Your firm is hired to reduce the selenium (Se) concentration of the wastewater e

Question

Your firm is hired to reduce the selenium (Se) concentration of the wastewater efluent from an oil refinery. Information pertinent to the wastewater is listed below Constituent Selenium (ppb) Sulfate (ppm) Chloride (ppm) Nitrate (ppm) Calcium (ppm) Magnesium (ppm) Sodium (ppm) TOC (ppm as C) Alkalinity (ppm as CaCO,) pH Temperature (C) TDS (ppm) Concentration 79-203 210 562 685 728 50 85 117 12~ 16 512 640 99 16 127 245 7.6-8 7.7 31.5 1825 2134 Wastewater flow rate 300 gpm Se limit for the discharge permit -5 ppb (a) Calculate the maximum amount (kg/day) of Se that will need to be removed from the wastewater efluent (b) Use the values of pK, to determine the dominant species of selen HaSe03 Pka a.te, 1,3 H2Se04 - pka, -3, PKA1.9 ent nlan proessing a turbid river water consists of the following physi

Explanation / Answer

waste water flow rate = 300 gpm, which is 1,635,298 liter per day (l/day) (use online convertor)

1 ppm = 1mg/liter and 1ppm= 1000ppb

thus 79 ppb = 0.079 mg/l

and 203 ppb = 0.203 mg/l

permeable limit = 0.005 mg/l

daily discharge of Se = 0.203* 1635298 mgn= 0.33 kg

0.079 * 1635298 =0.13 kg

daily limit = 0.005 * 1635298 = 0.008 kg

maximum removal = 0.33 -0.008 = 0.322 kg

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