A river traveling at a velocity of 12 km/day has a dissolved-oxygen content of 5.4 mg/L, and an ultimate CBOD of 32 mg/L at distance x 10 km, that is, immediately downstream of a waste discharge. The waste has a CBOD decay coefficient, ka, of 0.25/day. The stream has a reacration rate coefficient, k., of 0.45/day and a saturation dissolved-oxygen concentration of 9.5 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?

Q: For a wastewater sample, the three-day biochemical oxygen demand at incubation temperature of 20°C…

A: Given data- BOD at 3 days at 20o=200 mg/Lk=0.22 day-1To Find-BOD at 5 days at 20o

Q: If 2% solution of a sewage sample is incubated for 5 days at 20 degrees and depletion of oxygen was…

A: Given data, Percentage of sewage sapmle solution= 2% Dissolved oxygen, At 20°c = 5PPM Bod5=?

Q: A sewage sludge is to be transported a distance of 3 mi through a 12in ID pipeline at a rate of 2000…

A: Given data : Distance = 3 miles Internal diameter= 12 inch Rate = 2000 GPM Yield stress= 35 dyne/cm2…

Q: A wastewater treatment plant discharges 0.1 m3/s of treated wastewater to a river having a mean flow…

A:

Q: In a certain situation, waste water having dissolved oxygen of 2.36 mg/lt is discharged at 1.25…

A:

Q: 13.1 The settled sludge from coagulation of a surface water is 1.5% solids, of which 30% are…

A: The objective of the question is to calculate the specific gravity of the dry solids, the specific…

Q: Estimate the maximum flow of leachate from the bottom of a landfill lined with a 0.2 m thick clay…

A: To estimate the maximum flow of leachate from the bottom of a landfill, we can use Darcy's law.…

Q: A river with a flowrate (Q) of 850 cfs (cubic feet per second) has a total dissolved solids (TDS,…

A: Given, Flow rate of river, Q = 850 cfc= 850 ft3/sec TDS of river, say C =55 mg/L   TDS of discharge…

Q: A chemical waste at an initial SS concentration of 1200 mg/L and flow rate of 250 m3/h is to be…

A:

Q: Answer fast

A: Step 1: The approximate alkalinity of the water sample in mg/L as CaCO3 can be calculated from the…

Q: A river has ultimate BOD of 60 mg/L, a width of 20 m, a depth of 5 m and a flow rate of 9 m3/s. A…

A: The given data is shown below: BOD=60 mg/LWidth=20 mDepth=5mFlow rate=9 m3/sTemperature=20°CUltimate…

Q: A container of Atrazine (500 g) is dumped into a river 2.3 km upstream of a municipal water intake…

A: Given, M = 500 gm or 0.5 kg L = 2.3 km or 2300 m  A = 5.7 m2  Q = 8.25 m3/s D = 0.1 m2/s

Q: Question 4 The DO in an unseeded sample of diluted waste having an initial DO of 9.5 mg/L is…

A:

Q: of a waste discharge. The wa . The stream has a reaeration dissolved-oxygen concentratio en deficit?…

A: Given: V=10 km/day x=0 Km

Q: a landfill contains leachate with a chloride concentration of 2135mg/l. the landfill has a clay…

A: Given Data :

Q: You are the lead engineer on a wastewater treatment plant with a biological reactor. You are…

A: Waste water treatment The process of eliminating contaminants from wastewater and transforming it…

Q: A pollutant entered into a confined aquifer of 5 m thick and porosity 25%. If the seepage discharge…

A:

Q: A river before its entry into a town had a discharge of 200 litres per second and 30 mg/las the…

A:

Q: Estimate the thickness of a clay layer that would be required to limit the flow of leachate from the…

A: To calculate the required thickness of the clay layer, we can use Darcy's Law. given ; flow = 1 mm/d…

Q: You and your team have decided to build an aerated lagoon to treat the waste generated by a local…

A: Given:Q = 40 m^3 / daySo = 250 mg / L , BOD5S = 15 mg / L, BOD5Ks = 100 mg-BOD5 / Lkd = 0.1 d^-1mu =…

Q: The organic carbon content of an industrial wastewater sample is characterized by a COD level of…

A: COD is measure of amount of oxygen in water consumed for chemical oxidation of pollutants.  BOD is…

Q: A reactive chemical disposed of by dilution in a river dissipates at a uniform rate of 0.15 mg/l per…

A: The distance downstream in chemical residual persist is calculated by the following procedure.…

Q: 10 ml of wastewater is diluted to 1 liter, aerated, and sealed. The initial dissolved oxygen level…

A: Given that,Volume of waste water,Vs = 10 mlIt is diluted to 1 liter aerated and sealed.Initial…

Q: A reservoir of liquid waste has a mass of 1200 kg and volume of 0.952 m3. Find its : i. Weight ; ii.…

A: m= 1200 kg V= 0.952 m3 Weight = mg= 1200×9.81= 11772 N Density=m/V =1200/0.952=1260.5 kg/m3

Q: Domestic wastewater has a reaction rate coefficient of 0.3 1/d at 20° C.  The ultimate BOD of the…

A:

Q: BOD is widely used for measuring the concentration of biodegradable organic matters in a wastewater.…

A:

Q: The waste flow 18000m³/day is treated by activated sludge process to reduce 97.5% of influent BOD5…

A: Step 1: Step 2: Step 3: Step 4:

Q: 1. The influent suspended solids concentration to a primary settling tank is 435 mg/L. The average…

A: A primary settling tank (PST)-Influent suspended solids concentrations MLSS (Xt)=435 mg/L=435…

Q: The waste water of a city has a five day BOD value equal to 160 ppm whereas the allowable vahue for…

A: Given: Quantity of waste water = 0.75 MLD                                        = 75 x 105/day BOD…

Q: Dissolved oxygen (D0) is influenced by which factors? Explain. How can you determine chloride…

A: Dissolved oxygen: Dissolved oxygen means the amount of non compound free oxygen present liquid or…

Q: A river before its entry into a town had a discharge of 200 litres per second and 30 mg/las the…

A: Discharge = 200 l/sconcentration = 30 mg/lwastewater discharge = 250 mg/lconcentration = 75 mg/lTo…

Q: 9. The food processing waste discharge causes an oxygen sag in a stream, with minimum DO of 2.0…

A: Given data:

Q: A food plant discharge of BOD causes oxygen sag curve to have a minimum of 6.5 mg / L. If the BOD…

A: The given data is shown below: Minimum DO=6.5 mg/LSaturated DO=9 mg/LInitial oxygen deficit=0 mg/L

Q: A stream carries a flow of 700 m3 /day with TDS concentration of 650 mg/l. At a point, 35 m3 /day of…

A:

Q: If 2% solution of a sewage sample is incubated for 5 days at 20 degrees and depletion of oxygen was…

A: given- 2% solution5 days incubation at 20 degreesdepletion of oxygen=5 ppm

Q: Poorly treated municipal wastewater is continuously discharged directly into a lake. The discharge…

A: The pollutant balance equation for the steady-state is: In-out-Decomposed=0  Also Accumulation=0

Q: a landfill contains leachate with a chloride concentration of 2135mg/l. the landfill has a clay…

A: Given Data:

Storm Sewers and Detention

The storm drains system transports rainwater or stormwater and other runoff from roads, parking lots, and roof downpipes directly to nearby creeks, rivers, or the sea without any treatment.