definition of coagulation in water treatment

{"cid":"91224806","title":"Factory Supply 30% Polyaluminium Chloride PAC Coagulant in Water Treatment Field","imgUrl":"https:\/\/img.chinax.com\/nimg\/17\/d0\/1b7b574a75e3b6764e53e75a6302-200x200-1.jpg","attrs":{"Price":"USD450","Brand Name":"OYI","Model Number":"PAC-100","Minimum Order Quantity":"5","Delivery Time":"5-15DAYS","Supply Ability":"2000T\/M","Purity":"30%","Certification":"NSF","Package":"25kg\/bag or as the customer's needs,25kg\/bag,can be customed,25kg bags","Product name":"polyaluminium chloride,Poly Aluminum Chloride, PAC 30%,PAC","Payment Terms":"L\/C,D\/A,T\/T,D\/P,Western Union","Application":"waste water\/drinking water treatment,drinking water treatment and waste water treatment,water treatemnt\/papermaking\/ chemical,industial agent,Water Purification","Place of Origin":"CHINA","Sample":"free sample,0.5-1kg","Cas no.":"1327-41-9"}}

{"cid":"91199664","title":"ISO9001 Rustproof Compact Portable Wastewater Treatment Units","imgUrl":"https:\/\/img.chinax.com\/nimg\/67\/e1\/61a6e420f73e1eb6496e0a4f832d-200x200-1.jpg","attrs":{"Price":"Negotiable","Brand Name":"SINOPRS","Model Number":"FS","Minimum Order Quantity":"1 set","Delivery Time":"30 working days after contract signed","Certification":"ISO9001","Place of Origin":"China","Payment Terms":"L\/C, T\/T","Supply Ability":"20 sets per month","Packaging Details":"Standard Packing","Material":"SS304\/316L,Carbon steel, Stailess Steel 304\/316L","Application Fields":"Hotels, Building Material Shops, Manufacturing Plant...","Color":"Customerized","Advantage":"save cost and space","Processing":"Pretreatment+Biochemical","Technology":"AO\/MBR\/MBBR\/SBR..."}}