
Maple
数学软件
• Maple 教育学术版 • Maple 学生版 • Maple Learn 在线虚拟黑板 • Maple 计算器(手机App) • Maple 专业版 • Maple Flow 计算白板 • Maple 个人版
The protection of public health from the transmission of waterborne diseases by disinfecting water has been recognized since the early 1900’s. Of the existing processes used to produce safe drinking water, chlorination of public water supplies ranks as one of the most important.
Chick’s Law was later modified by H.E. Watson (1908) to include the coefficient of specific lethality . The Chick-Watson Equation is shown below.
Where:
initial number of organisms
number of organisms at time t
concentration of disinfectant (mg/L)
contact time (min.)
coefficient of specific lethality
coefficient depending on
disinfectant type and pH