Acid wastewater treatment system and method

Abstract

The invention belongs to the technical field of water treatment and in particular relates to an acid wastewater treatment system and a method. The system comprises an acid wastewater regulating tank, a lifting pump, a one-section primary neutralizing tank, a one-section oxidization tank, a one-section secondary neutralizing tank, a flocculation tank, a one-section inclined plate thickener, a two-section primary neutralizing tank, a two-section oxidization tank, a flocculation tank, a two-section inclined plate thickener, a mechanical acceleration clearing tank and a clear water tank, wherein the one-section inclined plate thickener is respectively connected with the one-section primary neutralizing tank and the two-section primary neutralizing tank by a second sludge reflux pump; the one-section inclined plate thickener is further connected with a filter press by a bottom-flow conveying pump; the two-section inclined plate thickener is connected with the one-section primary neutralizing slot by a third sludge reflux pump; and the mechanical acceleration clearing tank is connected with the one-section primary neutralizing slot by the first sludge reflux pump. On the condition of increasing investment, the system disclosed by the invention lowers acid wastewater treatment cost, comprehensively utilizes wastes, and realizes optimal automation and cyclic utilization of water resources.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to an acid wastewater treatment system and method. Background technique [0002] The traditional process of acid wastewater treatment in lead and zinc smelters generally adopts two-stage lime-iron salt method, and there are the following deficiencies in the production management process: (1) The bottom outflow outlet of the thickener was originally designed as a manual valve, which cannot realize the automatic system, resulting in a large number of (2) In the original design, no return pipe was designed for the underflow of the first-stage thickener. The heavy metals in the first-stage thickener effluent have basically reached the standard. It is not obvious, resulting in unqualified effluent; (3) The lime slag and stone gall produced in the preparation of milk of lime in the original design are directly pulled into the slag silo by truck, resulting in poor surro...

AI Technical Summary

Problems solved by technology

[0002] The traditional process of acid wastewater treatment in lead and zinc smelters generally adopts two-stage lime-iron salt method, and there are the following deficiencies in the production management process: (1) The bottom outflow outlet of the thickener was originally designed as a manual valve, which cannot realize the automatic system, resulting in a large number of (2) In the original design, no return pipe was designed for the underflow of the first-stage thickener. The heavy metals in the first-stage thickener effluent have basically reached the standard. It is not obvious, resulting in unqualified effluent; (3) The lime slag and stone gall produced in the preparation of milk of lime in the original design are directly pulled into the slag silo by truck, resulting in poor surrounding environment, and at the same time, the amount of storage in the slag silo increases; (4) In the original design, only automatic (pneumatic) control valves are installed in the dosing pipes of lime milk and other neutralization tanks, which is not conducive to normal operation and use; (5) in the original design, ordinary reoxygenation mixers are used in each oxidation tank, and the reoxygenation effect is not ideal

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