Desulfurized waste water treatment method and system

Abstract

The invention provides a desulfurized waste water treatment method. The method comprises the steps that 1, desulfurized waste water enters an aeration adjusting pool, and sulfite ions in the desulfurized waste water are oxidized into sulfate ions under the action of an aeration device; 2, the desulfurized waste water is conveyed into a pH adjusting box, and lime is put into the pH adjusting box to relieve temporary hardness; 3, in a first-level reaction settling box, organic sulfur is added for further depositing heavy metal which can not be deposited in a hydroxide form; 4, in a first-level flocculation box divided into two cases, coagulant is added, many tiny floccules are condensed and formed; 5, the tiny floccules are conveyed into a first-level clarification tank so that the generated floccules and suspended solids in the waste water can be deposited and separated; 6, sodium carbonate and a sodium hydroxide solution are added into a second-level reaction settling box, and calcium ions and remaining magnesium ions in the waste water are deposited; a second-level clarification tank is used for depositing and separating the generated floccules; water produced by a multi-medium filter is sprayed into a flue to be vaporized through a spiral atomizing nozzle.

Description

1. Technical field

[0001] The invention relates to the treatment of desulfurization wastewater in thermal power plants, and relates to a desulfurization wastewater treatment method and system. 2. Background technology

[0002] With the rapid development of my country's energy industry and the construction of large-scale coal-fired power plants, fuel consumption continues to increase, SO 2 emissions are increasing. Currently, flue gas desulfurization is considered to be an effective way to control SO 2 The most efficient way to reduce emissions. Limestone-gypsum wet flue gas desulfurization is the most widely used and most mature desulfurization process in the world. The desulfurization wastewater produced by the limestone-gypsum wet method has a pH of 4-6 and contains a large amount of suspended matter (gypsum particles, SiO 2 , Al and Fe hydroxides), fluorides and various heavy metal ions (As, Cd, Cr, Hg, etc.), with high hardness and high salt content. Direct discharg...

Images