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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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

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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PUM

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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

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Claims

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Application Information

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Owner 吕梁广汇生物科技股份有限公司
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