Sewage treatment system

Abstract

The invention discloses a sewage treatment system. The sewage treatment system is characterized in that a sludge adjusting pond is connected with an inlet pipeline of a first-order neutralization reaction tank through a lift pump; an outlet pipeline of the first-order neutralization reaction tank is connected with the inlet pipeline of a primary thickener; a sludge outlet of the primary thickener is connected with a sludge concentrating pond through the lift pump; the outlet pipeline of the primary thickener is connected with the inlet pipeline of a second-order neutralization reaction tank; the outlet pipeline of the second-order neutralization reaction tank is connected with the inlet pipeline of a secondary thickener; the sludge outlet of the secondary thickener is connected with the sludge concentrating pond through the lift pump; a supernate pipe orifice on the sludge concentrating pond is connected with the sludge adjusting pond; the sludge outlet of the sludge concentrating pond is connected with a filter press through a mortar pump; a liquid outlet of the filter press is connected with the sludge concentrating pond; the outlet pipeline of the secondary thickener is connected with a recycling pool. By adopting the sludge treatment system, the handling capacity of the filter press is greatly reduced; the sludge treatment cost is also reduced.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment of non-ferrous metal smelting, relates to settling and separating equipment for insoluble sediment in the process of sewage treatment, and in particular to a sewage treatment system. Background technique [0002] In non-ferrous metal smelting, the produced wastewater is basically acidic wastewater containing heavy metal ions and arsenic, antimony, and bismuth oxides. The basic method for treating such wastewater is to add lime milk solution and iron salt solution to the wastewater, and then react through aeration , the metal ions in the wastewater undergo chemical reactions to produce insoluble precipitates, which are then clarified and separated by a thickener. The concentration of metal ions in the wastewater is lower than the national standard, and then discharged or returned to production for reuse. The sewage treatment system in the current technology adopts a section of natural sett...

AI Technical Summary

Problems solved by technology

The disadvantage of this kind of sewage treatment system is that it needs to deal with a large bottom flow, which increases the running time of the filter press equipment and increases the cost of sewage treatment.

[0003] At the same time, the reaction tanks used in the sewage treatment of non-ferrous smelters generally have the following problems in production and operation. 1. With the long operation time, the sludge will seriously scale in the neutralization tank, which reduces the capacity of the neutralization tank. volume, resulting in the short residence time of sewage metal ions, arsenic, antimony, bismuth oxides and chemicals in the reaction tank, resulting in insufficient reaction, and prone to the problem of excessive impurity elements after the reaction

2. The compressed air in the aeration pipe violently stirs the solution in the reaction tank, causing the solution to tumble violently, and the solution is prone to splash out of the reaction tank

[0004] The problems of the existing thickeners are 1. The sewage directly enters the thickener through the liquid inlet pipe; 2. The shape of the overflow plate is flat; 3. There is no automatic lifting and alarm device

Due to the unreasonable design, there are the following problems: (1) The flow rate of the sewage into the thickener is fast, and it directly enters the thickener, which is easy to stir the sewage that is settling, and the sludge sediment at the bottom of the settlement will be returned to the sewage; (2) When If the overflow plate is installed unevenly, it is easy to cause the supernatant to overflow from the lowest point of the overflow plate, which is not conducive to sludge settlement; (3) there is no automatic lifting and alarm device, when the sludge below is thicker, the sludge will be scraped The movement of the plate is hindered, and the stirring shaft of the mud scraper is easily damaged

[0005] Therefore, the structure of the sewage treatment system in the prior art is unreasonable and needs to be further improved

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