Abstract
A mixture of aluminum salts and natural polyelectrolytes, extracted from the cactus Opuntia ficus índica, has been used for cleaning of wastewater from poultry slaughterhouse. The aggregation and settling properties of colloids and complex organics such as oil, grease, fats, proteins, and suspended solids, was increased if compared with conventional methods of wastewater treatment using only aluminum or iron sulfate. A mixture of aluminum salt in a concentration range of 300 to 600 mg l−1 and natural polyelectrolytes of 0.6 to 0.8 mg l−1 was used for flocculation and coagulation. The combination of coagulant and natural polyelectrolytes was able to remove chemical oxygen demand (86%), oil and grease (93%), turbidity (89%), and suspended solids (93%). Methanization activity was also investigated for the effluents in natura.
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