An A2O process is operated with a 12 d SRT and achieves an effluent soluble P concentration of 0.5 mg/L, and effluent NO3-N concentration of 5.0 mg/L. The internal and return activated sludge (RAS) recycle ratios are 3.0 and 0.5 respectively. Determine: a) The change in effluent soluble phosphorus and NO3-N concentrations if the internal recycle ratio is changed to 2.8 and RAS ratio is increased to 1.0. (10 pts) b) How much additional rbCOD is consumed by nitrate fed to the anaerobic zone

Achemist wants to extract copper metal from copper chloride solution. the chemist places 0.50 grams of aluminum foil in a solution containing 0.75 grams of copper (ii) chloride. a single replacement reaction takes place. (ii) chloride. a single replacement reaction takes place. which statement explains the maximum amount of copper that the chemist can extract using this reaction? a) approximately 0.36 grams, because copper (ii) chloride acts as a limiting reactant b) approximately 1.8 grams, because copper (ii) chloride acts as a limiting reactant c) approximately 0.36 grams, because aluminum acts as a limiting reactant d) approximately 1.8 grams, because aluminum acts as a limiting reactant

Sodium sulfate dissolves as follows: na2so4(s) → 2na+(aq) + so42- (aq). how many moles of na2so4 are required to make 1.0 l of solution in which the na concentration is 0.10 m?

Nitrogen dioxide decomposes according to the reaction 2 no2(g) ⇌ 2 no(g) + o2(g) where kp = 4.48 × 10−13 at a certain temperature. if 0.70 atm of no2 is added to a container and allowed to come to equilibrium, what are the equilibrium partial pressures of no(g) and o2(g)