The suspended solids concentration of the primary influent is $$ 305 \mathrm{mg} / \mathrm{L} $$ and that of the primary effluent is $$ 128 \mathrm{mg} / \mathrm{L} $$. How many kilograms of dry solids are removed in the primary settling tank the flow is $$ 0.16 \mathrm{~m}^{3} / \mathrm{s} $$ ? A. $$ 2,000 \mathrm{~kg} / $$ day B. $$ 2,447 \mathrm{~kg} / $$ day C. $$ 2,750 \mathrm{~kg} / $$ day D. $$ 1,500 \mathrm{~kg} / $$ day

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1. Determine the difference in suspended solid concentrations between the influent and effluent:
   $$
   \Delta C = 305 \, \mathrm{mg/L} - 128 \, \mathrm{mg/L} = 177 \, \mathrm{mg/L}
   $$

2. Convert the flow rate from $$\mathrm{m^3/s}$$ to $$\mathrm{L/s}$$ (since $$1 \, \mathrm{m^3} = 1000 \, \mathrm{L}$$):
   $$
   Q = 0.16 \, \mathrm{m^3/s} \times 1000 \, \mathrm{L/m^3} = 160 \, \mathrm{L/s}
   $$

3. Calculate the mass of solids removed per second in mg:
   $$
   \text{Mass removal rate (mg/s)} = \Delta C \times Q = 177 \, \mathrm{mg/L} \times 160 \, \mathrm{L/s} = 28320 \, \mathrm{mg/s}
   $$

4. Convert the mass removal rate from mg/s to kg/day:
   $$
   \text{First, convert mg/s to kg/s:} \quad 28320 \, \mathrm{mg/s} = 28.32 \, \mathrm{g/s} = 0.02832 \, \mathrm{kg/s}
   $$
   $$
   \text{Then, convert kg/s to kg/day:} \quad 0.02832 \, \mathrm{kg/s} \times 86400 \, \mathrm{s/day} = 2446.85 \, \mathrm{kg/day}
   $$

5. Rounding to the nearest whole number, the solids removed per day is approximately:
   $$
   2447 \, \mathrm{kg/day}
   $$

Thus, the correct answer is:

B. $$2,447 \, \mathrm{kg/day}$$
Approximately 2,447 kilograms of dry solids are removed each day.

The suspended solids concentration of the primary influent is and that of the primary
effluent is . How many kilograms of dry solids are removed in the primary settling tank
the flow is ?
A. day
B. day
C. day
D. day

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The suspended solids concentration of the primary influent is and that of the primary effluent is . How many kilograms of dry solids are removed in the primary settling tank the flow is ? A. day B. day C. day D. day