Water clarifierBHQ-138 is a mixture of organic cationic polyacrylamide and its derivatives, is a water dispersion system and effectively increases solid content. It is applicable to wastewater treatment systems with low oil content and has a strong oil floating capability. It is used for wastewater treatment systems of oilfields and water treatment systems of factories and can accelerate demulsification speed of emulsified oil in wastewater and can make oil droplets rapidly flocculate to become large and floated. Used in wastewater treatment systems of oilfields, it can increase oil removal rates of equipments such as coalescers, flotation machines and hydraulic cyclones.