Integrated Solution for Acidic Water Treatment: CDFU, SiC Filtration, and KHC Coalescing Oil-Water Separator

Acidic water treatment solution by Shenzhen Clear Science & Technology Co., Ltd (SINOKLE): Achieving oil-water separation with CDFU + SiC Filter + KHC Coalescing Oil-Water Separator

This technology features the following:

Figure 1. Process Flow Diagram

First, the acidic wastewater is passed through an Oil-Water Separator for preliminary oil-water separation (based on the difficulty of the incoming water treatment). It then enters the CDFU (Cyclonic Dissolved Gas Flotation Unit), where under the influence of the cyclonic flow, free oil, dispersed oil, emulsified oil, and suspended solids quickly collide and adhere to the micro-nano gas bubbles generated by dissolved gas. The emulsified oil and suspended solids, adhered to the micro-nano bubbles, break the oil film due to surface tension and other physical properties, achieving pure physical demulsification. The oil and suspended solids that have been broken down are aggregated and float to the top of the tank, entering the internal oil collection drum, from which they are discharged via the oil outlet under self-pressure. The treated water then passes through a lift pump into the SiC filter, where the absolute particle size of the suspended solids can reach 10μm. After separation, the wastewater is discharged into the oil collection tank. The wastewater outlet gases from the CDFU are sent to the flare liquid separation system.

The effluent from the CDFU, after being lifted by the pump, enters the SiC filter, where suspended solids, colloids, and other impurities are intercepted. The absolute particle size of the suspended solids in the effluent can reach 1μm. The water then enters the coalescing oil-water separator. When the filter system’s pressure differential becomes large, backflushing is required to clean the impurities and oil on the filter element, preventing clogging. The backflush wastewater is directed to the oil collection tank.

The acidic wastewater then enters the KHC Coalescing Oil-Water Separator, where special coalescing materials are used to combine small oil droplets into larger ones, achieving physical demulsification. After demulsification, the oil layer and water layer separate due to density differences, with the oil being discharged from the top oil outlet, having a water content of less than 10%. The wastewater is discharged from the bottom drain, thus achieving oil-water separation. The treated water has an oil content of less than 50ppm (excluding dissolved oil).

The CDFU, SiC filter, and KHC Coalescing Oil-Water Separator’s effluent, oil discharge, sludge discharge, exhaust, and air replenishment are all controlled automatically. The dissolved gas system’s airflow is also automatically controlled.

This process operates in fully automated, sealed, pressurized mode, with waste gases routed to the flare liquid separation system, ensuring no safety or environmental risks.

Table 1. Inlet and Outlet Water Indicators for This Acidic Water Treatment Process

Case Study:

Figure 2. On-site Photo of KHC Coalescing Oil-Water Separator and Treatment Effect Display, from Right to Left: Inlet Water, Filter Effluent, Oil-Water Separator Effluent