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A method for microwave-enhanced iron-carbon combined with microwave oxidation to treat oily wastewater

A microwave catalytic oxidation, iron-carbon technology, applied in chemical instruments and methods, water/sewage treatment, water/sewage multi-stage treatment, etc., can solve problems such as ineffective COD removal and failure to meet national oily wastewater discharge standards , to achieve the effect of improving microwave utilization, shortening reaction time and reducing cost

Active Publication Date: 2016-01-20
CNOOC TIANJIN CHEM RES & DESIGN INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The traditional "oil separation-filtration" or "oil separation-flotation (or cyclone degreasing)-filtration" process has a certain effect on removing oil and suspended soli

Method used

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  • A method for microwave-enhanced iron-carbon combined with microwave oxidation to treat oily wastewater

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Effect test

Embodiment 1

[0029] According to the process of the present invention, a certain oily wastewater is processed, and the reaction conditions are as follows: first, the iron-carbon is pretreated: the first step is to rinse the activated carbon with tap water for 4 hours, and after rinsing, the activated carbon is dried and sealed; Soak in oily wastewater for 30 minutes, first make the adsorption of pollutants by activated carbon reach saturation, and then use industrial alkali and dilute hydrochloric acid to clean the oil stains and oxides adhering to the surface of iron filings in sequence, then wash them with tap water, dry them, and seal them for later use. use; then, mix the pretreated iron-carbon at 8:2, add 25% of the waste water into the waste water after mixing, pH 2.5, microwave output power 400W, reaction time 8 minutes; In the medicine separation and precipitation process, the aluminum-iron composite flocculant and polymer flocculant are added according to the wastewater volume of 0...

Embodiment 2

[0032] According to the flow process of the present invention, a certain oily wastewater is processed, and the reaction conditions are as follows: first, the iron carbon is pretreated: the first step is to rinse the activated carbon with tap water for 4 hours to prevent the interference of carbon black and other impurities, and dry the activated carbon after washing , seal; treat waste water with relevant oily waste water before use for 30 minutes, first make the adsorption of activated carbon on pollutants reach saturation, the second step is to clean the oil and oxides adhering to the surface of iron filings with industrial alkali and dilute hydrochloric acid in turn, and then use Wash with tap water, dry, and seal for use; then, mix the pretreated iron-carbon at 9:1, add 20% of the waste water into the waste water after mixing, pH 2.5, microwave output power 450W, The reaction time is 10 minutes; the microwave effluent enters the dosing separation and precipitation process, ...

Embodiment 3

[0036] According to the process of the present invention, a certain oily wastewater is processed, and the reaction conditions are as follows: first, the iron-carbon is pretreated: the first step is to rinse the activated carbon with tap water for 4 hours, and after rinsing, the activated carbon is dried and sealed; Soak in oily wastewater for 30 minutes, first make the adsorption of pollutants by activated carbon reach saturation, and then use industrial alkali and dilute hydrochloric acid to clean the oil stains and oxides adhering to the surface of iron filings in sequence, then wash them with tap water, dry them, and seal them for later use. use; then, mix the pretreated iron-carbon according to 8.5:1.5, and add 30% of the waste water into the waste water after mixing, pH 2, microwave output power 500W, reaction time 15 minutes; microwave effluent enters dosing separation In the sedimentation process, the aluminum-iron composite flocculant and polymer flocculant are added ac...

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Abstract

The invention discloses a method for treating oily wastewater discharge by combining microwave enhanced iron carbon treatment with microwave oxidation. The method is characterized by comprising the following steps: (1) performing pretreatment on activated carbon and scrap iron by adopting a pretreatment process; (2) treating oily wastewater by adopting microwave catalytic enhancement iron carbon micro-electrolysis reaction; (3) putting the oily wastewater subjected to microwave enhanced iron carbon treatment into a dosing separation system; (4) enabling the wastewater treated by the dosing separation system to perform a microwave catalytic oxidation process; and (5) treating effluent and discharging the effluent on standard. A process disclosed by the invention is used for treating the oily wastewater by adopting the microwave catalytic oxidation process at the back end of a conventional 'microwave enhanced iron carbon pretreatment and flocculation dosing' treatment method, can further perform catalytic oxidation by virtue of two-stage microwaves, can be used for improving the utilization rate of the microwaves and ensuring the stability of the effluent, and ensures that the water quality of the effluent of the overall process is stable and can meet the up-to-standard discharge requirements for a long term.

Description

technical field [0001] The invention relates to industrial water treatment technology, in particular to a method for microwave-enhanced iron-carbon combined with microwave oxidation to treat oily wastewater, and the treated water reaches the discharge standard. Background technique: [0002] The traditional "oil separation-filtration" or "oil separation-flotation (or cyclone degreasing)-filtration" process has a certain effect on removing oil and suspended solids in wastewater, but for the COD produced by soluble oil in wastewater The removal effect is not obvious, and it cannot meet the national discharge standards for oily wastewater. [0003] In recent years, due to the thermal effect of microwave and its induced catalysis, which can speed up the chemical reaction rate, shorten the reaction time, and have the advantages of no pollution, simple equipment, and small footprint, many scholars have applied microwave technology to the treatment of oily wastewater and achieved g...

Claims

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Application Information

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IPC IPC(8): C02F9/08
CPCC02F1/302C02F1/461C02F1/52C02F1/725C02F9/00
Inventor 张莹霍莹杨勇付连超郑贝贝张艳芳
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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