6. 7. T Is UV disinfection more likely to be used by drinking water utilities that use groundwater or surface water sources? Explain your answer. Hint: are viruses, protozoa, or bacteria more of a concern with groundwater or surface water? 8. L Treatment facilities have multiple ion exchange resin present in series. Why? A desert community pumps groundwater from an aquifer that contains a hazardous amount of arsenic. The community has no alternative water sources. List at least two advantages and disadvantages of using reverse osmosis for this application relative to ion exchange.

limitation of reverse osmosis water treatment technology

A water source has a flow of 10 MGD, alkalinity of 275 mg/L in CaCO3, and a pH of 8.85. What will the alkalinity be after addition of 150 mg/L NaOH? Present your answer in mg/L as CaCO3. Assume a close system.

For each of the following indicate if the designated technology is appropriate for the indicated water-quality problem. Explain why or why not (answer in no more than a few sentences). e. Activated carbon for groundwater contaminated by BTEX (benzene, toluene, ethylbenzene, and xylene) from a gasoline spill. f. Filtration for taste and odour. g. Lime treatment for hardness of 90 mg/L as CaCO3.

What is BOD? Write down its purpose in wastewater treatment. Is it possible to detect BOD by using biosensors? Justify your answer.

1. Based on the water filter activity, how would you design a water filter to clean the water you would be using at home? a. What pollutants would you need to filter out? b. What materials would you use to filter each kind of pollutant?

****the report**** We choose a specific industry Water Requirements Characteristics polluted water characteristics Its effects on water

I need it fast.  Question:- As a professional engineer suggest and explain four techniques of end of pipe treatment of coal fired powerplants to reduce its environmental impacts.

Sanitary Engineering Potential of Hydrogen (pH)   same question please help me: 1. Discuss the relationship between (a) pH and hydrogen ion concentration (b) pH and hydroxideion Concentration?2. Why is it necessary to maintain the pH of water nearly 7?

Q1.Clearly indicate if each of the following is True or False 1) The amount of bypassed water in split treatment of hardness depends on material balance on Mg². 2) Most water treatment plants in Iraq are using polymers as a coagulant. 3) In drinking water, most of alkalinity comes from SO4². 4) Circle or ring system is the most common method used now to design water distribution systems. 5) Fecal Coliforms and E-Coli are generally pathogenic and we need to test them to avoid their diseases. 6) In flocculation process, we need rapid mixing to enhance formation of flocs for better settlement. 7) In filtration, the only mechanism involved is the straining. 8) It is better to travel downhill, avoid rush hours, and avoid left turn when designing a route for packers. 9) Ozone in Stratosphere layer helps prevent UV light from reaching earth and causing skin problems. 10) Transfer station is used to transfer solid waste to final destination in more efficient way.