英语翻译The Method2.1 Biochemical Oxygen Demand (BOD)The biochem

英语翻译
The Method
2.1 Biochemical Oxygen Demand (BOD)
The biochemical oxygen demand (BOD) of waste water,industrial effluents and surface
water is an expression for the amount of oxygen consumed by the decomposition of
organic matter in a biochemical process.BOD measurement is an important analytical
tool in determining the effects of effluents on water treatment plants and surface water
systems.
2.2 BOD Sensors
(R)
The OxiDirect is a respirometric BOD measurement system,where BOD is determined
in the bottle itself,without prior dilution.This method offers a range of advantages,
compared with the so-called dilution method.The sample can be tested undiluted
form; the measurement range is wider; the amount of work involved is significantly
less.
2.3 Principle of Measurement
The BOD measurement unit,consisting of the sample bottle and the BOD sensor,
represents a closed system.In the bottle,above the sample itself,is a defined air
space.During the BOD measurement the bacteria in the sample consume the dissolved
oxygen in the sample.This is replaced by oxygen out of the air within the bottle,above
the sample.The carbon dioxide released at the same time is chemically bounded by
the potassium hydroxide in the seal gasket.This generates a decrease of pressure
within the system.This is measured by the BOD sensor and displayed as a BOD value
in mg/l O2.

2.1 Biochemical Oxygen Demand (BOD)
The biochemical oxygen demand (BOD) of waste water,industrial effluents and surface
water is an expression for the amount of oxygen consumed by the decomposition of
organic matter in a biochemical process.BOD measurement is an important analytical
tool in determining the effects of effluents on water treatment plants and surface water
systems.
废水,工业废水和地表水的生化需氧量（BOD）就是指有机物在生化反应中分解过程中的需氧量.生化需氧量（BOD）是衡量废水处理设备和地表水处理系统的性能的重要参数.