Wastewater treatment method of incineration plant

Abstract

A wastewater treatment method for an incineration plant is provided which can efficiently recover the heat of combustion exhaust gas in the incineration plant and can stably and efficiently concentrate wastewater. This wastewater treatment method is for treating wastewater discharged from an incineration plant which is provided with an incineration device, a combustion exhaust gas heat recovery device, and a temperature reduction device for further reducing the temperature of the combustion exhaust gas from which heat has been recovered by said heat recovery device. This method involves performing a membrane separation step 6 for separating the wastewater discharged from the incineration plant into permeated water and concentrated water by means of a separation membrane, and involves lowering the temperature of the combustion exhaust gas by spraying at least part of said concentrated water into the temperature reduction device 3. A wastewater mixture of at least two types of incineration plant wastewater, namely boiler stored water, boiler blowdown water, cooling tower blowdown water and gray water, is subjected to the membrane separation treatment step 6.

Description

technical field [0001] The invention relates to a method for treating waste water discharged from an incineration plant. Background technique [0002] As a treatment method for waste water discharged from an incineration plant equipped with an incinerator that burns organic matter, a heat recovery device that recovers the heat of the combustion exhaust gas discharged from the incinerator, and a cooling device that further cools the heat-recovered combustion exhaust gas , a wastewater treatment method in which the wastewater is coagulated with a coagulant or the like and then filtered. [0003] Also, a wastewater treatment method is known in which wastewater discharged from an incineration plant is coagulated with a coagulant or the like, followed by biological treatment, and then filtered through sand filtration (Patent Document 1). Patent Document 1 describes that most of the purified water purified by this wastewater treatment method can be discharged. [0004] In recent...

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Problems solved by technology

[0009] However, the wastewater discharged from the incineration plant is various, and there are problems such as clogging of the membrane due to water quality, insufficient reduction, unstable operation, and frequent maintenance and washing treatment.

In addition, the backwash water of the membrane filtration device is the water in the state of concentrated suspended solids (Suspend Solid, SS) in the wastewater, so there are disadvantages such as nozzle clogging during spraying and maintenance is required

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