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Advanced waste water treatment method

A wastewater treatment and wastewater technology, which is applied in the fields of water/sewage multi-stage treatment, oxidized water/sewage treatment, water/sludge/sewage treatment, etc. Long time and other problems, to achieve the effect of reducing the amount of production and improving the oxidation rate of Fenton

Active Publication Date: 2010-07-28
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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Problems solved by technology

However, the Fenton process also has the following disadvantages: the optimal pH range of the reaction is low (3-3.5), the amount of ferrous iron added is large, the concentration of ferrous ferrous with catalytic activity is low in the reaction, the amount of sludge generated is large, and the hydraulic retention time is long.

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Embodiment 1

[0019] Embodiment 1, processing pharmaceutical waste water

[0020] The sewage from a pharmaceutical industrial park in China was taken for testing. The quality of raw water is shown in Table 1. From Table 1, it can be seen that this sewage has the characteristics of low COD (chemical oxygen demand), medium concentration of ammonia nitrogen and poor biochemical properties. use figure 2 The process flow shown is to treat the pharmaceutical wastewater. First, adjust the alkalinity of the sewage to less than 10mg / L in terms of calcium carbonate, add 5mg of anthraquinone per liter of sewage, enter the Fenton (mixed solution of hydrogen peroxide and ferrous iron) reaction tank, and stir under air Add hydrogen peroxide and ferrous sulfate, the amount of hydrogen peroxide added is 0.5 times (50-60mg / L) of the concentration of influent COD, the amount of ferrous sulfate added is 10.0 mg / L in terms of ferrous ions, and the air stirring The gas-water ratio is 5:1 (volume ratio). Aft...

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Abstract

The invention discloses an advanced waste water treatment method which comprises the following steps of: 1) using acid to adjust the alkalinity of waste water so as to lead the alkalinity of the waste water to be less than 100mg / L based on calcium carbonate, and then adding catalyst into the waster water, wherein the catalyst is compound containing enol group or quinones compound; 2) stirring the waste water treated by the step 1) in the air, and then adding H2O2 and ferrite for oxidizing reaction; and 3) after the reaction, adjusting the pH value of reaction liquid to be 6-9, adding flocculating agent, leading the reaction liquid to be mixed with the flocculating agent for solid-liquid separation, removing impurities inside water, and obtaining the waste water which is in accordance with the discharge standard. The method improves the Fenton oxidation rate, and reduces the ferrous adding quantity and the generating quantity of sludge.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a wastewater advanced treatment method for improving the Fenton oxidation rate. Background technique [0002] With the increase in the concentration of biodegradable organic pollutants in the process of sewage discharge and the need for advanced treatment of sewage, advanced oxidation technology for the purpose of improving the removal of organic matter in sewage or improving its biodegradability has been widely used. Among these advanced oxidation processes, Fenton (H 2 o 2 +Fe 2+ ) oxidation is the most representative. Due to its high-efficiency oxidation characteristics, low operation and investment costs, it is widely used in advanced sewage treatment and biochemical improvement. However, the Fenton process also has the following disadvantages: the optimal pH range of the reaction is low (3-3.5), the amount of ferrous iron added is large, the concentration ...

Claims

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Application Information

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IPC IPC(8): C02F9/08C02F1/72C02F1/56
Inventor 高迎新丁然杨敏张昱
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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