Continuous advanced treatment system of heavy metal ion-containing tail water and treatment method

Abstract

The invention discloses a continuous advanced treatment system of heavy metal ion-containing tail water and a treatment method, belonging to the field of tail water advanced treatment. The system comprises a mixed reaction tank and a regeneration tank, wherein the mixed reactor is connected with a magnetic force sedimentation tank which is respectively connected with a gravity type hydrocyclone and the regeneration tank, and the regeneration tank is respectively communicated with a rinse tank and a nanofiltration system. The treatment method comprises the following steps: pretreating, adsorbing by the mixed reaction of magnetic anion exchange resin and weak acid cation exchange resin, yielding water, separating adsorbent, separating solid from liquid, transporting resin to the regeneration tank, regenerating resin, cleaning, and disposing resin desorption liquid. The invention mixes the weak acid cation exchange resin with the magnetic anion exchange resin in the same mixed reactor for the first time to treat the heavy metal ion tail water, can remove heavy metal ions and natural organic acid in tail water at the same time in shorter time and can unify high-efficiency tail water treatment and resource recycling.

Description

Technical field: [0001] The invention relates to a tail water advanced treatment equipment and method, more specifically a continuous heavy metal ion-containing tail water advanced treatment system and treatment method. Background technique: [0002] After pretreatment of wastewater from some industries (electroplating, electronics, etc.), the tail water not only contains water-soluble natural organic acids, but also contains heavy metal ions. If it is directly discharged into the environment without advanced treatment, it will cause serious environmental problems. [0003] At present, the removal methods of soluble natural organic acids in water mainly include coagulation method, ion exchange and adsorption method and membrane filtration method, while the methods for removing heavy metal ions mainly include chemical precipitation method, electrolysis method and activated carbon adsorption method. The following problems exist during the application process: [0004] 1) Th...

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Problems solved by technology

[0004]1) The traditional coagulation method has a low removal rate for water-soluble natural organic acids, and it is difficult to remove highly water-soluble and hydrophilic small molecule organic acids; membrane filtration The method has a good removal effect on organic matter, but divalent metal ions in the tail water are easily complexed with organic acids to cause membrane fouling and reduce membrane permeation; traditional anion exchange resins have a good effect on soluble organic acids in water. However, the adsorption column operation process adopted not only consumes a lot of power, but also has high equipment and infrastructure costs, and slow processing speed, and cannot remove heavy metal ions at the same time.

[0005]2) The chemical precipitation method has a certain removal effect on heavy metal ions, but the generated sludge will bring a series of follow-up treatment problems, and the chemical precipitation method is not applicable The electrolysis method has the disadvantages of complex operation and high energy consumption, and cannot remove natural organic acids in water at the same time; while the activated carbon adsorption method has the disadvantages of low adsorption capacity, slow adsorption rate, and difficult regeneration of the adsorbent. defect

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