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A method for recovering lactic acid from marigold flower fermentation wastewater

A technology for fermenting waste water and marigold flowers, applied in chemical instruments and methods, separation/purification of carboxylic acid compounds, multi-stage water/sewage treatment, etc., can solve the problems of severe pollution of marigold flower fermentation waste water, and achieve broad prospects for industrialization , Environmental friendliness, and the effect of reducing emissions

Inactive Publication Date: 2011-11-30
吕梁广汇生物科技股份有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a method for recovering lactic acid from marigold flower fermentation wastewater, on the one hand to solve the technical problem of lactic acid recovery in low-content lactic acid solution, and on the one hand to solve the environmental protection problem of heavy pollution of marigold flower fermentation wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 4 tons of marigold flower fermentation waste water with 2.8% lactic acid content was pumped into 5m with a centrifugal pump 3 In the reaction kettle, slowly add 40 L of colloid solution prepared with 4 kg of polymer flocculant polyacrylamide 801 under stirring, and stir at 120 rpm for 1 hour.

[0029] After the flocculation treatment, the fermented wastewater enters the horizontal screw centrifugal settler with a separation factor of 6000 by gravity at a high level. After separating the clear and transparent liquid, 210kg of solid sediment is collected at the solid discharge port for the preparation of organic fertilizers.

[0030] Transport the clear and transparent material liquid to the decolorization kettle with a centrifugal pump, preheat to 50°C, add 40kg of activated carbon, stir for 1 hour for decolorization, then enter the plate and frame filter for pressure filtration, and the pressure is controlled at 4.5kgf / cm 2 , The filter cloth adopts 200 mesh specificati...

Embodiment 2

[0036] Pump 8 tons of marigold flower fermentation wastewater with 4.2% lactic acid into the 10m 3 In a reaction kettle, slowly add 100 L of colloid solution prepared with 10 kg of polymer flocculant polyacrylamide 801 under stirring, and stir at 120 rpm for 1 hour.

[0037]The fermented waste water after flocculation treatment passes through a horizontal screw centrifugal settler with a separation factor of 6000 to separate the clear and transparent feed liquid, and collect 430kg of solid sediment at the solid discharge port for the preparation of organic fertilizers.

[0038] Transport the clear and transparent material liquid to the decolorization kettle with a centrifugal pump, preheat it to 60°C, add 80kg of activated carbon, stir and decolorize for 1 hour, then enter the plate and frame filter for pressure filtration, and the pressure is controlled at 5kgf / cm 2 , The filter cloth adopts 200 mesh specifications, and the filtered transparent and colorless material liquid e...

Embodiment 3

[0044] 14 tons of marigold flower fermentation wastewater with a lactic acid content of 5.5% was pumped into the 15m 3 In the reaction kettle, slowly add 150 L of colloid solution prepared with 13 kg of polymer flocculant polyacrylamide 801 under stirring, and stir at 120 rpm for 1 hour.

[0045] The fermented waste water after flocculation treatment passes through a horizontal screw centrifugal settler with a separation factor of 6000 to separate the clear and transparent feed liquid, and collects 690kg of solid sediment at the solid discharge port for the preparation of organic fertilizers.

[0046] Transport the clear and transparent material liquid to the decolorization kettle with a centrifugal pump, preheat it to 50°C, add 120kg of activated carbon, stir and decolorize for 1 hour, then enter the plate and frame filter for pressure filtration, and the pressure is controlled at 4.5kgf / cm 2 , The filter cloth adopts 200 mesh specifications, and the filtered transparent and ...

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Abstract

The invention provides a method for recovering lactic acid from marigold fermentation wastewater. The method comprises the following steps: purifying marigold fermentation wastewater used as an initial raw material by using a polymer flocculation settling technology and a centrifugal settling technology to remove suspended solids in the wastewater; then decolorizing and filtering the purified wastewater with activated carbon by using an adsorption method to obtain a pure and colorless purified liquid; and finally concentrating the low-concentration solution with a lactic acid content of 3-5wt% through two-stage decompressing spray evaporation until the lactic acid content is more than 50wt%, wherein the evaporation wastewater generated in the concentration process is simultaneously subjected to aeration treatment to reduce the COD (chemical oxygen demand), thus meeting the national second-level emission standard. Through the method provided by the invention, lactic acid is recovered from the fermentation wastewater with a low lactic acid content, thereby changing waste into valuable, and solving the environment-friendly treatment problem of the marigold fermentation wastewater. Thus, the marigold processing industry can be sustainably developed.

Description

technical field [0001] The invention relates to a method for recovering lactic acid, in particular to a method for recovering lactic acid from marigold flower fermentation wastewater. The invention processes the marigold flower fermentation wastewater while recovering lactic acid to make it meet the national secondary discharge standard. Background technique [0002] my country's marigold planting industry began in 1993. After 18 years of development, the planting area has basically remained at the level of 200,000 mu, covering Heilongjiang, Jilin, Liaoning, Hebei, Inner Mongolia, Shanxi, Shaanxi, Ningxia, Gansu, Xinjiang, More than a dozen provinces and autonomous regions including Yunnan have become the world's largest planters of marigolds, accounting for 95% of the world's total plantings. The vigorous development of marigold flower planting industry has also greatly promoted the rough processing and deep processing industry of marigold flowers, which has brought huge imp...

Claims

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Application Information

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IPC IPC(8): C07C59/08C07C51/42C02F9/10
Inventor 张慧霍清祥张天依李涛王冉冉张祥敏张万青王延霞王丽娟
Owner 吕梁广汇生物科技股份有限公司
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