Acid-containing wastewater concentration recycling system and process flow

Abstract

The invention relates to an acid-containing wastewater concentration recycling system, which comprises an ultrafiltration device, a reverse osmosis device and a vacuum distillation device, wherein thevacuum distillation device comprises an evaporation tank, a condenser and a buffer tank; the evaporation tank is connected with a vacuum pump; a heating pipe is arranged in the evaporation tank; a heating jacket is arranged at the bottom of the evaporation tank; waste liquid enters the evaporation tank through a waste liquid inlet; heated steam enters the heating pipe and the heating jacket to heat external waste liquid; the steam is changed into water and flows out of the evaporation tank through a steam water outlet; water vapor enters the condenser through a water vapor outlet; a wastewater concentrated solution is discharged into a concentrated solution recovery tank through a concentrated solution outlet; the water vapor is condensed by cooling water in the condenser and is discharged into the buffer tank through the water vapor outlet; and distilled water is pumped into the reverse osmosis device through a liquid discharge pump. By the adoption of the acid-containing wastewaterconcentration recycling system, not only can water be recycled, but also mixed acid can approach a recycling standard, zero emission is achieved, and maximization of resource utilization is met.

Description

technical field [0001] The invention relates to waste water treatment, in particular to a concentration and reuse system and process flow of acid-containing waste water. Background technique [0002] Surface treatment companies need to use high-concentration phosphoric acid and sulfuric acid (hereinafter referred to as mixed acid) during production. After the parts are treated in the mixed acid tank, the mixed acid remains on the surface and need to be cleaned with industrial water. The concentration of 5-10% mixed acid belongs to hazardous waste. There are two main treatment methods at present: [0003] First: dilute first, then special treatment, and finally conventional treatment; the disadvantages of this treatment method are: 1. The amount of new water must be added for dilution; Chemicals, neutralization tanks, sedimentation tanks, etc. are required, so this method occupies a large area and generates more waste than before, which not only cannot effectively use resour...

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Problems solved by technology

[0003] First: dilute first, then special treatment, and finally conventional treatment; the disadvantages of this treatment method are: 1. The amount of new water must be added for dilution; Chemicals, neutralization tanks, sedimentation tanks, etc. are required, so this method occupies a large area and generates more waste than before, which not only cannot effectively use resources, but also causes a lot of waste;

[0004] Second: outsourcing treatment, outsourcing high-concentration waste liquid to qualified enterprises that specialize in the treatment of concentrated waste liquid, usually by incineration; the disadvantages of outsourcing treatment methods are: 1. It takes a lot of money to outsource to enterprises for treatment Funds; 2. The resources bought with money have not been recycled

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