Two industries Fuzzy Chemicals and Super Agra want to discharge their wastewater into the Delaware River (upstream flow of Q3) through a single channel. Fuzzy Chemicals has a flow of 2 MGD (Q2) and a phenol concentration of C2 while Super Agra has a flow of 20 MGD (Q1) with a phenol concentration of C1. The phenol concentration upstream of the factories is negligible. What is the correct expression to determine the phenol concentration C just downstream of the factories? O C= (Q1C1 + Q2C2) / (Q3) C= (Q1C1 + Q2C2 + Q3(C1+C2) / (Q3+Q1+Q2) O C= (Q1C1 + Q2C2) / (Q3+Q1+Q2) O C = (C, + C2) * (Q1+Q2) / (Q3+Q1+Q2)

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?

Only find the BOD of the mixture.

3. A hard drive manufacturer uses Nickel to plate its disks and then polishes them, resulting in a concentration of 50 mg/l in their 50,000 gallons per day wastewater stream. Their industrial permit standard for Ni discharge into the sewer system and treatment plant is limited to 0.2 Ibs./day. What percentage of the mass of Nickel must the onsite treatment system remove to be in compliance with the discharge standard? Use the following formula to determine the daily Nickel loading of the manufacturing system: Loading (Ibs/day) = Conversion Factor (8. Flow(MGD)

Working for the local wastewater treatment plant, you are asked by the labtechnician to help her set up BOD5 tests. The issue here is what dilution to use to get the BOD5 test to give an acceptable result. Of course, you do not know the actual BOD5 value, but you are able to determine from past tests that the total ultimate BOD (NBOD + L0) of the wastewater is546 mg/L and the organic Nitrogen (TKN) concentration of the wastewater is 32 mg N/L. You also know that the first order rate constant for the BOD test is 0.25 day-1. When you ask, the technician tells you that the normal DO concentration at the start of the test is 8.3 mg/L.Based on all this information, tell the lab technician which of the following wastewater sample volumes added to a standard BOD test bottle (300 mL) is going to produce an acceptable final result: 1 mL/3 mL/9 mL/30 mL/90 mL NOTE: Acceptable BOD test should comply with the two essential criteria: DOfinal ≥ 2 mg/L and DOinitial – DOfinal ≥ 2 mg/L.

A metal plating industry produces effluent containing Cu2+, Fe2+, and Ni2+ at concentrations of 25, 25, and 35 mg/L, respectively. The wastewater flow rate averages 290 m3/d. An ion exchanger with a capacity of 3 meq/g is used to remove these metals before discharge of the waste to the sewer. The exchange capacity of the resin on a volumetric basis is 2.0 meq/L. What is the volume of the ion exchanger and the mass of resin in it to remove these ions if the resin is to be regenerated once per week?

The wastewater from a synthetic textile manufacturing plant is discharged to a municipal treatment plant for processing with domestic wastewater. The characteristics of the synthetic textile wastewater are 1500 mg/L BOD, 2000 mg/L SS, 30 mg/L nitrogen, and no phosphorus. The characteristics of the domestic wastewater are 200 mg/L BOD, 240 mg/L SS, 35 mg/L nitrogen, and 7 mg/L phosphorus. Find the BOD, SS of the mixture. The ratio of flow rate is domestic/textile = 4/1

A PFR is designed to treat incoming waste water containing 7.33 mM of H2S at a flow rate of 100 liters/min. The observed removal rate constant is 0.003 L/mg/hr. 90% removal is required. What is the order of the observed reaction rate? What is the necessary retention time? What is the necessay reaction volume in m3?

2. For an industrial wastewater activated sludge process, the amount of bsCOD in the influent wastewater is 300 g/m³ and the influent VSS concentration is 50 g/m³. The influent flowrate is 1,000 m³/d, the biomass concentration is 2,000 mg/m³, the reactor bsCOD concentration is 15 g/m³ and the reactor volume is 105 m³. Determine the net biomass yield (gVSS/g bsCOD), assume that maximum specific substrate utilization rate is 5 g/(g*day), half velocity constant is 40 mg/L bsCOD, endogenic decay coefficient is 0.1 gVSS/(g VSS d)

Calculate the value of SS of the misxture.