Method for treating dye production wastewater by adopting magnesium oxide coagulation and Fenton oxidation treatment
A technology for oxidation treatment and production of wastewater, which is applied in special compound water treatment, chemical instruments and methods, water/sewage treatment, etc. To achieve the effect of effective treatment, reduced impact, and price economy
Inactive Publication Date: 2017-06-27
营口东吉科技(集团)有限公司
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Problems solved by technology
However, there are different degrees of disadvantages in the above treatment processes.
Iron-carbon fillers are easily passivated, which leads to a significant decrease in the utilization efficiency of iron-carbon fillers, and the price of iron-carbon fillers is high and the economy is poor
The coagulation method has a limited removal rate for some toxic substances, especially for heavy metals and well-soluble organic substances, and cannot reduce the impact of toxic substances on biochemical systems
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment
[0010] On the Phipps&Bird flocculation beaker experimental mechanical stirrer, take 500mL of wastewater, weigh 2.5g of magnesium oxide and add it to the wastewater to adjust to near neutrality, then add NaOH solution to adjust the pH to 12, and precipitate to realize magnesium oxide coagulation. Fenton oxidation uses ferrous sulfate heptahydrate and hydrogen peroxide, where m(H 2 o 2 ):m(Fe 2+ )=5, by adjusting the pH to 5 to oxidize and remove COD and chroma. Take the wastewater sample in a centrifuge tube, centrifuge, remove the liquid part to measure COD and chromaticity, and then calculate the removal rate. Through the test, the chromaticity and COD removal rates are 69.4% and 47.8% respectively, and the biochemical properties of wastewater are increased by more than 4 times.
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Abstract
The invention discloses a method for treating dye production wastewater by adopting magnesium oxide coagulation and Fenton oxidation treatment. The method comprises the following steps: taking light calcined magnesia as a raw material; adding a certain amount of magnesium oxide into the wastewater; realizing magnesium oxide coagulation by regulating PH; and adding a Fenton oxidizing agent, regulating PH, oxidizing and removing COD and chromaticity. The purity of the light calcined magnesia is 85-92%; the coagulation PH of the adopted coagulation alkaline NaOH solution is 11-12; the adopted Fenton oxidizing agent contains iron vitriol and hydrogen peroxide; m(H2O2):m(Fe2+)=4-6; the suitable value for PH regulation is 3-5. According to the method, the organic content in the dyeing wastewater can be effectively removed, the chromaticity is reduced and the method is suitable for the treatment for the dye production wastewater.
Description
technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a method for treating dye production wastewater by using magnesium oxide coagulation combined with Fenton oxidation. Background technique [0002] Daily-use dye production wastewater is a typical toxic and refractory industrial organic wastewater, and there are high salinity components, which affect the physical, chemical, and biochemical treatment processes in wastewater treatment. [0003] During the actual treatment and research of dye wastewater at home and abroad, it is found that there is an obvious treatment limit in the treatment of dye wastewater by biochemical methods. Factors affecting biochemical treatment include high salinity, high ammonia nitrogen content, and the impact of certain toxic organic substances on biochemical systems. The impact of toxic organic substances on biochemical systems must be reduced through necessary physical and ch...
Claims
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IPC IPC(8): C02F9/04C02F101/30
CPCC02F9/00C02F1/5236C02F1/66C02F1/722C02F2101/308C02F2305/026
Inventor 刘希洋曾凡东林宇
Owner 营口东吉科技(集团)有限公司