The waste water of a city has a five day BOD value equal to 160 ppm whereas the allowable vahue for the effluent is 18 ppm. If the daily inflow of waste water is 0.75 MLD and the total loading can be 45 kg per hectare per day, calculate the required area of the oxidation pond.
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- Calculate the ultimate BOD of a waste that has a measured 5-day BOD of 20 mg/L, assuming aBOD rate coefficient of 0.15/day.A waste has an ultimate BOD of 1,000 mg/L and a kL of 0.1/day. What is its 5-day BOD?A river traveling at a velocity of 10 km/day has a dissolved oxygen content of 5 mg/L and an ultimate cBOD of 25 mg/L at distance x=0 km, that is, immediately downstream of a waste discharge. The waste has a cBOD decay coefficient kl of 0.2/day. The stream has a reaeration rate coefficient k2 of 0.4/day and a saturation dissolved oxygen concentration of 9 mg/L. (a) What is the initial dissolved oxygen deficit? (b) What is the location of the critical point, in time and distance? (c) What is the dissolved oxygen deficit at the critical point? (d) What is the dissolved oxygen concentration at the critical point?
- A lagoon with a volume of 1500 ^3 has been receiving a steady flow of a conservative waste at the rate of 100 m^3/day for a long period of time, so assume steady state conditions apply. The waste entering the lagoon has a concentration of 10 mg/L. Assuming complete mix conditions, what would be the concentration of pollutant in the effluent leaving the lagoon? If the input suddenly increases to 100 mg/L due to pollution control failure, what would be the concentration in the effluent from the lagoon 7 days later?Civil, Environmental Laboratory determinations of an industrial wastewater indicate that its ultimate BOD is 750 mg/L and the k value at 20°C is 0.20 day¹. Calculate the 5-day BOD. What would be the 5-day BOD, if k value dropped to 0.1 day ¹?Note: Ultimate BOD=L=L,(a) Calculate the ultimate BOD of a waste that has a measured 5-day BOD of 20 mg/L, assuming a BOD rate coefficient of 0.15/day measured at 20 degrees C. (b) Estimate the rate coefficient if the temperature of the waste is raised to 30 degrees C. (c) What would be the BOD5 at 30 deg. C?
- Suppose a wastewater has a BOD5 equal to 180 mg/L and a reaction rate (k) equal to 0.22/day. Find the ultimate carbonaceous oxygen demand (CBOD).An effluent stream sample (500 mL) from a metal-working facility contains 0.52 g nickel sulphate. (i) What is the nickel concentration of this effluent stream (in mg/L)? (ii) Would you regard this concentration as suitable for discharge to the local sewage system? (iii) How much total nickel (in kg) leaves the facility per year in this stream if ~1 ML of effluent is produced?The discharge from the Renenutet sugar beet plant causes the DO at the critical point to fall to 4.0 mg/L. The Meskhenet Stream has a negligible BOD and the initial deficit after the river and wastewater have mixed is zero. What DO will result if the concentration of the waste(L_w) is reduced by 50%? Assume that the flows remain the same and that the saturation value of DO is 10.83 mg/L in both cases.
- A lagoon with volume of 1200m3 has been receiving a steady flow of a conservative waste at a rate of 100m3/d for a long enogh time to assume steady state conditions. The waste entering the lagoon has concentration of 10.0mg/l. Assume completly mixed conditions. a) What is the concentration of the pollutant in the efluent? b) The input was concentration of is suddenly increased to 100mg/l. Using sprreadsheet, compute and graph the concentration in the effluent over time. Show hand calculation for the effluent concentration 7 days after the change inpute waste concentrationA lagoon with volume 1200 m^3 has been receiving a steady flow of a conservative waste at the rate of 100 m^3/day for a long enough time to assume that steady-state conditions apply. The waste entering the lagoon has a concentration of 10mg/L. Assuming complete mix conditions, if the concentration suddenly increase to 100mg/L, what would the concentration in the effluent be 7 days later (after the sudden increase of input concentration)?A city receives 42 tons per day of a solid waste stream with chemical formula C4H17O to their waste to energy facility each day. Estimate the air requirements to combust this waste in cubic ft per day. Assume specific weight of air is 0.075 lb/cu ft and that air is 21% oxygen by weight.