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Treatment method for industrial wastewater

A technology for industrial wastewater and treatment methods, applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve mass transfer resistance, increase operating load, block ammonia stripping equipment and Pipeline and other problems to achieve the effect of reduced mass transfer resistance, reduced operating costs, reduced power consumption and heat consumption

Active Publication Date: 2015-05-06
北京潮白环保科技股份有限公司
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, provide a kind of treatment method of industrial waste water containing high-concentration ammonium sulfate waste water, effectively reduce the concentration of sulfate radical and ammonia nitrogen concentration in the waste water, the introduction of sodium carbonate is beneficial to remove residual in the waste water at the same time A large amount of calcium ions, thus solving the problems faced by conventional precipitation methods, such as calcium sulfate scaling, blocking ammonia stripping equipment and pipelines, causing mass transfer resistance, and increasing operating loads

Method used

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Embodiment 1

[0030] Embodiment 1 Contrast test of conventional precipitation treatment method and treatment method of the present invention

[0031] Taking the ammonium sulfate wastewater produced by a certain pharmaceutical company as the test object, the test is divided into two groups, namely the control group and the test group. "Primary precipitation, replacement reaction, secondary precipitation, ammonia stripping, ammonia recovery" treatment process, the comparative test results are shown in Table 1

[0032] Table 1: Comparative test results comparison

[0033]

[0034] From the data in Table 1, the following conclusions can be drawn:

[0035] Under the premise that the total mass of the dosage of the two groups of chemicals is the same, that is, the amount of quicklime powder in the control group is equal to the amount of SO in wastewater 4 2- The mass concentration ratio is 1.93, and the amount of quicklime powder in the experimental group is equal to that of SO in wastewate...

Embodiment 2

[0036] Embodiment 2 The pilot test of method of the present invention processing ammonium sulfate waste water

[0037] Ammonium sulfate wastewater from a chemical company was taken for pilot test. The wastewater SO 4 2- The concentration is 5500mg / L, NH 3 -N concentration is 2650mg / L, COD concentration is 4232mg / L, pH is 3.0, the test process is as follows:

[0038] The ammonium sulfate wastewater enters the primary sedimentation tank, and 6.5g / L of quicklime powder is added, and the stirring is started for reaction. After 20 minutes of reaction, the stirring is turned off, and the precipitation is allowed to stand for 1 hour. The generated calcium sulfate precipitates at the bottom of the tank, and the supernatant enters the replacement Reaction tank; Add 3.5g / L of sodium carbonate to the replacement reaction tank, turn on the stirring for the replacement reaction, turn off the stirring after 30 minutes of reaction, the waste water enters the secondary sedimentation tank, a...

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Abstract

The invention belongs to the field of sewage treatment, and relates to a treatment method for industrial wastewater. The method comprises steps of primary precipitation, replacement reaction, secondary precipitation, ammonia stripping and ammonia recycling; removal rate to sulfate radicals in industrial wastewater is up to 80%, removal rate to ammonia nitrogen is up to 90%; the method is particularly applicable to treatment of high-concentration ammonium sulfate wastewater, meanwhile, solves the difficult problem that calcium sulphate scaling blocks equipment and pipelines and increases operation load in the conventional precipitation methods.

Description

technical field [0001] The invention belongs to the field of sewage treatment and relates to a treatment method for industrial waste water, in particular to a treatment method for ammonium sulfate waste water. Background technique [0002] A large amount of high-concentration ammonium sulfate wastewater will be produced in chemical, pharmaceutical, papermaking and other industrial production processes. The concentration of sulfate and ammonia nitrogen in this type of wastewater is too high. If it is not properly treated and discharged into the water body, it will inevitably cause serious pollution to the environment. High-concentration ammonium sulfate wastewater is not suitable for biological treatment because of its high sulfate concentration and ammonia nitrogen concentration. [0003] At present, the pretreatment methods for high-concentration ammonium sulfate wastewater include evaporation crystallization, cooling crystallization, conventional precipitation, and ammonia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C01C1/242
Inventor 匡开宇
Owner 北京潮白环保科技股份有限公司
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