Comparison of the design criteria of 141 onsite wastewater treatment systems available on the French market

SGS design parameters range from 0.025 to 0.34 kg BOD5 per kg MLVSS/d with hydraulic retention times of 0.28-3.7 d. For clarifier design, water velocity ranges from 0.15 to 1.47 m/h. In the sludge line, sludge storage volume ranges from 0.125 down to just 0.56 m3/PE.