|City Name||Korat, Thailand|
|Project Name||Construction of small-scale treatment facilities for domestic wastewater|
Description of Project
The water pollution of Lam Ta Kong River, which flows through the center of Korat, has become serious in recent years. According to a study conducted by the Environmental Research and Training Center (ERTC) in Thailand, BOD was found to be 2ppm upstream and 28ppm downstream, and ammonia nitrogen was recorded as 0.78ppm upstream and 11ppm downstream. Because there are no pollutant sources such as factories or livestock industries in the city center, it is ascertained that the main reason for this pollution is wastewater from residences along the river. A sewage treatment plant is in operation in the southern half of the city however, the northern section has low residential density and sewage facilities are not adequate.
Domestic wastewater flows directly to the river through open drains. Korat has developed plans to construct small-scale wastewater treatment facilities at seven points where the water pollution is particularly severe. Of those seven facilities, two have already been constructed on an experimental basis and, with the collaboration of ERTC, river clean-up activities were carried out with the participation of residents.
In Korat, electric power is not used in wastewater treatment and anaerobic treatment methods that require little maintenance are used. However, in studying the successful practices of other cities and gathering the opinions of experts (technical proposal), it can be understood that the location and capacity of the facilities is an issue, as well as the use of anaerobic treatment methods. Based on analysis of the amount of wastewater, Kitakyushu City specialists dispatched with an IGES mission to Korat in May 2002 have concluded that it would be beneficial to establish treatment facilities making use of aerobic treatment methods, as well as constructing one model plant. In this way, a comparative analysis can be conducted on the treatment performance between the existing and new model plants. Additionally, activities will be carried out to decrease the disposal of garbage directly into the river, as well as resident participation in clean-up activities and river eco-tours.
The project was implemented from October 2002 to September 2003. Twelve simple water treatment plants were constructed in communities along the Lam Ta Kong River. Water quality was measured three times during the project period (February 2003, August 2003, September 2003) according to the following parameters: time, air and water temperature, PH, BOD in and out. The data from the 12 sites show that 40-50% of BOD was purified through the use of simple wastewater treatment filters. Other activities were also carried out to decrease the disposal of garbage directly into the river, enhance resident participation in clean-up activities twice per month and promote river eco-tours. Public awareness campaigns were carried out through information dissemination via local newspapers, magazines and radio programmes.
None at this time