[3 pts] A water treatment plant consists of coagulation, flocculation, sedimentation, filtration and disinfection. The suspended...
A water treatment plant operator treats 5 million gallons per day (MGD) of a raw surface water with 25 mg/L of Aluminum Sulfate (Al2(SO4)3•16H2O) to remove suspended solids in the water. The untreated water contains 20mg/L total suspended solids (TSS). Assuming that the alum removes all but 2 mg/L TSS, determine the weight of sludge which must be removed each day. Assume: - All of the added aluminum sulfate is converted to its solid hydroxide form (Al(OH)3) and captured in...
Aluminium sulfate (alum) is the most widely used aluminium-based coagulant in water and wastewater treatment. a) Briefly describe how alum (Al2(SO4)3) addition assists in water and wastewater treatment. b) Draw a logC-pH diagram for the aluminium species at equilibrium with Al(OH)3(s). c) For the recipe [Al2(SO4)3] = 2 x 10-3 M, what are the pH and the composition of the system, assuming equilibrium with Al(OH)3(s)? d) For what total concentration(s) (minimum and/or maximum) of Al2(SO4)3 is aluminium entirely soluble? Assume...
How much calcium bicarbonate (kg/day) will need to be added per day in water with alkalinity of 30 mg/L CaCO3 (assume for simplicity only bicarbonate alkalinity is present) if 794 kg of Al2(SO4)3 x18H2O is added per week to treat water with coagulation/flocculation in a water treatment plant with capacity of 1 MGD. Consider the following coagulation/flocculation (unbalanced) reactions occur: Al3+ + HCO3– → Al(OH)3 + CO2
You are assigned to operate a drinking water treatment plant which has a capacity of 280 ML per day. The source water is from a river that contains a high concentration of dissolved organic carbon (DOC), (13 mg L-1) and has a high colour (60 HU) but where the alkalinity changes seasonally. In summer to winter the alkalinity is high (> 100 mg L-1 as CaCO3) and in spring after snow has melted in the mountains and the water flows...
A water treatment plant with an average flow of Q-1,0 m3/s treats its water with alum at a dose of 30 mg/L. Alum coagulation is used to remove particulate matter, reduce the concentration of organic matter, and reduce the alkalinity of the water according to Equation 10-1. If the organic matter concentration is reduced from 10 mg/L to 2 mg/L. determine the total mass of Al(OH)3 removed per day O 708 kad 652 kg/d 674 O 720 kg • If...
2. A dose of 41 mg/L of alum is used in coagulating a turbid water at a water treatment plant treating a flow rate of 32 million gallons per day (mgd). The natural alkalinity of the source water is 10 mg/L (as CaCO3). a. Will the alkalinity be completely consumed in the reaction? If not, then how much alkalinity will be left? If so, then what concentration of caustic soda (NaOH) must be added to avoid a change in the...
10. Write a one-page summary of the attached paper? INTRODUCTION Many problems can develop in activated sludge operation that adversely affect effluent quality with origins in the engineering, hydraulic and microbiological components of the process. The real "heart" of the activated sludge system is the development and maintenance of a mixed microbial culture (activated sludge) that treats wastewater and which can be managed. One definition of a wastewater treatment plant operator is a "bug farmer", one who controls the aeration...