List of top Environmental Engineering Questions on Quality and Characteristics of Sewage asked in GATE CE

The theoretical aerobic oxidation of biomass (C₅H₇O₂N) is
\[ \mathrm{C_5H_7O_2N + 5\,O_2 \rightarrow 5\,CO_2 + NH_3 + 2\,H_2O} \]

Given a first-order biochemical oxidation with $k=0.23\, \text{d}^{-1}$ at $20^{\circ}$C (base $e$) and neglecting the second-stage oxygen demand, find the ratio BOD₅ at $20^{\circ}$C to TOC (round to two decimals). 

Atomic weights: C=12, H=1, O=16, N=14 g/mol

The theoretical aerobic oxidation of biomass (C₅H₇O₂N) is
\[ \mathrm{C_5H_7O_2N + 5\,O_2 \rightarrow 5\,CO_2 + NH_3 + 2\,H_2O} \] 

Given a first-order biochemical oxidation with $k=0.23\ \text{d}^{-1}$ at $20^{\circ}$C (base $e$) and neglecting the second-stage oxygen demand, find the ratio BOD₅ at $20^{\circ}$C to TOC (round to two decimals). 

Atomic weights: C=12, H=1, O=16, N=14 g/mol