THE JOURNAL OF KMUTNB

Volume 32, No. 02, Month APRIL, Year 2022, Pages 398 - 414

Assessment of water quality in khlong yai river in rayong province by chemical index (ci)

Sunisa Ungwiwatkul, Susira Bootdee

Abstract Download PDF

Khlong Yai River is important to the people of Rayong Province for both consumption and agricultural proposes. Presently the city has a dramatic industrial expansion and its population is increasing, the result of which is an increase in water demand and discharge. Thus, it is necessary to consider the quality and cleanliness of the water before using. This research aims to study the assessment of water quality in Khlong Yai River at Rayong province by using the chemical index (CI). The chemical index (CI) was calculated from 8 parameters including water temperature (WT), electric conductivity (EC), pH, Dissolved Oxygen (DO), Biochemical Oxygen Demand (BOD5), Nitrate-N (NO3- -N), Ammonium-N (NH4+-N) and Orthro-phosphate (O-PO43-). The water samples were collected from 6 sites of river in rainy, winter, and summer seasons. The result found that the water quality of Khlong Yai River in rainy season was “moderate” to “clean” in accordance with the CI, while that of winter season was “pollution” to “clean” and summer season was rated as “moderate” to “fairly clean”. However, the water quality of Khlong Yai River in all seasons were not significant difference (p>0.05). Based on the observed data, it is concluded that Khlong Yai River could be classified as in class 2 of the surface water quality standard.This study suggested that the water quality information can be used for water resources management in Rayong province to accommodate to plan of Eastern Economic Corridor (EEC).

Keywords

Water quality index; Chemical index; water pollution; Khlong Yai River; Rayong province

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