สาหร่ายในกระบวนการผลิตน้ำประปาที่โรงผลิตน้ำประปาสามเสน / ทันดาว ทองตัน = Algae in water treatment process at Samsen Water Treatment Plant / Thandao Thongtan
The objectives of this research are to study the physical, chemical and biological quality of the water in the water treatment process and also evaluate the efficiency of the process. Samples were collected from five stations in Samsen Water Treatment Plant, namely: Raw Water (RW), Clarified Water (CW), Backwash (BW), Filtered Water (FW), and Tap Water (TW). The results of the study found that the annual average of raw water quality in year 2001 are: temperature 29.5 ํC.; pH 7.28; conductivity 230 micro S/cm.; turbidity 104 NTU; oxygen consume 4.12 mg/L.; dissolved oxygen 5.71 mg/L; and nitrate 0.23 mg/L. The study on algae also showed that there are 3 prominent divisions of algae found in the process. These are Chrysophyta (Golden-Brown Algae), Cyanophyta (Blue-Green Algae) and Chlorophyta (Green Algae). For Chrysophyta, the most rominent class is Bacillariophyceae (Diatom), and the most prominent genus is Nitzschia sp. and followed by Cymbella sp. For Cyanophyta, the most rominent genus is Oscillatoria sp. followed by Phormidium sp. For Chlorophyta, the most prominent genus are Chlorella sp. and Closterium sp. The efficiency of this treatment process is in accordance with relevant standards. Moreover, it is capable of removing the algae contamination at 99.52%. However, it is found that there is small algal contaminated in tap water, wuch as Oscillatoria sp., Phormidium sp. and Achnanthes sp.
