A manufacturer of beef sticks produces a wastewater flow of 2000 m'/day containing 120,000 mg/L salt. It is discharging into a river with a flow of 34,000 m'/day and a salt concentration of 50 mg/L. The regulatory agency has told the company to maintain a salt level of no greater than 250 mg/L downstream of the discharge. a. What recovery of salt must be accomplished in the plant before the waste is discharged? b. What could they do with the recovered salt? Suggest alternatives.

A manufacturer of beef sticks produces a wastewater flow of 2000 m'/day containing 120,000 mg/L salt. It is discharging into a river with a flow of 34,000 m'/day and a salt concentration of 50 mg/L. The regulatory agency has told the company to maintain a salt level of no greater than 250 mg/L downstream of the discharge. a. What recovery of salt must be accomplished in the plant before the waste is discharged? b. What could they do with the recovered salt? Suggest alternatives.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

The DO of a river is 5.9 mg/L just downstream from a wastewater outfall. The mix ofriver and wastewater has a BOD of 25 mg/L. The DOs is 9.2 mg/L and the kd = 0.22 / day. a. estimate the rearation coefficient assuming a river speed of 0.20 m/s and anaverage depth of 3.5 m b. find the critical distance downstream where DO is a minimum c. what percent of BOD has to be removed from wastewater to maintain > 5mg / L DOif it is the only source of river BOD
A 15-mL sample of sewage is mixed with enough dilution water to fill a 300 mL BOD bottle. The bottle has an initial DO of 8.5 mg/L. At the end of 5 days, meausured DO is 2.8 mg/L. Calculate BOD5 of the sewage.
A wastewater treatment plant receives 250 mg/L BOD, 45 mg/L NO3-N, and 0.08% TSS. What is the loading of each component (lb/d) if the plant flow is 730,000 gpd?
A University was opened on 21st March 2021. Due to the high number of students who reported at the main campus, there was waste water dischare into the universities River with dissolved oxygenconcentration of 2.0 mg/l at a discharge rate of 1.10m3/s from the stabilization ponds. After two days, there was another discharge downstream with dissolved concentration of 2.1 mg/l at a discharge rate of 1.20m3/s. After 1 hour a different discharge of waste with dissolved oxygen concentration of 0.5 mg/l at a discharge rate of 1.10m3/s was discharged in the River immediately after the second discharge point. The River that was receiving the waste had initial DO equal to 8.3mg/l, a constant flow of 8.70m3/s, and the temperature of 20' C. The saturated value of dissolved oxygen DOs at 20 ‘C is normally 9.09 mg/l. Just below the point where a continuous first discharge of pollution mixes with a river, the BOD was 10.9 mg/l. Using a deoxygenation constant of 0.20/day, an average flow of the mixture…
Please calculate the ThOD, COD, and ultimate BOD of a wastewater containing (a) 500 mg/L acetate (CH3COOH), which is fully biodegradable; or (b) 500 mg/L oil (C40H80), which is not biodegradable.
A tannery of processing plant with a wastewater flow of 0.011 cu.m/s and a BOD5 of 590 mg/L discharges into the river. The river has a 10 year, 7-day low flow of 1.7 cu.m./s. Upstream of the tannery, the BOD5 of the river is 0.6 mg/L. The BOD rate constants (k) are 0.115 day-1 for the tannery and 3.7 day-1 for the river. Calculate the ultimate BOD of the tannery wastewater, in mg/L. a. 1,972 mg/L b. 2,155 mg/Lc. 1,350 mg/L d. 1,264 mg/Le. None of these
2 A groundwater (Q1 = 5.0 L/s) reaches a point of convergence (mixing) in a river (Q = 1.0 m3/s) where an industrial wastewater discharge (Q2 = 10 L/s) also converges. /s). If the groundwater has ferrous iron with concentration [Fe2+] = 10.0 mg/L, the industrial wastewater has organic matter with concentration TOC = 50 mg/L, determine the COD of the river downstream of the mixing point.
A river with a flowrate (Q) of 850 cfs (cubic feet per second) has a total dissolved solids (TDS, think table salt in water) concentration of 55 mg/L. An industry discharges a water stream with a TDS concentration of 2,500 mg/L into the river and the two streams are well mixed. If the maximum TDS concentration allowed in the river is 250 mg/L, the system is at steady state, and there are no other TDS inputs, answer the following: a) What is the maximum allowable wastewater flow from the industry (in cfs)? b) If the 250 mg/L TDS level is met downstream, what percent of the TDS comes from the industry?
A waste treatment lagoon having 3 cells, each 115,000 m2 in area, a minimum operating depth of 0.6 m, and a maximum operating depth of 1.5 m, receives 1,900 m3/d of wastewater having an average BOD5 of 122 mg/L. What is the BOD5 loading and detention time? The following data applies: the slope of the lagoon walls is disregarded in the calculations. a. 6.7 kg/ha-d, 54.5 daysb. 20.2 kg/ha-d, 163.4 daysc. 18.5 kg/ha-d, 177.6 daysd. 18.5 kg/ha-d, 54.5 dayse. None of these
If a manufacturing facility generates raw wastewater that is predominantly composed of dissolved and suspended solids and with ThOD of 100 mg/L, which of the following treatment equipment you could do away with? Check all that applies.
What is the difference between DO and BOD? Clearly explain why these 2 parameters are used in water and wastewater quality management. Also discuss why DO values are usually low but for some types of water BOD values can be extremely high
A bankrupt chemical firm has been taken over by new management. On the property, they found a 20,000 m3 brine (i.e., salt) pond containing 25,000 mg/L of salt. The new owners propose to flush the pond into their discharge pipe leading to the Pacific Ocean, which has a salt concentration of about 35,000 mg/L (or 3.5% salt). You have been hired by the company to calculate the flow rate (in m3/s) of freshwater (0 mg/L salt) that must they use to reduce the salt concentration in the pond to 500 mg/L within 3 months (90 days). To increase your billable hours, then calculate the total volume of water that was used (in m3) and the mass of salt (in kg) that was exported to the Pacific Ocean. You may assume the pond volume remains the same during the flushing process, the pond is completely mixed, and the salt is a conservative substance.