B) Chlorine usage in the treatment of 30 MLD of water is 10 kg/day. The residual after 10 minutes contact is 0.12 mg/l. Compute the dosage in mg/l and chlorine demand of water?

Liquid alum is used as a coagulant and specific gravity of alum is 1.33. One gallon of alum weights 6.05 kg and contains 3.22 kg of dry alum. Determine;(a)The alumconcentration (b)What is the volume of liquid alum required in order to prepare a solution containing 20,000 mg/l of alum concentration with final volume of 100 mL? (c)The dosage concentration of 1 mL of stock solution in a 2000 mL Gator jarsample.

In standardization, 10.00 mL of Naz C2 04 solution required 39.17 mL of KMN04. Find the molarity of KMNO,. The unknown required 14.44 mL of MnO,. Find Ca in the urine. (Answer: 1.086 x 10 M, 7.840 x 10 M)

Please include Equations used. This is for water and wastewater engineering

2. You are asked to design a disinfection system with a capacity of 50,000 L/hr to achieve 3 log removal of C. parvum from a water source with a minimum annual temperature of 10 °C. Assume that you will use free chlorine at pH=6 and that you are designing to achieve a chlorine residual of 0.3 mg/L. Specify the total volume required (in m³) for the chlorine contactor and its dimensions (LxWxH in m)

Problem: You are designing a 20 mgd wastewater treatment plant. To characterize the plant's influent solids, the lab used 90 ml samples of the ty[ical wastewater and the following equipment: Solids: Lab Equipment Evaporation Dish Gooch crucible 2.0-micron paper filter 2.0-micron Whatman GF/C filter Lab Measurement Dish + Residue after evaporation 4. Weight 54.2830g 54.2170g 1.5240g 1.6948g 1. The lab placed a sample in an evaporation dish and evaporated it at 105°C finding that the dish weighted 54.3490 g after the dish cooled. What is the concentration (mg/L) of the Total Solids (TS) in the influent?(Ans: TS = 733.3 mg/L) 54.349g 2. If you anticipate a Total Suspended Solids mass loading of 48,400 lb/day at this flow rate, what is the concentration of TSS you anticipate in the influent? What does the analytical scale read? 3. The lab then filtered a sample through a 2-micron filter and evaporated the filter at 105°C, what was the mass of the residue found on the filter paper after it…

please anser 7 and 8

How many gallons of 12-percent sodium hypochlorite solution are needed to disinfect a reservoir 20 feet in diameter and 6 feet deep? An initial chlorine dose of 80 milligrams per liter (mg/L) is expected to maintain a chlorine residual of over 50 mg during the 24-hour disinfection period.

A wastowater sample of 100 ml. was filtered through the filter paper and the filtered wator was collected in a beaker. Based on the information provided in Table 1, calculato total solids, suspended solids, dissolved solids in wastowater (mg/1.). Table 1: Description Weight of filter paper (gm) Weight of tilter paper +solids (gm) after oven dry at 105 'C Weight of filter paper +solids (gm) after oven dry at 105 C Weight of beaker (gm) Weight of beaker + water after oven-dried at 105 "C (qm) Weight 0.05 0.1 7.76 50 51.5 O Suspended solids - 76.6 mg/; dissolved solids 15 mg/ and Total solids 91.6 mg/ Suspended solids 86.6 mg/L; dissolved solids - 15 mg/L and Total solids - 101.6 mg/ Suspended solids - 76.6 mg/L; dissolved solids = 10 mg/L and Total solids - 86.6 mg/L Suspended solids 70.6 mg/L; dissolved solids = 25 mg/L and Total solids = 95.6 mgt.

Problem 8 Given L0,mix=12 mg/L, DO mix=DOsat=11.33 mg/L, kd=0.3 d-1, and kr =0.4 d-1, find the following: (a) Initial oxygen deficit (Do) (b) Critical time on the oxygen sag curve (tc) (c) Critical deficit (Dc)