Oxygen balance in the Chao Phraya River estuary / M. B. Pescod, Sermpol Ratasuk
โดย: Pescod, M.B.
ผู้แต่งร่วม: Ratasuk, Sermpol | Thailand Institute of Scientific and Technological Research
Language: English ชื่อชุด: Res. Proj. no. 34/2 ; Rep. no.1ข้อมูลการพิมพ์: Bangkok : Thailand Institute of Scientific and Technological Research, 1968 รายละเอียดตัวเล่ม: 80 p.หัวเรื่อง: Chao Phraya River | Oxygen balance | Waste water | Water -- Pollutionสารสนเทศออนไลน์: Click here to access full-text สาระสังเขป: Studies on oxygen sinks and sources of the estuary indicate that the atmospheric reaeration process and the biochemical oxygen demand due to dissolved and suspended orginic pollutant are most important in the oxygen balance. The reaeration coefficient, K , and the average rate of photosynthetic oxygen production, the parameter "a", are estimated to be 0.205 per day, to base 10, and 0.032 mg/1 per day, respectively. Form the results of field surveys, it is estimated that about 145,000 kg of 5-day 20 degree celsius BOD gain access to the estuary. The laboratory deoxygenation coefficient, K , and the probable average rate of oxygen demand of river muds, the parameter "p", are found to be 0.13 per day, to base 10, and 0.13 mg/1 per day, respectively. Only traces of ammonia nitrogen are found in the estuarine water compared with high concentration of nitrate nitrogen. On a theoretical basis, it is deduced that nitrification is insignificant to the oxygen balance of the estuary, and a more comprehensive study of the kinetics of dentrification in the estuary is recommended before nitrate can be relied upon as a reserve oxygen source at times of extremely low dissolved oxygen concentration in the estuary. Authors.สาระสังเขป: The report presents the main results of research carried out to date on many aspects of the oxygen balance in the Chao Phraya River estuary, which receives essentially untreated wastes from a population of more than 3 millions in Bangkok and Thon Buri. The results of three general pollution surveys of the estuary are used together with data collected for specific purposes. Various aspects of the estuarine by hydraulics are reviewed and the concept of equivalent half-tide distance is developed for use in plotting oxygen sag curves for the estuary. A broad conclusion is that the estuary condition is worsening each year and that anaerobic conditions are likely to occur in the near future in the reach central on km 41 at low river discharge. However, at high river discharge, the estuary can tolerate the likely pollution load in the foreseeable future without causing problems near Bangkok and Thon Buri.
| ชนิดของทรัพยากร | Location | Call number | สถานะ | Last seen | Copy No. | บาร์โค้ด |
|---|---|---|---|---|---|---|
|
วว. เทคโนธานี | Available | 2018-08-31 | 1 | RP1968/241 | |
|
|
วว. เทคโนธานี | Available | 2018-08-31 | 2 | RP1968/241-2 |
There are no comments on this title.