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lyricist of jollity

lyricist o.

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INSTANT ANSWER

A long narrow RO membrane channel (cross flow) is used to treat brackish water of 5000 mg/L TDS. The recovery of the membrane channel is 75% at driving pressure is 2.0×106 Pa. (a) Determine the characteristic pressure of the membrane channel (b) Calculate the recovery of the process if the process is under thermodynamic restriction.

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ANSWERED

Chareen Guzman verified

Numerade educator

what is the molar volume of water at stp

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INSTANT ANSWER

salicylic acid/sodium salicylate is an acid/conjugate base pair which can be used to adjust the pH of environmental systems. In this case, it is proposed that salicylic acid be used to adjust the pH to minimize the amount of free Pb2+. If salicylic acid is added to the point where the total acid concentration in the lake is 10-2 M, what would the pH of the lake be. Note for this question, please only consider this acid in the lake and ignore any potential effects to fish/wildlife. Please solve this question using an algebraic approach, clearly stating all assumptions, and checking any assumptions you make. Note, you may create a pC-pH diagram to check your response, but you must clearly show all algebraic calculations for full credit

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INSTANT ANSWER

Dissolved Pb (+II) in the lake after the spill can react with oxygen, to form Pb (+IV). Assuming that oxygen is the redox couple for the oxidation of Pb (+II) to Pb (+IV) what are Log K, Peo , Peo 7, Eo and Eo 7 for the overall oxidation of Pb (+II) to Pb (IV). Note assume Pb (II) is Pb+2 and Pb(IV) is PbO2

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Type ) A truck driver carrying a load of lead nitrate (Pb(NO3)2) lost control of his semi- truck after hitting a patch of ice and crashed the truck into Blue Lake, which was right next to the highway. Despite the best efforts of the emergency workers, several of the crates containing lead nitrate were damaged, and the highly soluble compound dissolved immediately. Assuming the lake is initially at circumneutral pH (7), and that the spill resulted the in a total lead concentration of 10-3 M within the lake. Based on the following information, will PbO(s) precipitate out of Blue Lake. Assume all lead nitrate dissociates into Pb+2 and NO3-, no other sources of lead exist in the lake and that no other reactions besides the equations shown below occur. PbO(s) + 2H+ ⇌ PbO(s) + H+ ⇌ PbO(s) + H2O ⇌ PbO(s) + 2H2O ⇌ Pb2+ + H2O PbOH+ + H2O Pb(OH)2o Pb(OH)3- + H+ logKs0/ksp logK1 logK2 logK3 = 14 = 3.4 = -0.5 = -12. question here (Keep it short & clear to get the best answer)

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INSTANT ANSWER

You have a waste stream influent that contains 3 percent total solids (TS) of which 75% is volatile solids (TVS) and 1.5 percent of the TS is total nitrogen (TN). The copper content in the solids is 2500 mg/kg of dry solids. The EPA 40CFR503.13 rules state that the ceiling cumulative concentration allowed is 4300 mg/kg while the monthly average is 1500 mg/kg. The annual maximum loading rate is 75 kg/ha annually. If the quantity of sludge produced is 1000 kg/d (dry basis), what land area is required to apply this sludge if corn (yielding 150 bu/ac) is the crop grown on this land?

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ANSWERED

Jennifer Stoner verified

Numerade educator

When designing the land application of sludge you have a maximum one-time application and a maximum life-time application. In addition, the maximum application that can be designed will be based upon the limiting constituent contained within the sludge. Knowing that information, one can design the LA system, but what other consideration must be made by you as the designer to insure the safety for your clients and anyone else around the application site?

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ANSWERED

Jennifer Stoner verified

Numerade educator

An engineer came to you to discuss their design of his application rate for a land application system and wanted your input. During the discussion and showing you the water balance as described by the TCEQ method that the maximum application rate prescribed during one month (August, 31 days) was 8 inches and they were using a center pivot irrigation system that covers 180 acres, which covers both the crop water requirements and leaching. They informed you that the pumping system was quite good in that it could supply 800 gallons per minute to the irrigation system. How would you respond to this engineers’ design numbers?

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INSTANT ANSWER

As the newest expert in designing slow rate land treatment systems for a client who wants to maximize their crop produciton, you are asked to analyze the system that is used for the City of Sara Lee, Texas (South-Central Texas) where the average relative humidity is near 65%, yet evapotranspiration exceeds precipitation by over 35 inches per year. The original designer allowed the use of alfalfa, corn/wheat rotation, and sorghum as the crops for the system. The total nitrogen concentration of the wastewater is 27 mg/L and the total dissolved solids concentration is 1,200 mg/L. The method of calculating evapotranspiration was the Blaney-Criddle equation and the determination of the storage volume required was with the TCEQ method where the leaching was determined to be 15%. An average irrigation efficiency of 75% was used for a system consisting of 60% center pivots and 40% furrow irrigation. The furrow irrigation fields vary in length from 1/8 to 3/8 mile with a slope of between 1 and 2.5 percent. The maximum application rate for wastewater on the land was set at 52 inch/year in the old design. The current level of wastewater application being requested is 70 in/year. As the expert witness on the stand in front of the general public, explain whether or not the old system was adequately designed and whether or not the requested application should be granted – providing an explanation to your analysis on the necessary components of the system to prove your point.

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INSTANT ANSWER

You have sludge produced at a rate of 5 dry tons/day at a wastewater treatment plant that you plan to apply to land. The sludge contains 100 mg/kg dry weight of Nickel that is the land limiting constituent. The land area (acres) required for applying this sludge if applied for a total of 30 years tp a soil that is a sand-clay-loam is most nearly: A. 10 B. 20 C. 30 D. 40

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