Question

Dried………….is used as manure.

Answer 1

Hint: It is human waste (like feces) in wastewater left during sewage treatment. The waste produced is organic in nature, making it suitable for producing biogas and manure. The waste collection is carried out with the help of scrappers and then transferred to a separate tank where anaerobic bacteria decomposes it.

Complete answer:
-Sewage sludge originates from municipal sewage plants that purify the wastewater derived from private households and from the industry.
-It contains the sediment from the mechanical purification steps. Also contains the access biomass from the biological purification steps and also the precipitated phosphate from the third purification step. So these are separated ingredients of the wastewater from different purification steps.
-They have high nitrogen and phosphate contents. That's why it can also be used as a fertilizer in agricultural areas where the burden of pollution is very low.
-Collection of sludge with the scrapper and transfer to a separate tank where the decomposition takes place by anaerobic bacteria.
-It can also be taken as a fuel that is produced in the process of purification. The microbes and human waste settled down after the aerator tank and formed the activated sludge.
-About 97% of water is present in the activated sludge which is removed by sand drying beds or machines.
-After the removal of water, the dried sludge used as a manual helps in providing organic matter and nutrients to the soil.

Additional information:
-The sewage sludge consists of inorganic and organic materials. It also contains large concentrations of plant nutrients and a small concentration of numerous elements and organic chemicals. Some pathogens are also present in the sewage sludge.
-The varieties of digestion techniques can be carried out by treating the sludges. The main purpose behind treating the sludge is to reduce the amount of organic matter and the number of disease-causing microorganisms which are present in the solids.
-Anaerobic digestion, aerobic digestion, and composting are the main treatment options to treat the sewage sludge.
-The organic substance present in the dried sludge increases the fertility of the soil.
So, the correct answer is,” Dried sludge is used as manure”
Note:
-The saving of fossil fuel emissions can be saved by the uses of municipal sewage sludge as fuel.
-Before disposing of, sludge is usually treated to reduce the water content, fermentation propensity, and pathogens.
-All this can be done by making use of different treatment processes such as thickening, dewatering, stabilization, disinfection, and thermal drying.