Effect of coagulant and flocculant addition scheme on the treatment of dairy farm wastewater

摘要: Our group was approached by a manufacturer of treatment trains to recycle wastewater from dairy farm manure. Company X consist microscreening, sedimentation and filtration units attached reverse osmosis (RO) membrane. To enhance screening, coagulant flocculant are added the stream feeding microscreen. However, their customers experience foaming on microscreen as well frequent fouling RO membranes. This study aimed identify source optimize performance train. Results show that interactions between alum coagulant, polymer contaminants cause foaming. Addition silicon antifoam A effectively reduced foaming, while maintaining same removal total suspended solids (TSS) organic carbon (TOC). Alternatively, we proposed new reagent addition scheme which circumvents back-to-back coagulant. The resulted in significant reduction ∼50% increase TSS TOC removal, even at 40% lower dose cationic polymer. In economic benefit, low concentration left-over should alleviate