The most important characteristic of wastewater generated from livestock farms, especially pig farms, is the content of organic matter and nutrients expressed as parameters such as: COD, BOD.5, TN, TP. , SS … these parameters are the main causes of environmental pollution. These components are easy to decompose, cause stench, generate toxic gas, reduce the amount of dissolved oxygen in the water and especially if not treated when discharged into the receiving source, it will pollute the environment. fertilizing the ecosystem, affecting crops and being an important source of nutrients for harmful bacteria to grow. In addition, wastewater from livestock farms contains high levels of disease-causing bacteria, which directly affect the health of humans and animals in the region

In pig farms, widespread use of manure with a large amount of wastewater is generated. In organic waste water, accounting for 70-80% includes cellulose, protit, amino acids, fat, carbohydrates and their derivatives in feces and leftovers. Most biodegradable organic substances, inorganic substances accounting for 20-30% include sand, soil, salt, urea, amonium, salt, chloride, SO42-

In wastewater, organic matter accounts for 70-80% including protit, amino acids, fats, carbohydrates, … easily biodegradable and has a high nutrient content, so treated by biological methods is the most suitable.

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