial wastewater significantly increased the pH of copper-brass pipe industrial wastewater and consequently removed Cu and Zn. The increase in pH of the wastewater mixture significantly enhanced the heavy metals removal. The Langmuir equation described sorption isotherms of Cu and Zn onto solids of zeolite industrial wastewater at neutral pH (6-7) while the Freundlich equation fitted well at pH @@>@@ 12. The maximum Cu (97%-98%) and Zn (92%-96%) removal efficiencies occurred at the original pH 12.8 of zeolite industrial wastewater, at the ratio of copper-brass pipe industrial wastewater to zeolite industrial wastewater 3:1 (vol.:vol.) and at 30 min contact time. </P>

Anthropogenic influence on surface water quality of the Nhue and Day sub-river systems in Vietnam

Hanh, Pham Thi Minh,Sthiannopkao, Suthipong,Kim, Kyoung-Woong,Ba, Dang The,Hung, Nguyen Quang Springer-Verlag 2010 Environmental geochemistry and health Vol.32 No.3

Mae Moh Lignite Mine and Environmental Management

Chanin Teparut,Suthipong Sthiannopkao 한국자원공학회 2011 Geosystem engineering Vol.14 No.2

Mae Moh Lignite Mine, in northern Thailand, is the largest open-pit lignite mine in Southeast Asia. It is designed to produce some 16 million tons of lignite per year, to meet the 2400 MW requirements of Mae Moh’s mine-mouth thermal power plants. The mine operation causes both direct and indirect environmental impacts on land use, quality of life,forests and wildlife; it has also caused pollution in such forms as dust, noise, water contamination, odors from the spontaneous combustion of lignite and vibration from blasting. Recognized as a significant pollution source, regulations based on environmental impact assessments (EIA) have been stringently applied. The mine’s controlling body has undertaken responsibility for management of all impacts through its Mae Moh Mine Master Plan, an ambitious outline for further development of the lignite resources in Mae Moh Basin. Standard management by ISO 14001, ISO9001, TIS18001 and CSR guidelines is at present under implementation. The transparency of the system has served to increase trust in Mae Moh Mine’s environmental management, while contributing to an awareness of the environmental impacts and the continual efforts to mitigate them.

Development of Water Quality Indexes to Identify Pollutants in Vietnam’s Surface Water

Thi Minh Hanh, Pham,Sthiannopkao, Suthipong,The Ba, Dang,Kim, Kyoung-Woong American Society of Civil Engineers 2011 Journal of environmental engineering Vol.137 No.4

Dietary exposure and human risk assessment of phthalate esters based on total diet study in Cambodia

Cheng, Zhang,Li, Han-Han,Wang, Hong-sheng,Zhu, Xue-Mei,Sthiannopkao, Suthipong,Kim, Kyoung-Woong,Yasin, Mohamed Salleh Mohamed,Hashim, Jamal Hisham,Wong, Ming-Hung Elsevier 2016 Environmental research Vol.150 No.-

<P><B>Abstract</B></P> <P>Phthalate esters are used in a wide variety of consumer products, and human exposure to this class of compounds is widespread. Nevertheless, studies on dietary exposure of human to phthalates are limited. In this study, to assess the daily intakes of phthalate esters and the possible adverse health impacts, different food samples were collected from three areas of Cambodia, one of the poorest countries in the world. The ∑phthalate ester concentrations in Kampong Cham, Kratie and Kandal provinces ranged from 0.05 to 2.34 (median 0.88) μgg<SUP>−1</SUP>, 0.19–1.65 (median 0.86) μgg<SUP>−1</SUP> and 0.24–3.05 (median 0.59) μgg<SUP>−1</SUP> wet weight (ww), respectively. Di-2-Ethylhexyl phthalate (DEHP) and diisobutyl phthalate (DiBP) were the predominant compounds among all foodstuffs. The estimated daily intake (EDI) of phthalate esters for the general population in Kampong Cham, Kratie and Kandal was 34.3, 35.6 and 35.8μgkg<SUP>−1</SUP> bw d<SUP>−1</SUP>, respectively. The dietary daily intake of DEHP, benzylbutyl phthalate (BBP) and di-n-butyl phthalate (DBP) in Kampong Cham, Kratie and Kandal were below the tolerable daily intakes (TDI) imposed by the European Food Safety Authority (EFSA) and reference doses (RfD) imposed by The United States Environmental Protection Agency (USEPA). Rice contributed the greatest quantity of DEHP to the daily intake in Cambodia so may deserve further exploration. To our knowledge, this is the first study to investigate the occurrence and the daily intakes of phthalate esters in Cambodia.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Phthalate esters concentration in daily foodstuffs collected from Cambodia. </LI> <LI> Investigate the bioaccessbility of phthalate esters via the foodstuffs consumption. </LI> <LI> Health risk evaluation of dietary exposure to phthalate esters. </LI> </UL> </P>

Analysis of variation and relation of climate, hydrology and water quality in the lower Mekong River

Hanh, Pham Thi Minh,Anh, Nguyen Viet,Ba, Dang The,Sthiannopkao, Suthipong,Kim, Kyoung-Woong IWA Publishing 2010 Water Science & Technology Vol.62 No.7

<P>In order to determine the influence of climate and hydrology on water quality of the lower Mekong River, the long term monitoring data (from 1985 to 2004) of climatic, hydrological and water quality variables were analyzed. In general, water quality was ‘good’ or ‘very good’ for most of the investigated water quality parameters including DO, pH, conductivity, nitrate, phosphate and total phosphorus. All climatic and hydrological elements as well as most of the water quality parameters varied seasonally. Throughout the 18-year period, only evaporation, water level and TSS showed a significant pertinent trend. ARIMA models results reveal that among climatic and hydrological paremeters, water quality could be effectively predicted from the data of discharge flow and precipitation. The results showed good R2 (≥0.7) estimation between predicted and observed values for TSS, alkalinity and conductivity which are the chemically and biologically conservative parameters. For other water quality parameters such as Ca2 + , Mg2 + , Si, Cl−, NO3−, and SO42−, the predicting results by ARIMA model were reliable in shorter period than the above three mentioned variables.</P>