Treatment system and treatment method for wastewater containing low-concentration sulfuric acid

Abstract

The invention discloses a treatment system for wastewater containing low-concentration sulfuric acid. The treatment system comprises a collection tank, a neutralization barrel, a first filter press, asewage treatment system, a first conveyor belt, a pulping tank, a liquid storage tank, a double decomposition reaction barrel, a second filter press, a cooling crystallizer and a centrifugal machine.The treatment system has the beneficial effects that the structure is simple and easy to implement; evaporation and concentration of an evaporator are avoided, the production cost of ammonium sulfateis reduced, and the system is suitable for treatment of wastewater containing sulfuric acid of any concentration; at the same time, the energy consumption is low, the method is simple, and the treatment efficiency is high; the production method is environmentally friendly; sulfuric acid in wastewater is recovered and separated from the wastewater, so as to create favorable conditions for the biochemical treatment of the wastewater.

Description

Technical field: [0001] The patent of the invention belongs to the field of industrial environmental protection, and specifically relates to a treatment system and treatment method for wastewater containing low-concentration sulfuric acid. Background technique: [0002] Sulfuric acid is widely used in chemical industry, iron and steel and other industries. In many production processes, the utilization rate of sulfuric acid is low, and a large amount of sulfuric acid is discharged along with wastewater; if these wastewater is discharged into the environment without treatment, it will not only make the water body Or soil acidification, causing harm to the ecological environment, and wasting a lot of sulfuric acid resources; at present, the treatment methods adopted at home and abroad can be roughly divided into three categories: recycling, comprehensive utilization, neutralization treatment; The concentration of sulfuric acid wastewater and the composition of impurities are us...

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Problems solved by technology

[0002] Sulfuric acid is widely used in chemical industry, iron and steel and other industries. In many production processes, the utilization rate of sulfuric acid is low, and a large amount of sulfuric acid is discharged along with wastewater; if these wastewater is discharged into the environment without treatment, it will not only make the water body Or soil acidification, causing harm to the ecological environment, and wasting a lot of sulfuric acid resources; at present, the treatment methods adopted at home and abroad can be roughly divided into three categories: recycling, comprehensive utilization, neutralization treatment; The concentration of sulfuric acid wastewater and the composition of impurities are used to select recovery or treatment methods; especially for waste sulfuric acid or sulfuric acid wastewater produced in the fine chemical industry, due to the extremely complex composition of organic impurities, the concentration of sulfuric acid varies greatly. When the concentration of sulfuric acid is high, it can be recovered and reused after treatment; when the concentration of sulfuric acid is low and the amount of water is large, it is difficult to comprehensively utilize the sulfuric acid because the value of the recovered sulfuric acid is not high, and lime or spent alkali is used for neutralization treatment. Make it reach the discharge standard or be beneficial to follow-up treatment, so there are the following problems: 1, low-concentration sulfuric acid cannot be recycled and reused and cannot be comprehensively utilized, resulting in waste of sulfuric acid, and when treating wastewater containing sulfuric acid, due to the sulfuric acid 2. In terms of comprehensive utilization of sulfuric acid wastewater, the current method is mainly to use ammonia to neutralize waste sulfuric acid to produce ammonium sulfate fertilizer. After obtaining low-concentration ammonium sulfate, it needs to be concentrated and crystallized by an evaporator to form a solid Ammonium sulfate, in this process, due to the low concentration of ammonium sulfate and a large amount of organic matter contained in the wastewater, the evaporator has high energy consumption and easy blockage, which affects the stable operation of the evaporator, and the cost of producing ammonium sulfate is high

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