Desulfurization system with zerowastewater emission and reusable slurry and treatment method thereof

Abstract

The invention discloses a desulfurization system with zerowastewater emission and reusable slurry and treatment method thereof. The system comprises a regulation sedimentation pond, a triple-header, a clarifier and a clean water tank, all of which are connected sequentially. The regulation sedimentation pond is communicated with the waste water source. The triple-header comprises a reaction rank, a neutral tank and a coagulation tank connected in sequential order. The reaction tank is connected with the regulation sedimentation pond. The coagulation tank is connected with the clarifier. The reaction tank is connected with an organic sulfur dosing device. The bottoms of the regulation sedimentation pond, the triple-header and the clarifier are all communicated with a slurry storage pond through pipes. A first pump provides the power to drive the slurry in the pipe. The slurry storage pond is communicated with a desulfurization tower through pipes. A second pump provides the power to drive the slurry to flow. The slurry is used as the desulfurization agent and is ejected into the desulfurization tower for desulfurization. Through the variation of dosing sequence and the change of the property of the heavy metal sediments, the slurry can be returned to the desulfurization system without being dissolved again. The slurry in the desulfurization waste water treatment process can be completely reused.

Description

technical field [0001] The invention relates to a wastewater zero-discharge treatment process, in particular to a sludge reuse zero-discharge treatment system and treatment method for desulfurization wastewater. Background technique [0002] The desulfurization wastewater is produced from the calcium carbonate-calcium sulfate wet flue gas desulfurization system. The water quality is acidic and contains a large amount of suspended solids, salts, heavy metal ions, fluoride ions, etc. The salts are mainly sodium, potassium, calcium, magnesium chloride and sulfate, the suspended matter is mainly gypsum and silicon dioxide, and the heavy metals are mercury, cadmium, chromium, lead, nickel, copper, zinc and other metal ions Existing in form, if discharged directly into the environment, it is very harmful. [0003] The current treatment methods mainly use chemical precipitation + membrane concentration + evaporation crystallization, and neutralize, remove heavy metals, and clarify...

AI Technical Summary

Problems solved by technology

The clear water after clarification treatment enters the zero discharge system for further treatment, and the sludge deposited during the clarification process enters the dehydration device. The large amount of sludge is easy to cause pipeline fouling

Moreover, the dehydrated sludge contains a large amount of heavy metals, which can only be treated as hazardous waste, and the treatment cost is very high

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