Determine the individual Hazard Quotients and the overall Hazard Index associated with a 70 kg adult eating 15 g fish every day that contains 9.8 μg/ kg of Arochlor 1254 and 1 mg/kg of Methylmercury? Arochlor 1254 can exhibit noncarcinogenic effects in humans. Methylmercury has been shown to cause developmental neuropsychological impairment in human beings. The RfD for methylmercury is 1x10-4 mg/kg-day and the RfD for Arochlor 1254 is 2 x 10-5. Also, comment on the risk involved, based on the individual Hazard Quotients.

Q: The number of germs in a certain culture increases at a rate proportional to the number present. If…

A: Given population becomes double in every year

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: A woman weighing 78 kg drinks 2 liters per day of water that contains 5 mg/L of Contaminant X. If…

A: Given: The weight of the woman is 78 kg. The ingestion rate is 2 L/day. The concentration of…

Q: In surveying a laboratory, a health physicist wipes a contaminated surface and runs an absorption…

A: There is a possibility that the contaminant is radium-226, which has a beta particle range of up to…

Q: Chemicals are characterized as carcinogens and non-carcinogens for: a developing treatment…

A: Chemicals are classsified as carcinogens and non carcinogens for the purpose of risk assesment,

Q: If the 3-day BOD (BOD3) of a waste is 75 mg/L and the BOD decay constant, k, is 0.345 day-1 , what…

A: Appreciate if there is detailed work with explanation and finds you helpful for ease of…

Q: Which of the following doses presents the minimum violation to the OSHA standards? (¿Cual de los…

A: Explanation :        The OSHA ( i.e. Occupational Safety and Health Act ) includes the provisions…

Q: A 200 m3 lagoon used for raising salmon has its water constantly being replaced in a rate of 7.0 m3…

A:

Q: = A waste stabilization pond is used to treat a dilute municipal wastewater before the liquid is…

A:

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

A:

Q: The disinfection process is used to deactivate the pathogenies microorganisms in water. Consider…

A: To calculate the necessary chlorine dose for disinfection, we consider chlorine demand caused by the…

Q: If the alum dose required to coagulate is 10 ppm, find out the amount of alum (in quintals) needed…

A:

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

A:

Q: 2. 20 g/l solution of a chemical tracer was discharged into a stream @ 0.01 l/s. At sufficiently far…

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: At a given time of a Hydrometer test, let's say the observed reading was 40 g/l. What information is…

A: A hydrometer is a device that measures a liquid's density or specific gravity.

Q: no-modal distribution

A: Stage 1 Nanoparticles might be made in an assortment of ways. A portion of these may likewise be…

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: Which group of constituents is considered nutrients? Nitrate, chloride, and ammonia O Phosphorous,…

A:

Q: Consider CSTRs in series follows a first-order reaction with the same rate constant as shown in…

A: SOLUTION:

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: Engineers studied the degradation kinetics of Chemical X in a beaker without inflow and outflow. The…

A: Objective: To determine the half-life of chemical X.   Given: Initial concentration of chemical X (t…

Q: Initial population of E.coli bacteria was estimated as 1 million counts per 100 ml. The growth rate…

A: E. coli: It is a bacterium that lives in the intestines on a regular basis. Some animals' intestines…

Q: Calculate the risk for a compound with toxicity dose of 10 ug/L, unit risk (RU) of 3.2 x 10-5 L/mg…

A: The formula to calculate the Risk is given by, Risk=Unit Risk×Toxicity dose×Exposure timeTotal time

Q: 20 g/l solution of a chemical tracer was discharged into a stream @ 0.01 Vs. At sufficiently far…

A:

Q: A 30 g/1 solution of a fluorescent tracer was discharged into a stream at a constant rate of 12…

A:

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: For the rectangular horizontal-flow sedimentation basin and influent particle- settling…

A: Given, Flow rate in sedimentation basin, Q=7570m3/day=7570m324hr=315.42m3/hr Length of basin, L=30m…

Q: 3. Find the concentration of polychlorinated biphenyls in drinking water that would result in a 10-6…

A: The concentration of polychlorinated biphenyls (PCBs) in drinking water that would result in a risk…

Q: What are the factors that affect the calculation of Cc, Cv and Cd values ​​in a fluid flux through…

A: Factor that affect the Calculation of,  Cc (Coefficient of contraction)It is determined by the…

Q: Use the table below to calculate the following: The concentration (in mg/L and mol/L) of the…

A: Calculate formula weights (FW) for Al2O3 and Al2(SO4)3.14H2O Take molecular weight of Al=27 g/mol,…

Q: atch Reactor with a volume of 11.859 m³ is being used to treat liquid waste from a small seafood…

A: According to given data  Every week 1.461 kg of waste is added to the reactor with water, so that…

Q: of deficiency in the indicator diagram?

A: To find : Not effect of deficiency.

Q: You are asked to complete an investigation into the efficiency of removal of your toilet. The bowl…

A:

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: A river, flowing at 1.5 m3/s, is polluted with the pesticide permethrin and flows into a lake (100 m…

A: Answer  (a) Calculation of Concentration of permethrin entering the lake In order to determine the…

Q: 4. Chlorine is used for primary disinfection at a water treatment plant that treats 0.55 m³/s of…

A: Given: Flow rate (Q) = 0.55 m³/sGiardia inactivation rate constant (k*) = 0.55 min⁻¹Free chlorine…

Q: 20 g/l solution of a chemical tracer was discharged into a stream @ 0.01 V/s. At sufficiently far…

A: q=0.01L/s C1=20g/l Co=0 Cp=5 ppb To find stream discharge

Q: The half-life of lodine-131 (I-131) is 8 days. If 294 grams of I-131 were released to the…

A:

Q: Bleeding may decrease by adding Na20H and CaC12 CaCl2 and K20 Na20 and CaCl2. O CaCO3

A: Bleeding is caused due to presence of excess water in concrete. As result of bleeding, water from…

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: If the alum dose required to coagulate is 10 ppm, find out the amount of alum (in quintals) needed…

A: Given data- Water to be treated Q=10 MLD=10×106 litres/dayAlum dose=10 ppm=10 mg/LTo Find-Amount of…

Q: The residential drinking water in a small town with a population of 50,000 has been detected to…

A: Question is based on a small town whose population is provided in the question. Concentration of…

Q: Poorly treated municipal wastewater is continuously discharged directly into a lake. The discharge…

A: The pollutant balance equation for the steady-state is: In-out-Decomposed=0  Also Accumulation=0

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.