Heavy metals are hazardous to environment and living beings. One of the common sources of heavy metals is from electroplating wastewater. Assume that there is an electroplating factory located nearby a rural community, and that the wastewater discharged from the electroplating factory can potentially reach the rural community. According to this scenario, give your suggestions of practical ideas on how you will act to protect the rural community from the deleterious effects of the heavy metals.
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- Provide a general mathematical model/equation of electrocoagulation in waste water treatment.Your organization has been hired to provide a water treatment process or device toremove toxic Chromium 6 [Cr(VI)] from water emanating from an underground source.Your organization has developed a treatment process that removes most of the Cr(VI)from the water to a residual concentration of 0.05 mg/L which is an acceptable level inline with the World Health Organisation. The underground water flows at 40 m3/h andhas Cr(VI) concentration of 100mg/L. The effluent flow rate is 97% of the influent flowrate, and the remainder of the water is discharged as wastewater. Calculate theconcentration of Cr(VI) in wastewater.An industry wants to locate a chemical plant in your city, they expect to generate 25,000 gal/hr of waste containing 800 mg/L of BOD wastes (reactive) and 15,000 mg/L of inert (non-reactive) materials. The industry wants to recycle 300 gal/min (containing 20 mg/L BOD and 400 mg/L of salts) of discharge (effluent) from the municipal wastewater treatment plant to dilute their waste to 6,000 mg/L of inerts prior to pre-treating the wastes on their own property. If the rate constant for the first order degradation of BOD5 to be 0.75/hr, how big must the reactor be to treat the BOD entering the reactor to 200 mg/L?
- A light manufacturing facility produces 125,000 gallons per week of sanitary sewage and uncontaminated wash water which are discharged to a municipal sewer system. A small parts rinsing operation flushes about 12 ounces per week of trichloroethylene down the sink. Does the facility have to manage their wastewater as hazardous waste (see 40 CFR 261.3)?Problem 6. A new manufacturing facility is being located in your town. It plans to produce 2,000 m³/day of a wastewater that consists primarily of water and the chemical phenol dissolved in it at a concentration of 5 mg/L. Phenol has a chemical formula of C,H5OH. The company has asked the municipal wastewater treatment to consider treating this industrial waste. Your plant currently treats 30,000 m³/day with an average influent of 350 mg COD/L. a) Estimate the increase in COD loading (kg COD/day) if you accept the industrial waste discharge? b) Estimate the additional amount of oxygen (in kg O2/day) needed to oxidize the phenol at the treatment plant.An industrial waste with a flowrate of 110 L/min contains 40 mg/L of zinc. Calculate: 1.) the pH required to maintain a zinc concentration of 2.6 mg/L (EPA's industrial limit for discharge into a sanitary sewer), and 2.) the dose of hydrated lime (Ca(OH)2) required (g/min).
- 3. A hard drive manufacturer uses Nickel to plate its disks and then polishes them, resulting in a concentration of 50 mg/l in their 50,000 gallons per day wastewater stream. Their industrial permit standard for Ni discharge into the sewer system and treatment plant is limited to 0.2 Ibs./day. What percentage of the mass of Nickel must the onsite treatment system remove to be in compliance with the discharge standard? Use the following formula to determine the daily Nickel loading of the manufacturing system: Loading (Ibs/day) = Conversion Factor (8. Flow(MGD)What is BOD? Write down its purpose in wastewater treatment. Is it possible to detect BOD by using biosensors? Justify your answer.Which of the following plastics are intentionally lost into wastewater? O Tire rub off O Microparticles in personal care products like exfoliants and cleansers O Wet wipes O Synthetic textiles
- Working for the local wastewater treatment plant, you are asked by the labtechnician to help her set up BOD5 tests. The issue here is what dilution to use to get the BOD5 test to give an acceptable result. Of course, you do not know the actual BOD5 value, but you are able to determine from past tests that the total ultimate BOD (NBOD + L0) of the wastewater is546 mg/L and the organic Nitrogen (TKN) concentration of the wastewater is 32 mg N/L. You also know that the first order rate constant for the BOD test is 0.25 day-1. When you ask, the technician tells you that the normal DO concentration at the start of the test is 8.3 mg/L.Based on all this information, tell the lab technician which of the following wastewater sample volumes added to a standard BOD test bottle (300 mL) is going to produce an acceptable final result: 1 mL/3 mL/9 mL/30 mL/90 mL NOTE: Acceptable BOD test should comply with the two essential criteria: DOfinal ≥ 2 mg/L and DOinitial – DOfinal ≥ 2 mg/L.Which of the following statements is FALSE? a.The drain current contains the same amount of inert as the fresh feed when steady state is reached.Drainage current and recirculation current have different compositions.c.In recirculation, the proportion of inert in the feed to the reactor increases.d.Total turnover in a recycling process is always higher than turnover in a simple review.e.Recycling increases total sales.Which of the following is not a piece of EPA legislation designed to protect the environment? Clean Water Act Clean Air Act O Civil Rights Act ORCRA D Question 2 What water contaminant was responsible for the 2014 Flint, Michigan water crisis? O Mercury Lead O PCB Giardia Question 3 What condition must be satisfied for us to use the Continuously Stirred Tank Reactor (CSTR) approach? Uniform well-mixed conditions Mixing occurs only in the axial direction The substance is conservative There is only one inflow channel D Question 4 A plug flow reactor is O Less efficient at removing pollutants than a CSTR Has the same efficiency at removing pollutants as the CSTR More efficient at removing pollutants than a CSTR Can be more or less efficient than the CSTR depending on the pollutant