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Sludge treatment and disposal MCQs Civil

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1. Sludge is mainly produced in:




2. The main purpose of sludge thickening is to:




3. Gravity thickening is based on:




4. Sludge digestion is primarily used for:




5. Anaerobic digestion of sludge produces:




6. Aerobic digestion requires:




7. Sludge dewatering aims to:




8. Common methods for sludge dewatering include:




9. Lime stabilization of sludge:




10. Sludge drying beds work by:




11. Centrifugal dewatering separates sludge by:




12. Anaerobic digesters are usually operated at:




13. Stabilized sludge is safer for:




14. The term “biosolids” refers to:




15. Thermal drying of sludge is used to:




16. Sludge incineration is mainly for:




17. Dewatered sludge is often stored in:




18. Thickened sludge has a typical solids content of:




19. Sludge holding tanks are used to:




20. Alkaline stabilization of sludge is done using:




21. Mechanical dewatering is preferred over drying beds when:




22. The retention time in anaerobic digesters is typically:




23. Pathogen reduction in sludge can be achieved by:




24. Thickened sludge is usually pumped to:




25. Landfilling of sludge requires:




26. Sludge from chemical treatment processes may require:




27. Dewatering using belt filter presses involves:




28. Sludge lagoons are designed for:




29. Digesters reduce sludge volume primarily by:




30. The main environmental concern in sludge disposal is:




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