Generally, the flue gas desulfurization (FGD) wastewater refers to the discharged water from the gypsum dewatering system and cleaning system, and the overflow water of wastewater cyclone. The wastewater quality is influenced by various factors in the power generation process. For instance, the purity of coal used, the operating conditions of the power plant, the quality of desulfurization process, and the purity of limestone. The FGD wastewater characterized as high turbidity, high hardness and high COD coupled with large variations in water quality and quantity. Thus, the FGD wastewater treatment is quite complicated but nonetheless important.

FGD Wastewater Treatment

Typical Processes of FGD Wastewater Treatment

SafBon Research

In order to overcome the FGD treatment dilemma, which mainly caused by the FGD wastewater complex features, SafBon cooperated with institute of power plant chemistry at Wuhan University established an associated lab focusing on the development of zero discharge technology development for industry. The cooperation resulted in the development of an innovative system which integrates and consists of a new technology developing phase, a pilot-scale testing phase, a pilot exercise phase and a talent cultivating phase. Not only can this new lab facilitate the research and development of strategic frontier technologies, it can also contribute to the testing and development of feasible technical solutions for the clients in wastewater management.

FGD Wastewater Treatment

As shown in the flow diagram, there are generally three steps in the process: pre-treatment, evaporation and crystallization. There are a number of treatment approach options that SafBon provides, such as physicochemical methods, electrochemical methods, biological methods and spray drying methods.

In order to respond the low environmental impact requirements, the wastewater treatment process has been improved. When a certain degree of pre-concentration is achieved, the wastewater is evaporated and crystallized in the forced circulation system. With additional reverse osmosis, evaporation and crystallization processes, the wastewater treatment by SafBon is able to achieve the zero liquid discharge (ZLD) requirement.