... free: 0.05% maximum 4.drilling mud additives Oilfield chemicals Anionic Polyacrylamide/APAM: 1) Appearance: white granule2) Molecular ... sewage treatment,paper,food processing,petrochemical,metallurgical, processing, dyeing and the sugar and all kinds of industrial wastewater ... , high efficiency products. 5. Can be used for dyeing wastewater, leather wastewater, oily wastewater treatment, so that ...