In the aeration tank, microorganisms are "fed", meaning that they consume any waste left on the wastewater. One type of aeration tank uses air bubbles to provide the micrioorganisms sufficient oxygen to survive.
it is your hair
Ensure that you have not added anything to the tank that may have soap residue on it including your hands. Otherwise if you have used a product called Melafix, this can cause bubbles with aeration.
By Using TRO(Turkey's red oil)
No, however a goldfish will greatly benefit from having one. An air pump provides an added source of aeration which increases the levels of dissolved oxygen in the tank. This in-turn makes it easier for the fish to breath.
by drain the sludge of secondary tank from time to time....and one may also maintain mlss by the addition of jaggery ...
Depends on whether or not you have aeration (an air pump). If no aeration, then you shouldn't put more than 2-3 fish "inches" (total inches of fish) in the aquarium. If you do have aeration going, then you can double this amount and have up to 6 inches of fish.
Aerobic bacteria in aeration tanks help break down organic matter in wastewater by using oxygen for respiration. This process helps reduce the organic load and pollutants in the water, making it cleaner and safer for discharge into the environment.
Aerobic bacteria breath oxygen as they do their work. These aerobic bacteria are needed to convert the deadly poisonous Ammonia that all fish produce in water, firstly into poisonous Nitrite and then convert the Nitrite into virtually harmless Nitrate.
Yes
Sludge retention time = lbs of SS in the system/lbs of SS leaving system or aeration tank MLSS x volume of aeration tank and secondary clarifier (as million gallons) x 8.34 / WAS TSS conc x WAS flow x 8.34 + Effluent TSS conc x Effluent Flow X 8.34
Because they are fed by humans