Treatment system and method for resource utilization of nanofiltration strong liquor

Abstract

The invention discloses a treatment system for resource utilization of a nanofiltration strong liquor. The system comprises a chemical pretreatment subsystem, wherein the chemical pretreatment subsystem is provided with a liquor inlet tank, a fast mixing tank and a slow mixing tank which are connected in sequence; the liquor inlet tank is provided with a nanofiltration strong liquor inlet; an on-line pH meter and a first alkalinity dosing device are both arranged on the fast mixing tank; the first alkalinity dosing device is electrically connected with the on-line pH meter; an on-line total alkalinity indicator and a second alkalinity dosing device are both arranged on the slow mixing tank; the second alkalinity dosing device is electrically connected with the on-line total alkalinity indicator; the slow mixing tank is provided with a pretreated mixed liquor outlet; the pretreated mixed liquor outlet of the chemical pretreatment subsystem is sequentially connected with an MVR evaporation subsystem and a condensed water pharmaceutical treatment subsystem; a recycle water outlet of the condensed water pharmaceutical treatment subsystem is connected with a circulating water replenishing opening of the MVR evaporation subsystem. The system can realize the resource utilization of the nanofiltration strong liquor, and is low in energy consumption and good in treatment effect.

Description

technical field [0001] The present invention relates to the field of concentrated solution treatment, in particular to a treatment system and method for recycling nanofiltration concentrated solution. Background technique [0002] Domestic garbage leachate is a kind of high-concentration organic wastewater, which has the characteristics of many types of pollutants, complex components and extremely unstable changes. The leachate mainly comes from the precipitation in the landfill plant and the water contained in the garbage itself, and its pollution components include: organic matter, inorganic ions and nutrients. Among them are mainly ammonia nitrogen and various dissolved ions, heavy metals, phenols, soluble fatty acids and other organic pollutants. The COD concentration of landfill leachate is generally 6,000 to 30,000 ppm, the ammonia nitrogen concentration is generally 600 to 3,000 ppm, and the pH value is generally between 5 and 8.6. If not handled properly, landfill ...

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Problems solved by technology

Since the concentrated waste liquid has the characteristics of high salt and high organic matter, there is no pretreatment system before entering the "MVC" evaporation system, which often causes serious blockage of the preheater; after entering the evaporator, with the evaporation and concentration of high-concentration organic waste liquid, the waste liquid Crystals such as medium calcium and magnesium are precipitated and attached to the tube wall, causing serious fouling of the evaporator, which seriously affects the evaporation efficiency and increases steam consumption; the concentrated liquid and condensed water produced by the evaporation system cannot be effectively disposed of after DI treatment. will cause secondary pollution

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