Which of the following waste disposal tasks are achieved by a septic tank with its dispersion tranch ?
1. Aerobic sluge digestion
2. Settling and anaerobic sludge digestion
3. Anaerobic sewage stabilisation
4. Bio-oxidation of effluent
Select the correct answer using the codes given below :

One stop destination for examination, preparation, recruitment, and more. Specially designed online test to solve all your preparation worries. Go wherever you want to and practice whenever you want, using the online test platform.