Device and method for treating concentrated rubbish leachate by combining with MVR

Abstract

The invention relates to a device and method for treating concentrated rubbish leachate by combining with an MVR. Raw material liquid is preheated by a plate heat exchanger I; then, the liquid is pumped into a plate heat exchanger II by a forced circulating pump for high-temperature heating, the liquid heated to reach certain temperature enters a separator, and produced steam enters a condensed water tank for cooling; flash evaporation is conducted on the high-temperature liquid entering the separator, produced concentrated liquid is discharged by a discharging system at the bottom of the separator, and the produced steam is compressed and then enters the plate heat exchanger II; water produced by condensing the steam entering the plate heat exchanger I is pumped into a preheating system by a condensed water pump for reutilization, and gas enters a vacuum system; the gas is re-cooled, and non-condensed gas is discharged out by a vacuum pump. The MVR is applied to RO concentrated liquidtreatment, the total recovery rate of the project is greatly improved, a little amount of concentrated liquid treated by the MVR enters rubbish incineration hearth for combustion, and the concentrated liquid treatment problem of a membrane system in a rubbish leachate treatment system is thoroughly solved.

Description

technical field [0001] The invention relates to the field of garbage treatment, in particular to a device and method for treating garbage leachate concentrate combined with MVR. Background technique [0002] At present, biochemical treatment + membrane advanced treatment is generally used for landfill leachate treatment. However, when membrane treatment is applied to landfill leachate treatment, although it can ensure that the produced water meets the discharge standard to a certain extent, the recovery rate of the membrane system is generally around 75%. The remaining 25% concentrate has always been a difficult problem for the industry to deal with. Membrane system concentrate is currently mainly used to recharge landfills, but the membrane system concentrate has a large salt content and more difficult-to-treat organic matter. The long-term operation of such a concentrated solution for refilling the landfill will inevitably lead to an increase in the salt content of the me...

AI Technical Summary

Problems solved by technology

[0002] At present, biochemical treatment + membrane advanced treatment is generally used for landfill leachate treatment. However, when membrane treatment is applied to landfill leachate treatment, although it can ensure that the produced water meets the discharge standard to a certain extent, the recovery rate of the membrane system is generally around 75%. The remaining 25% concentrate has always been a difficult problem for the industry to deal with

Membrane system concentrate is mainly used to recharge landfill at present, but the membrane system concentrate has a large salt content and more difficult-to-treat organic matter

Such concentrated liquid refills the landfill, and if it continues to operate for a long time, it will inevitably lead to an increase in the salt content of the membrane system influent, easy fouling during the operation of the membrane system, a decrease in the operation cycle, and a decrease in the quality of the produced water.

Images