Method for treating wastewater

A technology for treating wastewater and wastewater, applied in filtration treatment, water/sewage treatment, chemical instruments and methods, etc., can solve problems such as foul smell, environmental impact, health impact, etc.

Active Publication Date: 2018-08-10
BLUESTAR ADISSEO NANJING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the waste water produced is discharged directly without corresponding treatment, it will not only have a foul smell, but also have a ce

Method used

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  • Method for treating wastewater
  • Method for treating wastewater

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Embodiment 1

[0087] The waste water produced in the production process of methionine hydroxy analogues is transported to a crystallization tank for evaporative crystallization at 57-60° C. to obtain 30-50% by weight of ammonium sulfate crystals, and the crystallized waste water is transported to a storage tank for storage and stirring.

[0088] The wastewater was transported to the Fenton heterogeneous catalytic reactor, and ferrous sulfate (FeSO 4 ·7H 2 O, 20% solution) and hydrogen peroxide (H 2 o 2 , 27.5% solution) mixed solution, Fe 2+ The molar ratio of hydrogen peroxide and hydrogen peroxide is about 1:7, and the molar ratio of hydrogen peroxide and COD in waste water is about 2:1, and the Fenton oxidation reaction is carried out at about 35-40°C for 100 minutes to remove about 35% of COD.

[0089] Send the waste water after Fenton oxidation to the neutralization tank, add alkali (30% sodium hydroxide solution) and adjust the pH to 6-8.

[0090] The neutralized wastewater is sen...

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Abstract

The invention provides a method for treating wastewater. The method comprises the following steps: S1, performing Fenton oxidation, and removing 5-40wt% of CODs through Fenton oxidation, wherein an inflow of a Fenton oxidation reactor comprises a 50-1000ppm methionine hydroxyl analog and an oligomer thereof, 2-100ppm HCN (Hydrogen Cyanide), 1000-8000ppm formic acid, 500-12000ppm CODs (Chemical Oxygen Demands), 5-500ppm NH3-N and one or more of dimethylsulfide, dimethyl dithio, methyl mercaptan, 3-methylthiopropanal, 2-hydroxy-4-methylthio butyronitrile of which the total concentration is 50-1000ppm; S2, adjusting the pH value of the wastewater of Fenton oxidation to 4-8; S3, performing MBBR (Moving Bed Biofilm Reactor) biochemical treatment on the wastewater of which the pH value is adjusted, and removing more than 70wt% of the CODs; S4, performing solid-liquid separation on the wastewater after biochemical treatment; S5, performing reverse osmosis on a fluid after solid-liquid separation, thereby obtaining industrial water and salt water.

Description

technical field [0001] The invention relates to a method for treating waste water, in particular to a method for treating waste water generated in the production of methionine hydroxy analogues, and belongs to the field of waste water treatment. Background technique [0002] In the production process of methionine hydroxy analogues, a large amount of methionine hydroxy analogues industrial wastewater containing ammonium sulfate will be produced, which accounts for 99% of the total discharge of COD in the entire production line, and NH3-N accounts for 99% of the total discharge of COD in the entire production line. For every ton of product produced in the chemical production line, 2-2.5 tons of waste water, 1.5-2 kg of COD, and 0.1-0.15 kg of NH3-N will be produced. When the existing process treats industrial wastewater, the After the waste water is removed by the stripper to remove hydrocyanic acid, it needs to be neutralized by adding sodium hydroxide, and then diluted with...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F101/34C02F101/38
CPCC02F1/001C02F1/441C02F1/5236C02F1/56C02F1/66C02F1/722C02F3/1268C02F9/00C02F2101/34C02F2101/38C02F2305/026
Inventor 朱利安·布泰牛磊
Owner BLUESTAR ADISSEO NANJING CO LTD
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