Water quality of Chao Phaya River improves

Bangkok Governor Apirak Kosayodhin (อภิรักษ์ โกษะโยธิน) has inspected water quality at Chao Phaya (เจ้าพระยา) River, Rama VI Bridge. He said that the inspection reports that the water contains dissolved oxygen amount of 3.18 milligrams a liter, exceeding the standard amount by two milligrams a liter.

The governor revealed that there are more than 992,000 cubic meters of waste water released to the Chao Phaya River each day. At present, Bangkok has seven waste water treatment plants which are insufficient. The Bangkok Metropolitan Administration (BMA) has therefore constructed one more waste water treatment plant in Bang Sue (บางซื่อ) District which can treat 120,000 cubic meters of waste water per day. The plant is expected to be completed next year. BMA has also set plans to build two more waste water treatment plants in Khlong Toei (คลองเตย) District and the Thon Buri (ธนบุรี) side of Bangkok respectively.

Mr Apirak added that BMA is expediting a project to clean 80 canals in Bangkok within this year in line with Her Majesty the Queen’s speech.

In addition, BMA will arrange a campaign joined by residents living along the Chao Phaya River banks as well as government and private sectors to restore the river and build parks along the river.

Source: Thai National News Bureau Public Relations Department - 16 August 2007

Dissolved Oxygen

What to Expect

At 20 oC (room temperature) and standard atmospheric pressure (sea level), the maximum amount of oxygen that can dissolve in fresh water is 9 ppm. If the water temperature is below 20 oC, there may be more oxygen dissolved in the sample. Generally a dissolved oxygen level of 9-10 ppm is considered very good. At levels of 4 ppm or less, some fish and macroinvertebrate populations (e.g. bass, trout, salmon, mayfly nymphs, stonefly nymphs, caddisfly larvae) will begin to decline. Other organisms are more capable of surviving in water with low dissolved oxygen levels (i.e sludge worms, leeches).

k12science.org

Dissolved Oxygen

What to Expect

At 20 oC (room temperature) and standard atmospheric pressure (sea level), the maximum amount of oxygen that can dissolve in fresh water is 9 ppm. If the water temperature is below 20 oC, there may be more oxygen dissolved in the sample. Generally a dissolved oxygen level of 9-10 ppm is considered very good. At levels of 4 ppm or less, some fish and macroinvertebrate populations (e.g. bass, trout, salmon, mayfly nymphs, stonefly nymphs, caddisfly larvae) will begin to decline. Other organisms are more capable of surviving in water with low dissolved oxygen levels (i.e sludge worms, leeches).

k12science.org

Hm, how do you convert one to the other?

Edit: Ok I got it, 1 liter of water is one kilogram.

Why Dissolved Oxygen is Important

Dissolved oxygen analysis measures the amount of gaseous oxygen (O2) dissolved in an aqueous solution. Oxygen gets into water by diffusion from the surrounding air, by aeration (rapid movement), and as a waste product of photosynthesis.

was that the question ??

Why Dissolved Oxygen is Important

Dissolved oxygen analysis measures the amount of gaseous oxygen (O2) dissolved in an aqueous solution. Oxygen gets into water by diffusion from the surrounding air, by aeration (rapid movement), and as a waste product of photosynthesis.

was that the question ??

Oh sorry, I meant convert miligrams per liter to ppm.