Water Treatment Questions

• Secondary treatment uses __________ to consume wastes.
• The activated sludge process consists of returning a portion of the clarifier
• Sanitizers used for rubber made equipments are
• BOD stands for
• Which of the following substances are commonly used in a filter?
• Sanitizer used specifically for vitreous enamel are
• The activated sludge process is sometime referred as
• From the following sanitizers which one comes under category of surface active agents?
• The ultimate source of water is
• Zeolite softening process removes both temporary and permanent hardness of water. In this process the calcium and magnesium present in water are precipitated as
• The maximum permissible limit (BIS) of turbidity in drinking water is
• 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
• The maximum desirable limit Bureau of Indian Standards (BIS) of lead in the drinking water is
• When temporary hard water is boiled, one of the substances formed is
• The chemical oxygen demand (COD)measures the
• Hardness of water does not
• Permanent hard water may be softened by passing it through
• Sedimentation is a physical process used in wastewater treatment to
• Biological oxidation processes usually referred as biological treatment, are the most common form of
• Which of the following chemical is sometime added in the process of coagulation and flocculation?