Reasmey Tan

Institute of Technology of Cambodia · Research and Innovation Center

The addition of powdered activated carbon (PAC) and a coagulant during the coagulation-flocculation process is an easy and common option for tackling pollution peaks from organic micropollutants (OMPs) in the production of drinking water. However, the adsorption-desorption mechanisms during this process have not been thoroughly explored. Thus, this...

This study assessed the environmental footprint of emerging micropollutants in Cambodia and France. The aim was to develop and apply an analytical method to detect micropollutants in diverse water sources and climatic regions. Consequently, an analytical method, using online solid-phase extraction coupled with an ultra-performance liquid chromatogr...

A mineral is an inorganic substance that occurs naturally meanwhile heavy metal is one of the crucial contaminants in nature. The objectives of this study are to determine physical characteristics of the surface sediments by measuring through the grain size and to assess the distribution of minerals and heavy metals in sediments. The result of heav...

River pollution has been one of the most occurring phenomenal in Malaysia due to anthropogenic activities such as dumping, logging and industrial activities. In this study, the physical properties of the core sediments samples from 3 sampling points in Sungai Kelantan (known as KK3, KK4 and KK11) were analysed. The heavy metals concentration in the...

Antibiotics are the most potent drugs in the treatment of infections caused by bacteria. However, the rapid emergence of antibiotic-resistant bacteria (ARB) occurs worldwide, and ARB has become a threat to public health. Particularly in the floating villages in the Tonle Sap Lake (TSL), if pathogens associated with waterborne infection show resista...

Access to clean drinking water remains one of the major problems for the floating villages around Tonle Sap Lake. The lake water around houses in these villages was reported to be contaminated from their domestic wastewater; however, villagers still need to use the lake water for their daily life. Moreover, conventional treatment cannot efficiently...

Environmental issues are multidimensional. The consequences and impacts of environmental degradation are on a wide range of fields, including but not limited to socioeconomy, agricultural productivity, legislation, natural and life sciences, and engineering. To solve these complex environmental issues, a transdisciplinary research collaboration (TD...

Tonle Sap Lake, the largest freshwater body in Southeast Asia, plays an important role in lives and environment. The lake is reportedly under anthropogenic pressure and suffer from eutrophication. The floating villagers suffer from waterborne diseases. However, the shift in bacterial community due to human activities in this great lake has not yet...

Natural Organic Matter (NOM) is a complex matrix of organic materials commonly found in all sources of water, particularly surface water. The presence of NOM in source water has a significant effect on water quality, treatment process, and human health when the water consisting of NOM reacts with the disinfectant agents and thus results in disinfec...

Among fermented vegetables, fermented cucumbers are very popular and only sold in open markets. In Cambodia, people have been using traditional spontaneous and back-slopping fermentation to make small-scale fermented cucumbers for centuries. These traditional methods cannot be used for large-scale production as lactic acid bacteria (LAB) present on...

Among fermented vegetables, fermented cucumbers are very popular and only sold in open markets. In Cambodia, people have been using traditional spontaneous and back-slopping fermentation to make small-scale fermented cucumbers for centuries. These traditional methods cannot be used for large-scale production as lactic acid bacteria (LAB) present on...

Core sediments from two sampling points namely TM 2 and TM3 which are located at the Kelantan Rive near to Tanah Merah district had been collected to determine the vertical profile of heavy metals contents. TM 2 and TM3 were located near to gold mining area and agriculture area, respectively. The heavy metals in Tanah Merah were analysed using Atom...

Many brands of soy sauce are now being distributed and consumed across Cambodia. Although some are locally produced, there are also imported products from different countries including Vietnam, Thailand, Singapore, China, Malaysia, Hong Kong, Korea, Taiwan, Japan and France. Volatile compound is one of the major components defining quality of soy s...

Lactic acid fermentation is a traditional process to preserve foods and to modify their organoleptic properties. This process is generally conducted in a spontaneous way, allowing indigenous lactic acid bacteria (LAB) of the matrix and of the environment to compete and grow. The aim of this study was to better characterise LAB strains ability to mo...

As a treatment of water, coagulation of minute particles and disinfection of microbes are the most commonly used. The aim of this study is to optimize the appropriate condition of two different kinds (yellow and brown) of polyaluminum chloride (PAC), and alum with Ca(OCl)2 for the treatment of surface water of Tonle Sap River. The optimum dosage of...

The conventional treatment practices by villagers of usage alum can cause overdosing of concentration of alum since it can cause the water taste to be sour and is considered as the health risk in drinking water such as vomiting, diarrhea, mouth and skin ulcers, and so on. Therefore, the objective of this study was conducted by comparing the effects...

This study is aimed to evaluate the price and quality control of different soy sauces sold in the markets. Four local markets and five supermarkets were selected to survey the price and collecting samples. To analyze the quality of soy sauce, pH, salt content, soluble salt - free solid, reducing sugar, total nitrogen, amino acid nitrogen, halophili...

Industrial and sand mining activities have severely degraded the water quality of the Kelantan River, as well as the river ecosystem. However, there have been inadequate studies on the effect of industrial and sand mining on organisms in the Kelantan River. Therefore, this study assessed the concentrations of Pb, Cd, Zn and Cu in the bivalves of ge...

Tonle Sap Lake (TSL), the largest lake in South East Asia, is under increasing pressure from pollution, land-use change, climate change, and development activities in the lake, its basin and the Mekong Basin. Recent changes in the lake hydrological system and its floodplains are becoming a great concern for hundreds of communities relying on the la...

Harmful bacteria and algae have been detected in the lake and surrounding waters with the help of a novel analytical approach developed in this project. Their extended survival in the lake water increases the vulnerability of the people living in floating villages. In addition to the intensive investigation of those pathogenic microbes in different...

Harmful bacteria and algae have been detected in the lake and surrounding waters with the help of a novel analytical approach developed in this project. Their extended survival in the lake water increases the vulnerability of the people living in floating villages. In addition to the intensive investigation of those pathogenic microbes in different...

South-East Asia is well-known for traditionally fermented foods. However, these products are generally still produced at small scale following traditional procedures. Nowadays, consumers are particularly aware of the health concerns regarding food additives; the health benefits of “natural” and “traditional” foods, processed with no added chemical...

Tonle Sap Lake, the largest freshwater body in Southeast Asia, plays an important role in lives and environment. The lake is reportedly under anthropogenic pressure and suffers from eutrophication. The floating villagers suffer from waterborne diseases. However, the shift in bacterial community due to human activities in this great lake has not yet...

Tonle Sap lake in Cambodia is the biggest lake in Southeast Asia. It is estimated that this lake accounts for ca. 60% of domestic protein needs and more than 1 million people stay at the floating villages on the lake. However, they use the lake water directly without sufficient treatments. Therefore, they are under threat of unsanitary water enviro...

Water sources in the Cambodia are being contaminated by the untreated wastewater discharge from the city; however, the biological water quality data is scarce in the region. We investigate the presence of Escherichia coli (E. coli), coliform and its gene (uidA) in Mekong river, Tonle Sap river and Tonle Sap lake since this environmental water was a...

Fermentation has been used for centuries to produce food in South-East Asia and some foods of this region are famous in the whole world. However, in the twenty first century, issues like food safety and quality must be addressed in a world changing from local business to globalization. In Western countries, the answer to these questions has been ma...

The freshwater ecosystem has been depleted gradually by human activities along the rivers including the waste disposal, which will contaminate water ecosystem, and uncontrolled widely antibiotic use in aquacultural purpose. Fecal contamination and the presence of antibiotic-resistant bacteria can cause serious problems to people living along the la...

Microbial community is a group of microbial species that share a common space. One of the important focuses of research about those microbes is the mechanistic understanding of their interactions with environment. Therefore, we investigated the relationship between microbial community and physico-chemical factors in a large tropical shallow lake, T...

People who are living along the Mekong River and Tonle Sap River use the river water daily for swimming, drinking for sometimes, cooking, doing laundry and cleaning vegetables. Therefore, there is a chance for them to be contaminated by pathogenic bacteria present in the water. If these bacteria can survive longer in the water, it will be more seri...

Tracing the fate of pathogens in environmental water, particularly in wastewater, with a suitable methodology is a demanding task. We investigated the fate of Escherichia coli K12 in sewage influent and activated sludge using a novel approach that involves the application of a biologically stable dialysis device. The ion concentrations inside the d...

Antibiotics have saved millions of lives by protecting against infectious diseases. Recently, however, the rapid emergence of antibiotic resistant bacteria is occurring worldwide and it becomes a threat. Especially, in the water environment, if the pathogens associated waterborne infection show a resistance against antibiotics, they are severe prob...

There are many concern about the proliferation of virulent enteric microorganism and the bloom of cyanobacteria in the environment water. Health risk, environmental vulnerability has captured the attention since the water source is being threaten by the human activities such as industry, agriculture or the discharge of wastewater from the city. Abo...

Asian white radish is a popular root vegetable in asia. It can be consummed as fresh, dried, salted and pickle products. Japanese pickle vegetable (nukazuke) fermented in rice bran bed. There is no research related to this fermentation in Cambodia. Therefore, the ojective of this study is to optimize the white radish fermentation wtith rice bran. I...

Biodiesel is a renewable green fuel obtained through the transformation of animal and vegetable fats, as well as used oil. This biodiesel can replace fossil diesel. The production of biodiesel from recycled oils is comparable in quality to that virgin vegetable oil biodiesel with an added attractive advantage of being lower in price. The current re...

In Cambodia, the fermentation of different kinds of vegetables such as cucumber, Cambodian melon, green mustard and cabbage uses spontaneous fermentation process by which sugars are converted into lactic acid by lactic acid bacteria (LAB) naturally present on the skin of vegetables.Eventhough LAB were used, the type of LAB might be different for ea...

The emission of hydrogen sulfide (H2S) near the estuary of a regional river (Tokyo, Japan), which is thought to be caused by biological reduction of sulfate in seawater mixing with overflow wastewater, poses a severe environmental problem. In order to investigate vertically the biochemical alteration of the river under the long-time treatment for t...

This study investigated the effect of heat-alkaline treatment (HAT) at pH 11 and 60 °C on volatile fatty acid (VFA) production and protein degradation in excess sludge, soluble and insoluble proteins, and pure cultures. In addition, quantification of bacteria present in the sludge was also examined. Experimental results showed that following acid f...

This study examined the effects of combining heat-alkaline treatment (HAT) with an acclimation process on sludge reduction. Changes in sludge components and microbial communities in both the mixed liquor suspended solids (MLSS) and supernatant fractions were monitored throughout the process. HAT was performed under different pH conditions (pH 7, pH...