solve clearly and step by step.

A 10,000-gal bioreactor operates at a biomass concentration of 2,500 mg/L (as MLVSS) and treats 13,000gal/ day liquid waste that contains an organic contaminant. The suspended solids are separated in a clarifier following the bioreactor with recycle of separated sludge (i.e. your system looks like the one shown in Figure 10-13 below). We know that at least 25 days of solids retention time is required for effective treatment of this waste stream. What is the recycle flow rate if 100gal/ day of the recycled biomass is wasted and the biomass concentration in the clarifier effluent is 20mg/L MLVSS? FIGURE 10-13 Flow and solids balance for system with recycle