A wastewater treatment plant serves 5,000,000 people. Each person on the average produces 0.1m^3 per person...

A wastewater treatment plant serves 5,000,000 people. Each person on the average produces 0.1m^3 per person per day of wastewater. If the ultimate BOD of the discharge from the plant is 50 mg/L into a 5-meter deep stream that has an average flow rate of 10m^3 per second, a velocity of 1 meter per second, and a BOD value of 5 mg/L. The deoxygenation constant Kd is 0.19/day, and DO at the mix point is 8.5 mg/L. The water temperature is at 20 degrees Celcius and DO5=9.1 mg/L.

What would be the time and distance needed to reach DOmin in the stream?

Solutions

Expert Solution

Ally Wells answered 2 months ago

Next > < Previous

Related Solutions

A wastewater treatment plant, which serves a population of 300,000 people, receives an average daily volume...

A wastewater treatment plant, which serves a population of 300,000 people, receives an average daily volume of 24 million gallons per day (MGD) at an average influent 5-day biochemical oxygen demand concentration of 200 mgBOD5/L and an average influent total suspended solids concentration of 220 mgTSS/L. The plant operates a primary sedimentation process that remove 65% of the incoming TSS and 35% of the incoming BOD5%. This process is followed by a secondary treatment process before discharge to the local...

Wastewater Engineering: Find out which water treatment plant serves your home, draw a diagram including each...

Wastewater Engineering: Find out which water treatment plant serves your home, draw a diagram including each of the main components of the process. Describe the objective of each of the individual components.

Consider the design of a wastewater treatment plant (WWTP) for a community with average daily and...

Consider the design of a wastewater treatment plant (WWTP) for a community with average daily and peak hourly wastewater design flows of 7570 m3/day and 18925 m3/day. The raw sewage has an average of 240 mg/L BOD5 and 270 mg/L of suspended solids. (a) Assume that the primary sedimentation process removes 55% of the suspended solids and 35% of the BOD5 of the raw sewage. Determine the SS and BOD5 concentrations in the primary sedimentation effluent flow. (1 mark) The...

A wastewater treatment plant that treats wastewater to secondary treatment standards uses a primary sedimentation process...

A wastewater treatment plant that treats wastewater to secondary treatment standards uses a primary sedimentation process followed by an activated sludge process composed of aeration tanks and a secondary clarifiers. This problem focuses on the activated sludge process. The activated sludge process receives a flow of 15 million gallons per day (MGD). The primary sedimentation process effluent has a BOD5 concentration of 180 mgBOD5/L (this concentration is often referred as S). Before flowing into the activated sludge process, the primary...

A municipal wastewater treatment plant discharges 20,000 m3/d of treated wastewater to a stream. The wastewater...

A municipal wastewater treatment plant discharges 20,000 m3/d of treated wastewater to a stream. The wastewater has a BOD5 of 30 mg/L with a k1 of 0.23 d-1. The temperature of the wastewater is 20 oC, and the dissolved oxygen is 2.0 mg/L. The stream just above the point of wastewater discharge flows at 0.65 m3/s, has a BOD5 of 5.0 mg/L, and is 90% saturated with oxygen. The temperature of the stream is also 20 oC. After mixing, the...

Your task is to build a wastewater treatment plant to handle all of the domestic wastewater...

Your task is to build a wastewater treatment plant to handle all of the domestic wastewater produced by a housing estate. Using population equivalent, PE = 65000, design, describe and calculate briefly the sizes of all the unit processes in the treatment plant that are going to be built. You may assume the value that is not given.

A municipal wastewater treatment plant is designed for COD removal and nitrification. The wastewater characteristics and...

A municipal wastewater treatment plant is designed for COD removal and nitrification. The wastewater characteristics and kinetic coefficients are described in the table below. The aeration tank DO concentration is 2.0 mg/L and MLSS concentration is 2500 mg/L. The temperature is 15C. Assume that the concentration of influent NH4-N that is nitrified accounts for 80% of influent TKN. Calculate the following parameters as a function of SRT (i.e., derive mathematical expressions of the following parameters as a function of SRT,...

Your task is to build a wastewater treatment plant to handle all of the domestic wastewater...

A new wastewater treatment plant was built to treat the wastewater flow 800,000 gpd. The capital...

A new wastewater treatment plant was built to treat the wastewater flow 800,000 gpd. The capital cost to build the wastewater treatment plant was $6,000,000. The annual operation and maintenance costs of operating the plant is $700,000/year. Estimate the cost of treating 1000 gallons of wastewater ($/1000 gallon). Assume the design life as 20 years and interest rate of 4%.

The total flow at a wastewater treatment plant is 682 m3/day. The purpose of the plant...

The total flow at a wastewater treatment plant is 682 m3/day. The purpose of the plant is to remove compound Z from the wastewater by treating it in reactors, using a newly developed microbial process. Assume the microbial treatment can be modeled as a first order reaction with a rate coefficient of 0.36/h. Suppose the flow is split evenly and treated in two parallel reactors– one complete mix and one plug flow -- each with a volume of 88 x...

Subjects