1.3, tank width -8 m, the moisture content of the sludge is 95% and the concentration of suspended A rectangular sedimentation tank removes 80% of 0.06 mm diameter particles with SG= solids in the effluent flow is 200 mg/L, detention time 2 hrs for discharge 15000 m³/day. Determine the following: a) Dimension of the tank. Surface over flow rate b) Maximum horizontal velocities keep particles in settling d) The depth of sludge in the basin if its cleaning is daily

1.3, tank width -8 m, the moisture content of the sludge is 95% and the concentration of suspended A rectangular sedimentation tank removes 80% of 0.06 mm diameter particles with SG= solids in the effluent flow is 200 mg/L, detention time 2 hrs for discharge 15000 m³/day. Determine the following: a) Dimension of the tank. Surface over flow rate b) Maximum horizontal velocities keep particles in settling d) The depth of sludge in the basin if its cleaning is daily

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Determine the area required for solids thickening in a clarifier receiving 1,500 m³/s of influent with a solids concentration of 800 mg/Lif the underflow concentration 12,000 mg/L. The settling flux curve for the sludge is provided below. Also determine the limiting flux JL, the limiting solids concentration CL, and the underflow rate Qu. Solids flux, kg/m²-h 12 10 8 6 4 2 0 0 5 BAT 10 Solids concentration, kg/m³ = g/L 15
The characteristics of primary and secondary settling units of activated sludge process is given below. Design a gravity thickener for the combined mixture of sludge from both tanks. Assume the solid loading rate is 40 kg / m².d. The specific gravity of combined sludge is 1.02 and provide two circular thickeners. Type of sludge Primary settling unit Secondary settling unit Specific gravity (assumed) 1.03 1.005 Solid % 2.5 0.6 Flow rate (m'id) 140 350
Design a rectangular sedimentation tank treating 2.5×106litre/day. The size of tank is 17.5 × 5.5 × 3.5 m. if 80 ppm suspended solids are present in the water, assuming 75%removal in the basin and the average specific gravity as 2.0, determine: i) Average flowof water through tank ii) Detention time iii) Deposition of the solids in the tank iv) Overflow rate
Q2: A column analysis for an activated sludge suspension yielded the following: MLSS Conc (mg/l) Settling velocity m/h 1000 2.8 2000 3000 1.2 0.4 4000 0.2 5000 Question 0.1 6000 0.06 The influent MLSS concentration is 2000 mg/l and the flow rate is 4200 m³/d. Determine the size of the clarifier that will thicken the solids to 8000 mg/l.
2. (a) Design a gravity thickener to concentrate the mixture of sludge obtained from primary and secondary settling units in an activated sludge wastewater treatment plant. Make appropriate assumptions in your calculations. Sludge waste flow rate in the primary settling unit= 140 m³/d; and concentration = 2.5% Sludge waste flow rate in the secondary settling unit= 350 m/d; and concentration = 0.6% Qi ci Solids Loading Rate (SLR) = 40 kg ds / m².d, and SLR : A ci Qi Tc Expression for thickening zone depth= 0.75Cu A Ci: Incoming mixed sludge concentration Qi: Incoming mixed sludge flow rate A: Cross section area of the thickening tank Cu: Target underflow concentration (=5%) Tc: Time in compression zone (=2 days)
Reclangular Sedimentation tank is designed for a new water treatment wth design flow of J0 million liters per day Using 2:1 length width ratio and overflow rate 24 m/m². d. Tank is 2m deep. Determine the final des ign for the tank and evaluate the detention time-
A circular secondary clarifier will be used to treat an average daily flow (ADF) of 6,000 m3 /d from a high-purity oxygen activated sludge process with a MLSS concentration of 8,500 mg/L. The RAS flow is 2,500 m3 /d. Key design criteria include an overflow rate of 15 m3 /(d.m2 ) and a solids loading rate of 100 kg/(d.m2 ). Determine the minimum diameter (m) of the clarifier to achieve these criteria.
A rectangular settling basin has a depth of 3 m, a length of 40 m and a width of 6 m. The water treated in the basin has a flow rate of 500 L/s and contains 50 mg/L of type a particles, 100 mg/L of type b particles and 180 mg/L of type c particles (particle type letters refer to the particles listed in problem 1). What is the suspended solids concentration in the effluent from the settling basin? Determine the overall percent removal of suspended solids from the water achieved by the settling basin.
9-2. A flow of 20,000 maay which contains 100 mg/L of suspended solids is coagulated with 50 mg/L of alum. If 90 percent of the solids and chemical precipitates is removed in sedimentation estimate: (a) Total dry mass of sludge produced per day. (b) Total wet mass produced per day, assuming the sludge is 5 percent solids by weight. (c) Total volume produced per day, assuming the specific gravity of the wet sludge is 1.05.
Determine the underflow volume of sludge wastage
(a) A groundwater borehole at USM engineering campus contains 3000 mg/L of TDS. The flow is 0.32 m3 /s. The design TDS concentration of the product water is below 400 mg/L. The net pressure is 40 atm. The membrane manufacturer provides that the membrane has a water flux rate coefficient of 2.2 x 10-6 s/m and a solute mass transfer rate of 1.5 x 10-6 m/s. Calculate the membrane area required for the RO system. (B) A water treatment at Nibong Tebal receiving a raw water contains a concentration of 0.5 µg/m3 atrazine from Kerian River. In order to comply with the drinking water quality guideline, the treatment plant should reduce the concentration of Atrazine to 0.1 µg/L. If the dosing of powdered activated carbon have been applied before the coagulation, calculate the minimal dose of PAC in mg/m3 .