A woman weighing 78 kg drinks 2 liters per day of water that contains 5 mg/L of Contaminant X. If she drinks this water for 70 years and the cancer slope factor of Contaminant X is 0.67 kg-day/mg, determine the cancer risk from this exposure.

Q: A waste water is to be disinfected with chlorine to kill 90% of microorganisms. The number of…

A: As Per question,

Q: Suppose you are to measure the BOD (biochemical oxygen demand) removal rate for a primary wastewater…

A: From the given data,now calculating   for the treated sewage is,Substitute all the values, we get…

Q: treatment system treating 1.0 m3 /s of water includes a filter followed by a  chlorine contact…

A: We have to find concentration of pathogens in outlet of chlorination tank and volume of chlorination…

Q: 1. Of the members of a bowling league, 10% are widowed. If 200 bowling league members are selected…

A: p = 10% = 0.1 n = 200 k = 10

Q: The urban heat islands occur when cities replace natural land cover with pavement, buildings and…

A: Clay tiles- It is a type of building material. It is mainly used as a roofing material.

Q: Problem 6.1 A small stream was found to be contaminated with Lindane, a pesticide known to cause…

A: Given data - Qi = 100 cm3/sec Ci = 50 mg/L For station (1) ,Cdye = 10ug/l CL2 = 0.5 ug/l For station…

Q: how long will it take to achieve the same 99% killing rate for the virus? (assuming other conditions…

A:

Q: According to data from the California Air Resources Board, 1989 listing typical ambient average…

A:

Q: When drinking water is disinfected with chlorine an undesired byproduct, chloroform, is formed.…

A: Given data70-kg person drinks 2 L of water every day for 70 years chloroform concentration =0.1 mg/L…

Q: you collect a 1-liter sample of water from a river and perform a BOd test in the lab. at the…

A:

Q: (a) A strain of E. coli bacteria taken from a sample of waste water in a treatment plant are…

A: (a) N = Aekt (i) A/q at t=0 N = 20 So, 20 = A * ek*0 or, A = 20

Q: A sample of wastewater is mixed with 2 parts clean water and placed in a bottle. The pO of a sample…

A: Given data in question  Dissolved oxygen  Reaction rate constant  To find out  BOD5

Q: Pesticide in a reservoir. A reservoir is used to catch runoff during storms for a development.…

A: Part-1-  First order reaction -  ln(AoA) = Kt here, Ao = Initial concentration A = Remaining…

Q: In an insecticide-manufacturing unit, the gases coming out of a micro-fine grinding unit, containing…

A: sulfur content=600 μg/m3flow rate=1000 m3/minute

Q: for a contaminant is 10 ug/L. What potency would produce this value?

A: A Drinking Water Equivalent Level (DWEL) is a lifetime exposure level to drinking water, assuming…

Q: A paint shop buys 52,000 liters of car paint based on VOC. In one year, they applied 50,800 liters…

A: Given data52000  liters of car paint Applied 50800 liters of same same point into the products…

Q: A family eats homegrown vegetables daily which is irrigated with water from a river polluted with…

A:

Q: 10

A: Given:- a1=0.2ppm/ton a2=0.2ppm/ton background pollution is 40 ppm, pollution from source 1 is 100…

Q: Families in a community in a developing country use large, 200.0 L drums to un-treated surface…

A: Since we only answer up to 3 sub-parts, we’ll answer the first 3. Please resubmit the question and…

Q: Concentrations of toxaphene in fish may impair human health and fish-eating birds (such as bald…

A: Correlation is a statistical measurement of the extent to which two variables are related. In…

Q: A step-dose tracer test was conducted on the clear well of a water treatment plant. A constant…

A: Given, The constant fluoride dosage C0 = 2.0 mg/l C20=0.10 mg/l

Landfills

The landfill is a site used for the disposal of waste materials. The landfill is a solid waste facility that is often known as a dumping ground. The image below shows a landfill site in Hawaii. Landfilling is the most ancient and common method used for the disposal of waste. For the landfill, a deep trench is constructed in an isolated place away from the city. The trench for landfills is designed properly after analyzing the total population and the waste generation per capita. The waste is dumped into the trench and after every layer of waste, a layer of soil is spread on the top of it.