Most of bacteria in sewage are
Detailed Solution:
Saprophytic bacteria devour dead organic substances, which helps to break down waste into inorganic and organic products. These bacteria play critical role in the treatment of sewage, without this bacteria decomposition may not occur
Pathogenic bacteria is a form of parasitic bacteria manufacture toxins that cause disease in the host organism. source of this bacteria is the excreta of people suffer from dysentery, cholera , typhoid