Ferric sulphate to clean chicken processing plant wastewater

摘要

Wastewater from processing plants must be purified before reusing or releasing it into open water. Experiences in Mexico have taught that using ferric sulphate improves the cleaning process. Chicken processing plants (CPPs) use large quantities of clean water in proessing and production. This means that there is a very high risk of environmental pollution, as more than 90 percent of clean water is converted into wastewater. Water used in most processing plants has three basic functions: 1. To cleanthe carcass during the process and afterwards, 2. To cool down the carcass after taking out the internals (guts), and 3. To clean the installation in general. Wastewater from processing plants has a high concentration of colloidal suspended solids (blood) and waste (mainly feathers, excrement and pieces of chicken), BOD_5, grease, oils, and, though it might soundm strange, colouring. This last component is due to the fact that in Mexico commercial chickens are coloured to have a yellowish appearance. Otherwise consumers would not buy the chicken.