NECESSITY FOR ZERO LIQUID DISCHARGE (ZLD) SYSTEMS IN SLAUGHTERHOUSES, RENDERING, AND ABATTOIRS
NECESSITY FOR ZERO LIQUID DISCHARGE (ZLD) SYSTEMS IN SLAUGHTERHOUSES, RENDERING, AND ABATTOIRS 21.1 Introduction to ZLD Zero Liquid Discharge (ZLD) is an advanced wastewater treatment approach designed to eliminate all liquid waste from a facility by recovering and recycling almost all wastewater generated. ZLD systems treat wastewater to such high standards that the treated water can be reused internally or safely discharged, with minimal or no liquid effluent leaving the plant. 21.2 Why ZLD is Crucial for Slaughterhouses, Rendering, and Abattoirs 21.2.1 High-Strength Wastewater Characteristics Wastewater from these facilities contains extremely high concentrations of organic matter, suspended solids, fats, oils, blood, proteins, nitrogen, phosphorus, and pathogens. Conventional wastewater treatment often cannot reduce pollutants below stringent discharge limits, especially in areas with limited water bodies or stringent environmental regulations. 21.2.2 Environmental Protection ...