Q. Secondary treatment uses __________ to consume wastes.

View solution

Q. Temporary hardness of water is caused by the presence of

View solution

Q. Zeolite used in zeolite softening process for the treatment of hard water gets exhausted after certain time of usage but can be regenerated by flushing it with

View solution

Q. Permanent hard water may be softened by passing it through

View solution

Q. Hardness of water does not

View solution

Q. Which of the following chemical is sometime added in the process of coagulation and flocculation?

View solution

Q. Acid used mostly for removal of milk stone is

View solution

Q. According to BIS the maximum permissible limit of dissolved solids in drinking water is

View solution

Q. Permanent hardness of water is caused by the presence of

View solution

Q. Application of quaternary ammonium compounds as sanitizing agents tends to

View solution

Q. The maximum desirable limit (BIS of mercury in the drinking water is

View solution

Q. Temporary hardness of water may be removed by adding

View solution

Q. Lagoons may be characterized as

View solution

Q. Both temporary and permanent hardness of water can be removed on boiling water with

View solution

Q. Permanent hardness of water may be removed by the addition of

View solution

Q. The methods used for biological treatment are

View solution

Q. Zeolite softening process removes both temporary and permanent hardness of water. In this process the calcium and magnesium present in water are precipitated as

View solution

Q. When temporary hard water is boiled, one of the substances formed is

View solution

Q. BOD stands for

View solution

Q. The activated sludge process is sometime referred as

View solution