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Pretreatment method of biodiesel wastewater

A biodiesel and pretreatment technology, applied in water/sewage treatment, natural water body treatment, water treatment parameter control, etc., can solve problems such as low efficiency, pollution, and long degradation time, so as to reduce difficulty, reduce difficulty, improve efficiency effect

Inactive Publication Date: 2017-05-31
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The above-mentioned processes can solve the problem of biodiesel wastewater pollution, but due to the high content of organic matter in biodiesel and a certain amount of oil, it takes a long time to degrade. Some enterprises need 1 to 2 times to degrade once, and the efficiency is low.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 1) Micro electrolysis

[0048] Take 100mL of biodiesel wastewater, add 40g of aluminum and carbon in the ratio of aluminum: carbon = 1:0.8, and pass in 15mL / min of air. Microelectrolyze at 35℃ for 24h, filter, and treat the reacted aluminum strips and activated carbon particles. Carry out repeated rinsing. If necessary, treat the activated carbon with acid, dry it, and use it for the next test.

[0049] In this process, the aluminum is required to be made into an aluminum sheet with a width of 10mm and a length of 40mm. The activated carbon particles are 3mm or a graphite sheet with a thickness of 1.5mm and the length and width of the aluminum strip is basically the same.

[0050] 2) Flocculation sedimentation:

[0051] To the filtrate (biological wastewater) obtained in step 1), slowly add lime milk with a concentration of 10% under constant stirring, adjust the pH of the wastewater to 4.5, and after stirring for 20 minutes, slowly add 5 mL of concentration It is 1% polyalumi...

Embodiment 2

[0054] 1) Micro electrolysis

[0055] Take 100mL of biodiesel wastewater, add 50g of aluminum and carbon / 100mL according to the ratio of aluminum: carbon = 1:1, pass in 18mL / min of air, microelectrolyze at 40℃ for 18h, filter, and treat the reacted aluminum strip, The activated carbon particles are rinsed and used for the next test.

[0056] In this process, the aluminum is required to be made into an aluminum sheet with a width of 12mm and a length of 50mm. The activated carbon particles are 3mm or a graphite plate with a thickness of 2mm and the same length and width as the aluminum strip.

[0057] 2) Flocculation sedimentation:

[0058] To the filtrate (biological wastewater) obtained in step 1), slowly add lime milk with a concentration of 15% under constant stirring, adjust the pH of the wastewater to 4.8, and after stirring for 25 minutes, slowly add 8mL concentration It is 1% polyaluminum chloride, and then 1 mL of 0.1% polyacrylamide is added, and first stir at 280 rpm for 8 ...

Embodiment 3

[0061] Take 100mL of biodiesel wastewater, add 60g of aluminum, carbon / in the ratio of aluminum: carbon = 1:1.2, pass in 20mL / min of air, microelectrolyze at 45℃ for 24h, filter, and treat the reacted aluminum strips and activated carbon The particles are rinsed and used for the next test.

[0062] In this process, aluminum is required to be made into an aluminum sheet with a width of 10mm and a length of 45mm. The activated carbon particles are 2.5mm or a graphite plate with a thickness of 2mm and the same length and width as the aluminum strip.

[0063] 2) Flocculation sedimentation:

[0064] To the filtrate (biological wastewater) obtained in step 1), slowly add lime milk with a concentration of 12% under constant stirring, adjust the pH of the wastewater to 5.0, and after stirring for 25 minutes, slowly add 8mL concentration It is 1% polyaluminum chloride, and then 1 mL of 0.1% polyacrylamide is added, and first stir at 300 rpm for 10 minutes, and then at 30 rpm for 30 minutes....

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Abstract

The invention discloses a pretreatment method of biodiesel wastewater. The pretreatment method comprises the following steps of 1, microelectrolysis: adding an aluminum strip and activated carbon particles into the biodiesel wastewater, continuously filling air, reacting for 18 to 24h at the temperature of 35 to 45 DEG C, and filtering after reaction is finished, so as to obtain filtrate and the reacted aluminum strip and activated carbon particles; (2) flocculating and settling: adding an alkaline solution into the filtrate obtained in step (1), adjusting the pH (potential of hydrogen) value to 4.5 to 5.0, fully stirring, adding 1% polymeric aluminum water solution, and then adding 0.1% polyacrylamide, wherein the volume percentage of polymeric aluminum water solution accounts for 5 to 10% of the volume of the biodiesel wastewater, and the volume percentage of polyacrylamide accounts for 0.8 to 1.2% of the volume of the biodiesel wastewater; fully stirring to form a flocculating and settling substance, standing, and filtering, so as to obtain a colorless or light yellow transparent liquid. The pretreatment method has the advantages that the difficulty in biological treatment is greatly decreased, and the treatment efficiency of wastewater is improved.

Description

[0001] 【Technical Field】 [0002] The invention belongs to the field of wastewater pretreatment, and in particular relates to a biodiesel wastewater pretreatment method. [0003] 【Background technique】 [0004] Biodiesel, also known as fatty acid methyl ester, is made from oil crops, wild oil plants, engineered microalgae and other aquatic plant fats, animal fats, and catering garbage oil as raw material oils that can replace petrochemical diesel. Renewable diesel fuel. Biodiesel is a kind of biomass energy. It is a long-chain fatty acid monoalkyl ester obtained by biomass pyrolysis and other technologies. It has good lubricity and low sulfur content. Biodiesel is a mixture of complex organic components with extremely high oxygen content. These mixtures are mainly organic substances with large molecular weights, including almost all kinds of oxygen-containing organic substances, such as ethers, aldehydes, ketones, phenols, organic acids, alcohols, etc. Composite biodiesel uses wast...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F103/36
CPCC02F9/00C02F1/001C02F1/461C02F1/56C02F1/66C02F2103/36C02F2209/08
Inventor 陈丽卢瑞蔺旺梅抗新新李祥
Owner SHAANXI UNIV OF SCI & TECH
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