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

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

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

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

Which of these statements is/are correct?