Pollution which can be minimized or eliminated and its components degraded into simpler, harm-less constituents by biological activity is termed as bio-degradable pollution. Dead and decaying remains of plants and animals, products of their metabolic activity, faecal remains, excreta, waste waters and materials which originate from day to day activity in a domestic establishment, agricultural wastes, wastes from agro-based industries, tannery effluents etc, come under this category. Various lipids, fats, oils, proteins, carbohydrates, nucleic acids, urea, cellulose, hemi-culluloses, lignin, pectin etc. along with ash, dust and detergent bearing waters containing plenty of phosphates form the major part of simple bio-degradable pollution.