Organic waste (Protein + Cellulose + Lignin) + O2 → Compost + CO2 + H2O + Heat Usually composting proceeds through three phases utilizing different microorganisms. Initial decomposition is carried out by moderate-temperature mesophilic microorganisms for a couple of days; replacement of the mesophiles with thermophilic microorganisms and heating for anywhere from a few days to several months followed by cooling and maturation for several months yields compost. Finally cooling and maturation phase proceeds for several months. A typical percentage of N-, P-and K-based nutrients in compost is 12%, 07%, and 1.2%, respectively. A strong research trend is immobilization of microorganisms in compost to increase the content of nitrogen, phosphorus and potassium nutrients. Vermicomposting uses worms and bacteria in combination to convert solid organic wastes coming from different sources such as food, plants, animals, pharmaceuticals, and sewage into organic fertilizers. Vermicompost duration usually takes approximately 28-125 days. The resulting vermicompost constitutes N, P, K, and Mg amounts, on average, of about 2.8%, 0.85%, 2.3%, and 0.38%, respectively. Nutrient content strongly depends on vermicompost feedstock and treatments. Vermicompost prepared from coconut husk mixed with either pig slurry or poultry manure allowed microbial biomass carbon and nutrients to recover. The highest N and K recovery were observed for 20% feedstock substitution by pig slurry while poultry manure substitution recorded highest P recovery.