Treatment scheme of landfill leachate

The quality of landfill leachate is affected by the composition of garbage, precipitation, landfill technology, landfill time and other factors. It has the characteristics of complex composition, high nitrogen concentration and great water quality change, and it is difficult for conventional biochemical treatment methods to meet the standard. Compared with biochemical method, membrane separation technology is less affected by the change of raw water quality and can keep the effluent quality stable, so it has obvious advantages in treating landfill leachate. Dish-tube reverse osmosis (DTRO) process is a new reverse osmosis treatment technology, which is widely used in the treatment of high concentration feed liquid and landfill leachate.

The process flow of landfill leachate (DTRO) is as shown in the figure.

Leachate is first collected in the regulating tank to adjust the water quality and quantity, and the pH value of the effluent from the raw water storage tank is adjusted by adding acid to prevent scaling of carbonate inorganic salts, and then filtered by sand filtration and core filtration to reduce SS concentration. The pretreated leachate enters the primary system, and is subjected to reverse osmosis in the membrane module; the generated permeate enters the secondary DTRO system, and the primary DTRO concentrated solution is discharged into the concentrated solution storage tank for recharging; The permeate of the secondary DTRO system is discharged into the degassing tower, and the gas such as carbon dioxide in the water is blown off to make the pH value reach 6-9, and then it enters the clean water tank and is discharged up to the standard. The concentrated solution of the second-stage DTRO flows back to the water inlet end of the first-stage DTRO. Zheng Jin Environmental Protection Co., Ltd. is a manufacturer of DTRO membrane and has many years of engineering experience in treating landfill leachate with DTRO membrane.