state one advantage and one disadmontage of sewsage sludge
Answers
Answer:
Advantages
Energy Generation
Incineration, also called “mass burn,” utilizes a high temperature furnace that burns any waste. In large treatment plants, high quantities of sludge are used as a source of energy used to produce steam when fed through a turbine. Incineration is more effective when used for combined heat and power (CHP). In a CHP plant, the electricity generated by the hot steam is recaptured and fed through pipelines where nearby facilities can use it for heating.
Disadvantages
Impacts Air Quality
Sewage sludge incineration may impact the surrounding air quality. Combustion of waste materials may result in the production of fine inhalable particles laced with toxic metals. Although the high combustion temperature vaporizes heavy metal compounds, they can condense on the surface of the ash particles. Research has shown that about 78 – 98% of Cadmium (Cd), Chromium (Cr), Copper (Cu), Nickel (Ni), Lead (Pb) and Zinc (Zn) remain in the ash. Fly ash are usually controlled via wet scrubbers, electrostatic precipitators, and bag filters.
DISADVANTAGE
Sewage sludge incineration may impact the surrounding air quality. Combustion of waste materials may result in the production of fine inhalable particles laced with toxic metals.
ADVANTAGE
Low installation cost.
Good quality effluent.
Low land requirement.
Loss of head is small.
Freedom from fly and odor nuisance high degree of treatment.