CN110577273A

CN110577273A - Decolorization and deodorization of marigold silage fermentation liquor and utilization thereof

Info

Publication number: CN110577273A
Application number: CN201910955438.8A
Authority: CN
Inventors: 林劲冬; 陶正国; 明远
Original assignee: GUANGZHOU LEADER BIO-TECHNOLOGY Co Ltd; Pengyang Lidar Agricultural Development Co Ltd
Current assignee: GUANGZHOU LEADER BIO-TECHNOLOGY Co Ltd; Pengyang Lidar Agricultural Development Co Ltd
Priority date: 2019-10-09
Filing date: 2019-10-09
Publication date: 2019-12-17

Abstract

The decolorization, deodorization and utilization of marigold silage fermentation liquor are characterized in that: alkaline earth metal peroxide is used as an oxygen source, the alkaline earth metal peroxide reacts with acidic black stink fermentation waste liquid obtained by marigold anaerobic fermentation at normal temperature for 1-24 hours under the synergistic action of water-soluble inorganic salt containing ferrous ions, the obtained liquid is neutralized and filtered, and the filtrate is colorless to light yellow clear liquid with tasteless to light fragrance and can be directly used as a soil fertility conditioner or a soil nematode inhibitor.

Description

Decolorization and deodorization of marigold silage fermentation liquor and utilization thereof

Technical Field

The invention relates to a method for treating plant fermentation waste liquid, in particular to a harmless treatment method of marigold fermentation squeezing waste liquid, belonging to the technical field of water treatment.

Background

Marigold is an annual herbaceous plant and is an ideal source for extracting natural pigment lutein. In the process of collection, storage and extraction of marigold flowers, the marigold flowers need to undergo the process steps of fermentation ensiling, squeezing dehydration, drying, granulation and the like, wherein the fermentation ensiling and the squeezing dehydration generate a large amount of fermentation waste liquid. The waste liquid contains a large amount of lactic acid, humic acid, amino acid, syringic acid and other organic matters, the pH value is in the range of 3-6, the BOD and the COD of the waste liquid are very high, and the waste liquid has strong stink, and the industry has not found a simple and scientific method for carrying out harmless treatment on the waste liquid, so that a plurality of beneficial components carried by the fermentation liquid are wasted, and potential resources are qualitatively polluted.

We have measured the nutrient contents of marigold planted in Yunnan, Ningxia and other areas, and the results are as follows: 45-51% of water, 4-5% of crude fat, 3-4% of ash, 2-3% of crude protein, 5-6% of crude fiber, 35-37% of total sugar, 1-2% of carotenoid and 0.4-0.6% of amino acid. The content of glutamic acid in amino acid is the highest, and reaches the level of 0.1-0.2%. In addition, marigold flower is found to contain gallic acid, 4-dihydroxy-5-methoxybenzoic acid, quercitrin, dulcitol, alpha-trithiophene, and the like. Water extracts of marigold flowers have been shown by many studies to have significant nematode resistance. Research reports that the tomato is watered with the water extract of marigold flowers, and the tomato has obvious inhibition effect on various insect pests and plant diseases.

Because the fresh marigold flowers are rich in sugar, the fresh marigold flowers can provide a good nutrient source for fermentation. The fresh-keeping and wall breaking are carried out through the combined action of the lactic acid bacteria and the cellulase in the ensiling fermentation link, the storage life of the flowers is prolonged, and the difficulty of pigment extraction is also reduced.

In the ensiling fermentation process, partial liquid contained in the fresh flowers is separated from solid matters under the action of gravity to generate a first part of fermentation waste liquid. After ensiling, the fermentation broth is further pressed in order to prepare dried particles for solvent extraction, and the fermentation broth is further separated from the dry matter, yielding a second, and most important, fraction of fermentation broth.

Performing chemical analysis on the fermentation waste liquid, wherein the pH value is 3.5-6, the fermentation waste liquid contains a large amount of lactic acid, amino acid, humic acid and syringic acid, and the Chemical Oxygen Demand (COD)_CrUp to tens or even hundreds of thousands.

The Fenton reagent oxidation treatment of organic wastewater is an important method in the water treatment industry. In the domestic report, calcium hydroxide is used for neutralizing acidic wastewater in the marigold sewage treatment link in advance, and a Fenton method, namely a hydrogen peroxide/ferrous sulfate combined oxidation method, is combined with ultraviolet irradiation after filtration to oxidize the marigold fermentation wastewater, so that the foul smell of the fermentation wastewater can be effectively reduced, and the content of harmful bacteria can be greatly reduced. However, this method requires the use of a large amount of hydrogen peroxide, which on the one hand increases the total amount of waste water and on the other hand, the oxygen evolution of hydrogen peroxide is more vigorous under the influence of iron ions. In large-scale operation, because the fluctuation of the organic matter content in the marigold fermentation waste liquid to be treated is large, the dosage of hydrogen peroxide is difficult to be effectively controlled, and the treatment of the later-stage waste water is also influenced. The principle of the process is worth referencing, but this method is also immature for high COD fermentation wastewater. The technology and process need to be improved and optimized for the harmless treatment of marigold fermentation waste liquid.

At present, several patent technologies exist for the treatment of marigold fermentation waste liquid.

Chinese patent CN201110298841.1 discloses a treatment method of marigold waste liquid, which comprises mixing the waste liquid with water-absorbing substances and biological bacteria, and further performing fermentation reaction to obtain organic fertilizer. The water-absorbing substance comprises biomass, feces, grass peat and the like. The method effectively utilizes the marigold waste liquid, but needs to transport huge amount of marigold waste liquid to an organic fertilizer plant, the transportation cost is very high, and the leakage of acid and odorous liquid generated in the transportation process also has certain influence on the environment. Chinese patent CN201410283919.6 discloses another treatment method of marigold waste liquid, which is to add potassium hydroxide to neutralize the waste liquid, and then to continue to ferment in a fermentation tank for more than 1 month after neutralization, so as to obtain the liquid organic fertilizer. The liquid organic fertilizer obtained by the method is stated to be used as a root fixing fertilizer for planting marigold, each plant is irrigated with 1kg, and the liquid organic fertilizer can also be used as root fixing water for a corn and potato thin film planting method, and each pond is irrigated with 0.5 kg. The organic liquid fertilizer can also be mixed with dry farmyard manure until water is squeezed by hands, and the organic liquid fertilizer can be used after being fermented for 1 month. Nitrogenous fertilizers, such as ammonium bicarbonate or urea, can also be dissolved in the organic liquid fertilizer to irrigate crops together. The liquid organic fertilizer obtained by the method still has extremely rancid smell, and a large amount of mixed bacteria are remained, so that the liquid organic fertilizer possibly causes unknown damage to ecology and crop illumination. Chinese patent CN201410225056.7 discloses a method for comprehensively treating marigold squeezed sewage, which comprehensively treats marigold squeezed wastewater through precipitation, aeration, anaerobic fermentation, decolorization and artificial wetland, and because of adopting the mode of natural degradation of the artificial wetland, the effluent requirement is reduced, the cost of physicochemical-biochemical treatment of waste liquid is reduced, but the artificial wetland has large floor area and long natural degradation time, is not suitable for large-scale marigold processing plants, and at the present that land resources are increasingly tense, the method is not suitable for a moment, and is difficult to overcome the drainage law requirement of partial water source protection areas.

Chinese patent CN201710611295.X discloses a treatment method of marigold flower fermentation liquor, wherein fermentation waste liquor is mixed with potassium hydroxide, organic carbon bacterial liquid and bacillus coagulans, aeration is carried out for 5-10 days, and the liquid is obtained after solid-liquid separation, namely organic nutrient solution. The method converts macromolecular organic matter into small molecular water soluble compound, which can be absorbed by plants. Chinese patent CN201910244384.4 discloses a method for preparing a flower mud fertilizer, which comprises neutralizing with potassium hydroxide to neutrality, separating precipitate, mixing the upper liquid with chrysanthemum residue and potassium fertilizer, fermenting in a fermentation tank for 15 days, and turning over once every 6-8 days. The method has the advantages of solid-liquid mixing, high labor intensity, limitation to the source of the chrysanthemum residue, and difficulty in treating large-scale marigold fermentation waste liquid. In addition, the marigold extraction residual chrysanthemum residue is utilized as a feed raw material for supplementing a small amount of lutein, and is not suitable for being used as a flower mud fertilizer with low utilization value. The flower mud fertilizer obtained by the method has no improvement on smell, is still in a foul state, and simultaneously has a large amount of mixed bacteria remained in the product, so that the product is directly applied to farmlands and is easy to generate biological pollution.

As mentioned above, the marigold fermentation waste liquid contains various nematode-resistant substances, such as alpha-terthiophene components, and a large amount of substances capable of improving soil fertility, such as humic acid, amino acid and the like. If measures can be taken and used, the marigold fermentation waste liquid can be changed into a resource material for improving the land and can be used. The invention adopts a novel technical means, and obtains the liquid soil conditioner which has the functions of resisting nematodes, increasing the content of organic matters and improving the ecology of soil flora in saline-alkali soil by decolorizing and deodorizing through an improved oxidation method on the basis of not increasing the water content of the fermentation waste liquid without adding nutrition.

Disclosure of Invention

The invention uses calcium peroxide, magnesium peroxide powder or particles as the source of hydrogen peroxide or hydroxyl free radicals, and does not increase the volume of waste water. And the calcium peroxide can release hydrogen peroxide only in a dissolved state, so that the loss and volatilization of oxygen are reduced, the solubility of the calcium peroxide is improved along with the reduction of the pH value, and the calcium peroxide can play a stronger oxidation effect under the condition that the waste liquid is acidic.

The invention relates to a method for treating colored malodorous waste liquid with controllable oxidation speed and super strong decoloration and deodorization capacity by utilizing the self acidity of fermentation waste liquid and calcium peroxide in the presence of iron ions. No extra water is brought in the oxidation treatment process, and the clear and transparent multipurpose soil conditioner with slight fragrance can be obtained after the liquid obtained by the oxidation treatment is simply settled. The soil conditioner has the function of nematode resistance, is rich in various amino acids and a small amount of calcium peroxide, and can increase the soil fertility and improve the soil permeability on the one hand.

The invention provides a method for decoloring, deodorizing and utilizing marigold silage fermentation liquor, which is characterized by comprising the following steps: alkaline earth metal peroxides such as calcium peroxide, magnesium peroxide and the like are used as oxygen sources, and under the synergistic action of ferrous ions, acidic black stink fermentation waste liquid obtained by anaerobic fermentation of marigold flowers is converted into colorless to pale yellow clear liquid with tasteless to light fragrance at normal temperature.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

Example one

After the preliminary solid-liquid separation treatment of the squeezed wastewater, the liquid part continuously flows into a stirring container, is stirred and mixed with calcium peroxide and ferrous sulfate which are added into the container in advance or added into the container intermittently, and continuously flows out of a reaction system after being subjected to three-stage mixed oxidation for 2 hours. And the liquid flowing out of the system enters a neutralization tank, is mixed and then enters a plate-and-frame filter for filter pressing, and the obtained clear filtrate is the colorless, odorless or weak yellow and weak aromatic multipurpose soil conditioner which has the function of inhibiting nematodes and is rich in amino acid and calcium lactate.

Example two

After the preliminary solid-liquid separation treatment is carried out on the squeezed wastewater, the liquid part intermittently flows into a stirring container, and intermittently flows out of a reaction system after stirring, mixing and oxidizing reaction is carried out for 2 hours with magnesium peroxide and ferrous sulfate which are added into the container in advance or are added into the container intermittently. And (3) the liquid flowing out of the system enters a neutralization tank or a neutralization tank to be mixed and then enters a plate-and-frame filter to be filtered, and the obtained clear filtrate is the colorless, odorless or faint yellow and faint aromatic multipurpose soil conditioner which has the function of inhibiting nematodes and is rich in amino acid and calcium lactate.

Claims

1. A method for decoloring, deodorizing and utilizing marigold silage fermentation liquor is characterized by comprising the following steps: alkaline earth metal peroxide is used as an oxygen source, the alkaline earth metal peroxide reacts with acidic black stink fermentation waste liquid obtained by marigold anaerobic fermentation at normal temperature for 1-24 hours under the synergistic action of water-soluble inorganic salt containing ferrous ions, the obtained liquid is neutralized and filtered, and the filtrate is colorless to light yellow clear liquid with tasteless to light fragrant smell and can be directly utilized.

2. The clear liquid obtained by decolorizing, deodorizing and filtering according to claim 1, can be used directly as a soil fertility conditioner.

3. The clear liquid obtained by decolorizing, deodorizing and filtering according to claim 1, can be used directly as soil nematode inhibitor.