The Philippine Toxic and Hazardous Wastes Act places limits on the quantities of toxic substances that may be discharged into the sewerage system. Guidelines on hexavalent chromium (Cr6+) limits the discharge amount to just 0.50 mg/L. If an industry dumps hexavalent chromium in the form of potassium dichromate (K2Cr2O7), what is the maximum allowable concentration of hexavalent chromium in % by volume and moles per liter of sewage water? Molar Mass: Cr=52, K=39.1, O=16

Q: A wastewater flow of 10,000 m³/d containing 400 mg/L BOD5 is to be treated in a rotating biological…

A:

Q: Anaerobic digestor was designed to process municipal solid waste having the chemical formula of…

A: Lets calculate the amount of methane gas produced per pound of waste placed in digester as follows:…

Q: A metal plating industry produces effluent containing Cu2+, Fe2+, and Ni2+ at concentrations of 25,…

A: Concentration of metals in effluent = 25, 25,35 mg/l Total concentration of metal in effluent= 85…

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: An industry wants to locate a chemical plant in your city, they expect to generate 25,000 gal/hr of…

A: k = 0.75/hr

Q: 1. To finish the design of the effluent discharge channel, determine the amount of activated carbon…

A: Step 1: try to write down equation  Step 2: simple  mole calculation  Step 3: weight of carbon  Step…

Q: Disinfection: Graph the following data for the inactivation of a virus using hypochlorous acid…

A: The data for inactivation of a virus using HOCl is as followsThe graph has to be plot and time…

Q: 2-21 Calculate the molarity and normality of the following: (a) 200.0 mg L-¹ HC1 (b) 150.0 mg L-¹…

A:

Q: The influent of a sewage treatment plant has a TSS concentration of 118 mg/L. What is the…

A: Given that:                      TSS Concentration in influent sewage = 118 mg/LTSS removal…

Q: Select the most suitable treatment for wastewaters given below. answer for the treatment of each…

A: Waste Water Optimum Treatment Explanation 50 mg/L NO3-N Ion-exchange  The ion exchange measure for…

Q: A single addition of chlorine yields a log kill every 5 minutes.  During a storm, levels in the…

A: Given: Single addition of chlorine yields  = 1 log kill in 5 min. Number is 100000 cells per ml. Nt…

Q: incoming waste, with BOD5 equal to about 200 mg/l is treated in a well-run secondary treatment plant…

A: BOD5 = 200 mg/LRemoval Efficiency =90 %Total Volume (V) = 300 mLInitial DO  (DOi) = 9.2 mg/LFinal DO…

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

A:

Q: 11.61 A 4.0% sodium fluoride solution is applied to increase the fluoride concentration from 0.4 to…

A: Given, Strength = 4% Initial fluoride = 0.4 mg/L Final fluoride = 1 mg/L

Q: disinfection. What should the sodium hypochlorite pump be set at?

A:

Q: 35 The average daily waste flow from a factory in an industrial estate is 75 m³ of stearic acid…

A:

Q: The wastewater having an organic concentration of 54 mg/l is flowing at a steady rate of 0.8 m³/day…

A: Given data- Organic concentration- Lo=54 mg/L,Q=0.8 m3/day,dimension 2 m×4 m×2 m.decay constant…

Q: How many gallons of 12-percent sodium hypochlorite solution are needed to disinfect a reservoir 20…

A: Given data: Hypochlorite strength = 12% Diameter of the reservoir D=20 ft Depth of the reservoir h=6…

Q: treatment plant with an average flow of 2.5 m³/s treats its water with alum (Al2(SO4)3 18H2O) at a…

A: Alum dose = 20 mg/LInitial organic matter concentration =Final organic matter concentration = 6…

Q: 2. You are asked to design a disinfection system with a capacity of 50,000 L/hr to achieve 3 log…

A: To determine the volume and dimensions of a chlorine contactor without assuming the length and…

Q: The local population is worried about their exposure to SO2 from Factory A mentioned in the previous…

A: As we all know that the concentration of impurities decrease as it moves in the atmosphere due to…

Q: Problem 3: A water treatment with an average flow of 2.84 m3/s treats its water with ferric chloride…

A:

Q: A chemical is added at the beginning of a water treatment plant at a target concentration of 8 mg/L…

A: Daily water required = Amount of population * Per capita demand Amount of population = 340,000 Per…

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.