Question

answer this questions

Answer 1

1. It helps in reducing the problem of waste handling as the hazard level is reduced to desired level so it can be handled and disposed of safely without creating any damage to environment and people as well.

2. Sedimentation is usually preceded by treatment using bar screens and grit chambers to remove large objects and coarse solids.

3. Effluent polishing is a process to improve the quality of effluent produced by a sewage treatment system.

4. Floc is a loosely clumped mass of fine particles.

5. Sludge is a thick, soft unpleasant substance.

Answer 2

1) The major aim of wastewater treatment is to remove as much of the suspended solids as possible before the remaining water , called effluent , is discharged back to the environment . As solid material decays , it uses up oxygen , which is needed by the plants and animals living in the water .

2) A sedimentation tank allows suspended particles to settle out of water or wastewater as it flows slowly through the tank , thereby providing some degree of purification . A layer of accumulated solids , called sludge , forms at the bottom of the tank and its periodically removed .

3)Effluent polishing is a process to improve the quality of effluent produced by a sewage treatment system . The produces a purity of effluent normally accepted by the Environment Agency for direct discharge into the environment, including the sea , rivers , lakes , etc .

4) A floc is a type of microbial aggregate that may be constituted with biofilms and granules , or else considered a specialized type of biofilm . Flocs appear as cloudy suspensions of cells floating in water , rather than attached to and growing on a surface like most biofilms .

5) Sludge is a semi - solid slurry that can be produced from a range of industrial processes , from water treatment , wastewater treatment or on - site sanitation systems .