$(2$ points$)$ A sewage lagoon that has a surface area of $10,000m^2$ and a depth of $1\mathrm{.}5$ m is receiving

$1500\frac{m^3}{d}$ of sewage containing $150m\frac{g}{L}$ of biodegradable contaminants. At steady state, regulations

require that the effluent from the lagoon must not exceed $20m\frac{g}{L}$ of biodegradable contaminant. Assume

the lagoon is well mixed and that there are no losses or gains of water other than the stated flows. What

is the biodegredation reaction rate for a first order reaction?