Consider the following statements with respect to aerobic and anaerobic sewage treatment process.

S1: Biomass production in the aerobic treatment process is less when compared to the anaerobic treatment process.

S2: Energy consumption and production is more in the aerobic treatment process as compared to anaerobic treatment process

S3: Start-up period is less in aerobic treatment process as compared to the anaerobic treatment process.

Which of these statements is/are correct?