Treatment Process for Leachate from Waste-to-Energy Power Plants

The process steps are as follows:

(1) Ordinary leachate from the waste pit leachate tank and sewage from the domestic sewage tank are input into the leachate regulation tank for storage, mixing, and equalization.
(2) The mixed leachate from the leachate regulation tank is conveyed to a composite sedimentation tank for separation and settling. Settled pollutants like sludge are discharged into the sludge treatment tank.
(3) The settled leachate is injected into a water quality equalization tank, where low-concentration water from the supernatant tank is introduced for quality equalization and blending.
(4) The equalized leachate is introduced into an external membrane bioreactor (MBR) for biodegradation and further solid-liquid separation. The separated sludge is discharged into the sludge treatment tank.
(5) The sludge treatment tank collects the sludge and performs centrifugal dewatering. The separated supernatant and dewatered sludge are discharged into the supernatant tank and dewatered sludge tank, respectively.
(6) The degraded leachate is sequentially filtered and separated by an NF system and an RO system, and the standard-compliant clear liquid is output. The concentrated liquid separated by nanofiltration and reverse osmosis is collected in a concentrated liquid tank and then discharged back into the waste pit.