5. A textile dyeing factory produces effluent containing Zn2+, Ag+, and Cd2+ at concentrations of 30, 10, and 40 mg/L, respectively. The wastewater flow rate averages 350 m3/d. An ion exchanger with a capacity of 2.50 meq/g is to be used to remove these metals before discharge of the waste to the sewer. The exchange capacity of the resin on a volumetric basis is 1.5 meq/L. The regenerant solution will be HCI at a concentration of 40 g/L. a. What is the volume of the ion exchanger and mass of resin that is needed to remove these ions if the resin is to be regenerated once per month? b. What is the volume of regeneration using every month?
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- 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 = 4/1The BOD5 of the raw Divy Zeya Residential, London wastewater is 225 mg/L. A long term BOD test has revealed that this wastewater also has an ultimate carbonaceous BOD of 325 mg/L. Plant effluent testing has shown that the BOD5 drops by 92% across the plant. Long term tests on the effluent also show that the BOD decay coefficient is half the original value in the raw wastewater. Calculate the BOD decay coefficient of the raw wastewater and the ultimate carbonaceous BOD of the effluent wastewater.Question 1. A 200 L/d wastewater flow containing only unbiodegradable soluble and particulate organics is fed to a 35L activated sludge reactor, the waste flow from which is 5.83L/d. If the filtered and unfiltered COD concentrations of influent are 45 and 475 mg COD/L respectively, what is the VSS concentrations in the reactor if the COD/VSS ratio of the particulate organics (fcv) is 1.481 mgCOD/mgVSS? And check the COD mass balance over the system. Qw=5.83 L/d Qi=200 L/d 35 L COD=45 L/d (USO) Sti=475 L/d X, UPO+USO
- A wastewater treatment plant has been operating with the following specifications:flow rate = 7,630 m3/d, aeration tank volume = 1,270 m3, mixed liquor volatile suspendedsolids = 2,600 mg/l. The soluble BOD in the plant influent used to be 133 mg/l, but hasrecently changed to 222 mg/l. What is the new MLVSS this plant should use to maintain thesame F/M ratio as before? (Ans. Xnew = 4,340 mg MLVSS/l)5 ml wastewater is added to a 333 ml BOD flask. The initial dissolved O2 concentration was 13 mg/l and final dissolved O2 concentration was 4 mg calculate the BOD?The ABC Citizens Waste Water Treatment Plant uses ferric chloride. a) What is it used to remove from the wastewater?b) In which process is the ferric chloride added?
- Q-ASP is used to treat a waste water flow of 2MLD having BOD5 of 250 mg/lit. The biomass concentration in the aeration tank is 2500 mg/lit and the concentration of biomass leaving the system is 80 mg/lit, the aeration tank has a volume of 200m³. Find the sludge age.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 nitrogen concentrations in the mixture. The ratio of flow rate is domestic/textile = 4/1As an operator of a wastewater treatment facility, you have learned that your plant runs well at an SRT (based on MLVSS (X) in the aeration basin) of 12 days. If today’s MLVSS (X) concentration is 2,700 mg/L and the RAS (Xr) concentration is 5,500 mg/L, how many L of sludge should you waste from the secondary clarifier today? Other design conditions: Average influent flow = 12,000 m3/d Influent soluble BOD = 150 mg/L Required effluent TSS = 30 mg/L Aeration tank Volume = 1,000 m3
- Problem 6. A new manufacturing facility is being located in your town. It plans to produce 2,000 m³/day of a wastewater that consists primarily of water and the chemical phenol dissolved in it at a concentration of 5 mg/L. Phenol has a chemical formula of C,H5OH. The company has asked the municipal wastewater treatment to consider treating this industrial waste. Your plant currently treats 30,000 m³/day with an average influent of 350 mg COD/L. a) Estimate the increase in COD loading (kg COD/day) if you accept the industrial waste discharge? b) Estimate the additional amount of oxygen (in kg O2/day) needed to oxidize the phenol at the treatment plant.The wastewater from a manufacturing treatment plant is discharged to a municipal 'treatment plant for processing with domestic wastewater. The characteristics of the wastewater from the manufacturing treatment plant are 3500 mg/l BOD, 4500 mg/l SS, 70 mg/l nitrogen and 2 mg/l phosphorous. The characteristics of the domestic wastewater are 350 mg/I BOD, 285 mg/I SS, 50 mg/lN and 11 mg/I P. If the required BOD/N/P weight ratio is 100/5/1, what is the minimum quantity of domestic wastewater required per 1000 gallons of manufacturing wastewater to provide adequate nutrients for biological treatment and the concentration of SS in the combined wastewater?The plant operators at the Acme WWTP maintains the 10,000 gal aeration basin shown below with a constant 1500mg/L mixed liquor suspended solids (MLSS). The suspended solids are separated in a clarifier with recycle of the separated sludge. The recycle flow rate is 5,000 gal per day and 500 gal of recycle are wasted daily. Given that the plant treats 25,000 gals of liquid waste per day and the effluent contains 30 mg/L MLSS, find the solids retention time assuming the system is at steady-state.