Question

We never learned this and I can’t find it in the textbook but the assignment is still due. I could really use the help and a brief explanation on how to go about this problem. Thank you

Homework 2 ENV 3006C 2018 1. A small sheep farm produces a waste flow of 10,000 gallons per day. The concentration of [TOC] total organic carbon is 600 mg/L. The flow is directed to a lagoon that aerated and mixed. The reaction rate is 0.21/day. If the hydraulic residence time (HRT) is 1.5 days, what is the [TOC] effluent concentration? 2. UV-light is used to kill bacteria when treating water on a ship. The degradation rate (kill rate) is 0.035/sec. The influent concentration is 1.5 x 101 CFU/L (bacteria). The standard for treatment (required effluent concentration from reactor) is 0.01 CFU/L.The reactor is a long tubular glass pipe, 6"diameter with a flow rate of 20,000 gallons/day. What length of glass pipe (L) is needed? 3. Kiwicide (k-cide) is a weed killer used on driveways and pathways. The concentration of k-cide is 400 μg/L in a pond that has been polluted by run off by the driveways. This chemical degrades photo chemically (via Sun-UV light) as a second order reaction [reaction rate term in mass balance equation -VKC. The 2ndorder k = 0.15 L/mg-day. The pond is completely mixed with HRT, tau (t) equal to 2 days. What is the concentration of k-cide at Ss? 4. BOD is a descriptive parameter that measures the strength of a degradable waste. Untreated waste entering a treatment plant has a [BOD]-200 mg/L. IF the flow rate is 4000 gallons/minute and the degradation rate is 0.29/day, what is the effluent runoff concentration of [BOD] after treatment in a series of two CSTRs as shown below s. Textile industry wastes are to be destroyed in a reactor. The reaction ate is 0.02/min, lf 99% removal is required, determine the size of the Q:500 L/min and Co-800mg/L a) PFR b) CSTR 6. Drugs RUS Pharmaceutical Company uses a batch process to manufacture a new drug. Each batch of material results in 15m3 of liquid waste, containing ethylacetate (commonly use solvent) with a concentration of 14,000 μg. This solvent waste needs to be degraded by a system using UV light and ozone to degrade the solvent. The degradation reaction follows first order kinetics with a rate constant of 4.2/hr. What residence time is required to achieve a fine effluent concentration of 14.0 μg/L before disposal? Ozone is a popular disinfecting agent for drinking water often used in Europe and now, more frequently in the U.S. Dissolved in water, Ozone (Os) degrades rapidly with a half-life of 20 minutes at 20° C. Your consulting firm: Jabar, Blanke and Waters must deliver ozone from an onsite generator to a reaction tank through a 400 foot long pipe. The pipe has an internal width of 24 inches. The flow rate of Os rich water is 150,000 gallons per day. If the water leaving the pipe to the reaction chamber must contain an Os concentration of 1.30 mg/L, what concentration of ozone must be injected into the pipe from the generator (before it travels down the 400 ft delivery pipe)? 7.

Answer 1

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