Pulp&paper wastewater, fermentation industry wastewater (alcohol and yeast), pharmaceutical wastewater, etc. all belong to high concentration organic wastewater. Based on the characteristics of the wastewater, Purac adopts anaerobic treatment, aerobic treatment, Fenton deep treatment and other combination processes. While meeting water quality standards for discharge, energy conservation and consumption reduction, the organic matter in the wastewater is transformed into green energy and utilized, Purac brings added value and high-quality engineering to customers and winning their trust.

SELAC ^® Aerobic Activated Sludge Process (Selection Tank + Activated Sludge Aeration Tank)

In order to increase the BOD concentration at the front part of aeration tank, promote the proliferation of floc forming bacteria, inhibit the growth of filamentous bacteria, effectively suppress the expansion of activated sludge, and increase the operational reliability of the activated sludge process, the reflux sludge is mixed and contacted with the raw water in the selection tank. This creates conditions for microbial populations to compete for survival in high concentration and high load environment, selects unique microbial populations suitable for the system, and effectively inhibits the excessive proliferation of filamentous bacteria, avoiding the occurrence of sludge swelling phenomenon.

The high-quality aeration system saves energy while having no impact on the surrounding environment:

• Flexible operation, controlling the aeration system with load fluctuations to save energy and reduce consumption
• Good and stable effluent quality
• Low risk of sludge expansion
• Low operation and maintenance costs
• Low operating costs
• No maintenance is required inside the aeration tank

Purac also introduced aeration equipment for the aerobic treatment process—efficient jet aerator, which solved the long-standing problem of poor water quality caused by frequent blockage or damage of aerators for many industrial customers.