1. Decay of organic wastes: Many saprotrophic bacteria act as natural scavengers by continuously removing the harmful organic wastes from man's environment. .
2. Sewage disposal : Ability of anaerobic bacteria to purtrify the organic matter is used in sewage disposal system of cities. The common bacteria involved in sewage disposal are - Coliforms, Streptococci, Clostridium etc.
3. Role in improving soil fertility: Saprotrophic bacteria present in soil perform various activities for their survival. Some of these activities improve the fertility of soil by formation of humus, manure, etc.
4. Medicinal uses : In the production of vitamins, enzymes and antibiotics.
5. Role in industry : Useful activities of various bacteria are employed in production of a number of industrial products like lactic acid, curd, cheese, butter, vinegar, curing of tobacco and tea etc.
All too often, people assume that bacteria are bad and always bad. It is not well known that only a very small percentage of bacteria are harmful to humans. The rest of bacteria are either completely harmless to people or beneficial. Bacteria live inside humans in a mutualistic relationship. The bacteria and the person both benefit. In fact, about 1% to 3% of a person's overall body mass is made up of bacteria. This means that a 100 pound person has a bit more than 1 pound of bacteria inside the body. These bacteria have various uses within the body, and helping the digestive process is a common example. Bacteria are also integral in producing various foods. Sauerkraut, sour cream, yogurt, buttermilk, pickles, and vinegar are all produced with the help of bacteria. Bacteria have also entered the manufacturing world, and they are useful for producing various drugs through genetic engineering. In nature, bacteria are also involved with nitrogen fixation and decomposition.
https://www.sciencelearn.org.nz/resources/588-bacteria-good-bad-and-ugly
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