Chemical microwave treatment method of industrial methyldiethanolamine wastewater

Abstract

The invention relates to a chemical microwave treatment method of industrial methyldiethanolamine wastewater. The method comprises the following steps: (1) providing the methyldiethanolamine wastewater to be treated; (2) aerating the methyldiethanolamine wastewater to be treated by adding an oxidizing agent so as to increase the amount of dissolved oxygen and evenly mix the oxidizing agent with the water body; (3) adding a sensitizing agent and a coagulant and evenly stirring and mixing; (4) performing a concerted reaction on the sensitizing agent and the coagulant under the action of microwaves so as to generate a coagulant with a better adsorption precipitation effect, thereby further enhancing the adsorption precipitation effect; (5) performing sludge and water separation; (6) leading a separated supernatant to be filtered; (7) generating ozone and hydroxyl radicals under the irradiation of a microwave electrodeless lamp so as to further degrade methyldiethanolamine until methyldiethanolamine is mineralized. According to the method, the effective reaction of methyldiethanolamine can be performed on the basis of the functions of microwave energy; the deep treatment on methyldiethanolamine is further performed via the electrodeless photochemical oxidation of the microwaves, so that the problem that the methyldiethanolamine wastewater is difficult to treat is solved.

Description

technical field

[0001] The invention relates to environmental protection technology, in particular to a method for treating industrial wastewater containing methyldiethanolamine. Background technique

[0002] N-methyldiethanolamine (also known as methylethylene glycolamine, abbreviated as MDEA) is a tertiary amine substance. The molecular formula is CH 3 N(CH 2 CH 2 Oh) 2 , the molecular weight is 119.16, the specific gravity is 1.0418, the boiling point is 247°C, the viscosity at 12°C is 101cP, the freezing point is -48°C, and can be completely dissolved in water.

[0003] At present, methyldiethanolamine has been widely used as a desulfurization solvent in natural gas desulfurization, coal gasification desulfurization and refinery desulfurization. MDEA vs H 2 S has high selectivity and low energy consumption, and is used in Claus raw material gas concentration, Scott method tail gas treatment, low calorific value gas desulfurization and other processes.

[0004] MDE...

Examples

Embodiment 1

[0060] Take 2000ml of raw water, measure its pH=9, COD Cr =1080mg / L, the water quality is slightly muddy.

[0061] Put 2000ml of raw water into the water tank, add 2ml of oxidizing agent sodium hypochlorite, turn on the mixer, stir evenly for 1 minute, and the measured pH drops to 7.

[0062] Take 1ml of the prepared diatomite and calcium oxide sensitizer suspension with a mass concentration of 5% and the mass concentration of diatomite and calcium oxide are both 2.5%, add it to the waste water, turn on the mixer, and stir evenly for 30 seconds , the measured pH rose to 11.

[0063] Take 1ml of the prepared polyferric sulfate coagulant solution, the concentration of which is 5%, add the mixed solution, turn on the mixer, stir evenly for 30 seconds, and the measured pH drops to 8.

[0064] Turn on the lifting small liquid pump, start the microwave equipment at the same time, introduce the mixed liquid into the microwave processing equipment, and the liquid will come out after...

Embodiment 2

[0069] Dilute the MDEA wastewater to be treated until the COD is around 1000mg / L.

[0070] Add a sodium hypochlorite solution with a concentration of 10% into the aeration box at a volume ratio of 1:1000, and simultaneously aerate the box to maintain a stable aerosol ratio and aeration time.

[0071] Introduce the waste water into the mixing tank, add 5% diatomite and calcium oxide mixed sensitizer solution to the waste water, its volume is 1 / 2000 of the waste water volume, add 5% polyferric sulfate mixed Coagulant solution, whose volume is 1 / 2000 of the waste water volume, continue to stir and mix until uniform, because the solution of the sensitizer itself is alkaline, and the solution of the coagulant itself is acidic, like this, the MDEA to be entered into the microwave reactor The pH of the wastewater is controlled to be neutral.

[0072] The mixed wastewater enters the microwave sensitization reactor with a microwave power of 1.6kW, and the wastewater stays there for 20...

technical field

[0001] The invention relates to environmental protection technology, in particular to a method for treating industrial wastewater containing methyldiethanolamine. Background technique

[0002] N-methyldiethanolamine (also known as methylethylene glycolamine, abbreviated as MDEA) is a tertiary amine substance. The molecular formula is CH 3 N(CH 2 CH 2 Oh) 2 , the molecular weight is 119.16, the specific gravity is 1.0418, the boiling point is 247°C, the viscosity at 12°C is 101cP, the freezing point is -48°C, and can be completely dissolved in water.

[0003] At present, methyldiethanolamine has been widely used as a desulfurization solvent in natural gas desulfurization, coal gasification desulfurization and refinery desulfurization. MDEA vs H 2 S has high selectivity and low energy consumption, and is used in Claus raw material gas concentration, Scott method tail gas treatment, low calorific value gas desulfurization and other processes.

[0004] MDE...

Examples

Embodiment 1

[0060] Take 2000ml of raw water, measure its pH=9, COD Cr =1080mg / L, the water quality is slightly muddy.

[0061] Put 2000ml of raw water into the water tank, add 2ml of oxidizing agent sodium hypochlorite, turn on the mixer, stir evenly for 1 minute, and the measured pH drops to 7.

[0062] Take 1ml of the prepared diatomite and calcium oxide sensitizer suspension with a mass concentration of 5% and the mass concentration of diatomite and calcium oxide are both 2.5%, add it to the waste water, turn on the mixer, and stir evenly for 30 seconds , the measured pH rose to 11.

[0063] Take 1ml of the prepared polyferric sulfate coagulant solution, the concentration of which is 5%, add the mixed solution, turn on the mixer, stir evenly for 30 seconds, and the measured pH drops to 8.

[0064] Turn on the lifting small liquid pump, start the microwave equipment at the same time, introduce the mixed liquid into the microwave processing equipment, and the liquid will come out after...

Embodiment 2

[0069] Dilute the MDEA wastewater to be treated until the COD is around 1000mg / L.

[0070] Add a sodium hypochlorite solution with a concentration of 10% into the aeration box at a volume ratio of 1:1000, and simultaneously aerate the box to maintain a stable aerosol ratio and aeration time.

[0071] Introduce the waste water into the mixing tank, add 5% diatomite and calcium oxide mixed sensitizer solution to the waste water, its volume is 1 / 2000 of the waste water volume, add 5% polyferric sulfate mixed Coagulant solution, whose volume is 1 / 2000 of the waste water volume, continue to stir and mix until uniform, because the solution of the sensitizer itself is alkaline, and the solution of the coagulant itself is acidic, like this, the MDEA to be entered into the microwave reactor The pH of the wastewater is controlled to be neutral.

[0072] The mixed wastewater enters the microwave sensitization reactor with a microwave power of 1.6kW, and the wastewater stays there for 20...

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