Deodorization method for filter mud of sugar refinery

Abstract

The invention provides a deodorization method for filter mud of a sugar refinery, and belongs to the technical field of deodorization of filter mud. The method comprises the following steps: mixing a lactic acid bacteria compound bacteria liquid with filter mud; the lactic acid bacteria compound bacteria comprise lactobacillus plantarum, saccharomyces cerevisiae and bacillus subtilis. The lactobacillus compound bacteria liquid is used for treating the filter mud of the sugar refinery, the problem that the filter mud is smelly when placed is solved, environmental pollution is reduced, and meanwhile the loss speed of organic matter in the filter mud can be reduced. Industrial and agricultural wastes are used as main raw materials, resource utilization is achieved, nutrients are returned to the field, and cyclic utilization of the nutrients is achieved.

Description

Technical Field

[0001] This invention belongs to the field of filter mud deodorization technology, and particularly relates to a method for deodorizing filter mud in sugar factories. Background Technology

[0002] The main sources of sugar in China are sugarcane and sugar beets, with sugarcane sugar production being the primary source. However, filter mud is generated during the sugar-making process. Sugar mills operate from November to April of the following year, resulting in a concentrated accumulation of filter mud. If this filter mud cannot be quickly processed, it will lead to severe byproduct buildup, potentially causing resource waste and environmental pollution. Currently, the most common method for treating filter mud is agricultural resource recovery. Filter mud is high in organic matter and nutrients, making it suitable for direct return to the field or processing into organic fertilizer. However, processing filter mud into organic fertilizer requires a digestion process. Most sugar mills use the sulfite process during sugar production, resulting in filter mud containing high levels of sulfur. Unprocessed filter mud, during its storage, produces hydrogen sulfide, carbon disulfide, and other sulfur-containing odors due to the proliferation of various anaerobic microorganisms, severely polluting the environment. Furthermore, the rapid depletion of organic matter in the filter mud under the action of various microorganisms restricts the large-scale production of filter mud-containing organic fertilizer. Because filter mud organic fertilizer is relatively inexpensive and doesn't require much investment, most manufacturers don't treat the odor of the filter mud. At most, they only spray deodorizing agents on the surface of the smelly filter mud. This method can only suppress the odor from the surface. Once the filter mud is transferred or used, the odor will reappear, which is only a temporary solution.

[0003] Existing patents provide methods for deodorizing filter mud (CN 106565067 A), but these methods require reducing the moisture content of the filter mud through sun-drying and then adding various microorganisms that can decompose organic matter. While this method effectively deodorizes the filter mud, outdoor sun-drying of filter mud is greatly affected by weather and requires a large space, which is difficult for most manufacturers to implement. The patented method incorporates various organic matter-decomposing bacteria to accelerate the decomposition of organic matter in the filter mud raw material. However, if the filter mud is not consumed in time, the organic matter content of the commercial organic fertilizer produced from it may not meet the standards, requiring additional input of more relatively expensive high-organic-matter raw materials, increasing production costs. To overcome the shortcomings of existing technologies, this invention provides a convenient, low-cost, and effective method for deodorizing filter mud by reducing organic matter loss. Summary of the Invention

[0004] Therefore, the purpose of this invention is to provide a method for preventing odor in sugar factory filter mud.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solution: This invention provides a method for preventing odor from filter mud in sugar factories, comprising the following steps: The lactic acid bacteria compound bacterial solution is mixed with the filter mud; The lactic acid bacteria complex includes Lactobacillus plantarum, Saccharomyces cerevisiae, and Bacillus subtilis.

[0006] Preferably, the colony count of the Bacillus subtilis is ≥1.00 × 10⁻⁶. 8 CFU / g, wherein the colony count of *Lactobacillus plantarum* is ≥1.00 × 10⁻⁶. 7 The CFU / g of the brewing yeast is ≥1.00×10⁻⁶. 7 CFU / g.

[0007] Preferably, the lactic acid bacteria complex also includes corn flour.

[0008] Preferably, the preparation method of the lactic acid bacteria complex bacterial solution includes the following steps: Dissolve brown sugar in water, add lactic acid bacteria complex, seal and culture to obtain lactic acid bacteria complex liquid.

[0009] Preferably, the mass ratio of brown sugar, water and lactic acid bacteria complex is 1:(95~105):(0.1~0.2).

[0010] Preferably, the sealed culture is carried out at 25~30℃ for 1~2 days.

[0011] Preferably, the mass ratio of the lactic acid bacteria compound bacterial solution to the filter mud is 390~410:1.

[0012] Preferably, after mixing, the mixture is left to stand for 90 to 120 days.

[0013] Preferably, the filter mud is sugarcane filter mud.

[0014] Preferably, the method effectively reduces the loss of organic matter in the filter mud.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a method for preventing odor from sugar factory filter mud. It utilizes a lactic acid bacteria compound solution to treat the filter mud, reducing odor problems during storage, minimizing environmental pollution, and slowing down the loss of organic matter in the filter mud. This invention uses industrial and agricultural waste as the main raw material, achieving resource utilization, nutrient return to the field, and nutrient recycling. Attached Figure Description

[0016] Figure 1 The sugarcane filter mud treated in Example 1 retained its original yellow-green color after being left for 90 days. Figure 2 The image shows untreated sugarcane filter mud turning black after being left for 90 days. Figure 3 The relative distribution of the top 20 bacterial species in sugarcane filter mud from different treatment groups. Detailed Implementation

[0017] This invention provides a method for preventing odor from filter mud in sugar factories, comprising the following steps: The lactic acid bacteria compound bacterial solution is mixed with the filter mud; The lactic acid bacteria complex includes Lactobacillus plantarum, Saccharomyces cerevisiae, and Bacillus subtilis.

[0018] In this invention, the colony count of Bacillus subtilis is ≥1.00 × 10⁻⁶. 8 CFU / g, wherein the colony count of *Lactobacillus plantarum* is ≥1.00 × 10⁻⁶. 7 The CFU / g of the brewing yeast is ≥1.00×10⁻⁶. 7 CFU / g. The lactic acid bacteria complex also includes corn flour. The lactic acid bacteria complex, also known as lactic acid bacteria raw powder, was purchased from Shandong Tianrunhe Bioengineering Co., Ltd. The raw material composition of the lactic acid bacteria raw powder is Lactobacillus plantarum, Saccharomyces cerevisiae, Bacillus subtilis and corn flour.

[0019] In this invention, as a preferred embodiment, the preparation method of the lactic acid bacteria complex bacterial solution includes the following steps: Dissolve brown sugar in water, add lactic acid bacteria complex, seal and culture to obtain lactic acid bacteria complex liquid.

[0020] In this invention, the preferred mass ratio of brown sugar, water, and lactic acid bacteria complex is 1:(95~105):(0.1~0.2), more preferably 1:(97~102):(0.11~0.2), such as 1:100:0.12 or 1:100:0.2. The sealed culture is preferably conducted at 25~30℃ for 1~2 days, more preferably at 26~28℃ for 1~1.5 days, and even more preferably at 28℃ for 1 day or 28℃ for 1.5 days. The preferred mass ratio of the lactic acid bacteria complex solution to the filter mud is 390~410:1, more preferably 395~405:1, and even more preferably 400:1. This invention does not have a specific limitation on the mixing method; any method known in the art can be used, as long as uniform mixing is achieved, such as by turning and tossing. The pH of the lactic acid bacteria complex solution of this invention is less than 4.0, such as pH 3.68 or 3.84.

[0021] In this invention, after mixing, the mixture is left to stand for 90-120 days. The preferred temperature for this standing period is 25-30°C, more preferably 26-29°C, and even more preferably 28°C. The filter mud is sugarcane filter mud. This sugarcane filter mud is a byproduct of sugar mill refining, with a moisture content of approximately 70%, and the sugar mill's discharge time is ≤14 days.

[0022] In this invention, the method effectively reduces the loss of organic matter in the filter mud. That is, the deodorization method for sugar mill filter mud of this invention is an effective deodorization method for sugar mill filter mud that reduces the loss of organic matter in the filter mud.

[0023] In this invention, the lactic acid bacteria complex is also known as lactic acid bacteria raw powder.

[0024] In this invention, unless otherwise specified, all raw material components are commercially available products well known to those skilled in the art.

[0025] The technical solutions provided by the present invention will be described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0026] In the following examples, the lactic acid bacteria raw powder was purchased from Shandong Tianrunhe Bioengineering Co., Ltd., production license number: Lu Sitian (2021) H01919, implementation standard: Q / 370126TRH 025-2020, and is a mixed feed additive consisting of Bacillus subtilis + Lactobacillus plantarum + Saccharomyces cerevisiae, wherein Bacillus subtilis ≥1.00×10 8 CFU / g, Lactobacillus plantarum ≥1.00×10 7 CFU / g, brewer's yeast ≥1.00×10 7 CFU / g, moisture ≤10%, raw material composition is Lactobacillus plantarum, Saccharomyces cerevisiae, Bacillus subtilis and corn flour.

[0027] The sugarcane filter mud comes from COFCO Chongzuo Sugar Industry Co., Ltd., and a sub-contract for the treatment of sugarcane filter mud in the raw sugar workshop of COFCO Chongzuo Sugar Industry Co., Ltd. for the 2024-25 crushing season has been signed. The contract number of Party A (COFCO Chongzuo Sugar Industry Co., Ltd.) is CSCZ-YT-WT-2024-11-001.

[0028] Example 1 A method for preventing odor from filter mud in a sugar factory, the steps of which are as follows: (1) Dissolve 5 kg of food-grade brown sugar in 500 kg of water, add 600 g of lactic acid bacteria powder and mix well. Then, seal and culture at 28°C for 1.5 days to obtain the culture solution. The pH of the culture solution is 3.68.

[0029] (2) 200 tons of sugarcane filter mud was laid into strips by a loader. 500 kg of culture liquid was sprayed evenly onto the surface of the sugarcane filter mud. Then, the sugarcane filter mud was turned and mixed by an organic fertilizer turning machine. The turning was done once. The sugarcane filter mud was piled up and placed at 28℃ for 90 days.

[0030] Example 2 A method for preventing odor from filter mud in a sugar factory, the steps of which are as follows: (1) Dissolve 1 kg of food-grade brown sugar in 100 kg of water, add 200 g of lactic acid bacteria raw material, mix well, and incubate in a sealed container at 28°C for 1 day to obtain the expanded culture solution. The pH of the expanded culture solution is 3.84.

[0031] (2) Use a loader to spread 40 tons of sugarcane filter mud into a pile. During the mixing process, spray 100 kg of culture liquid evenly onto the surface of the sugarcane filter mud. After mixing, pile it up and place it at 28℃ for 90 days.

[0032] Example 3 The difference between this embodiment and embodiment 1 is that the placement time in step (2) of this embodiment is 120 days, while the other steps are the same as in embodiment 1.

[0033] Example 4 The difference between this embodiment and embodiment 2 is that the placement time in step (2) of this embodiment is 120 days, while the other steps are the same as in embodiment 2.

[0034] Experimental Example 1 After placing the sugarcane filter mud treated by the odor-proofing method of Example 1 (the filter mud group treated in Example 1) and the untreated filter mud (the filter mud group untreated) for 90 days, the interior of the filter mud of the different treatment groups was dug up, and the changes in color and odor were confirmed by sensory evaluation. The changes in odor of fresh sugarcane filter mud were also confirmed by sensory evaluation.

[0035] Table 1. Results of odor changes in sugarcane filter mud under different treatments

[0036] Figures 1-2 The results in Table 1 show that, in the comparative experiment, the sugarcane filter mud treated by the present invention retained its original yellow-green color and had a sour and slightly alcoholic odor; the untreated filter mud turned black and developed a foul odor, proving that the odor-preventing method of the present invention can effectively prevent the filter mud from oxidizing and developing a foul odor.

[0037] Experimental Example 2 After the sugarcane filter mud from Example 1 (the treated filter mud group of Example 1) and the untreated filter mud were placed for 90 days (the untreated filter mud group), filter mud samples from the treated filter mud group and the untreated filter mud group of Example 1 were sent to external testing sites for detection of the relative content distribution of microbial species.

[0038] Figure 3The results showed that, in the comparative experiment, the bacteria in the filter mud treated by the odor-preventing method of this invention were mainly Lactobacillus, accounting for 66.84% of the total bacteria. In the untreated filter mud group, the bacteria were mainly Rhabdanaerobium and Megasphaera, accounting for 13.59% and 15.81% respectively. This comparison indicates that Lactobacillus caused the growth of other microorganisms to stagnate, inhibit the synthesis of metabolites, and even kill them. The test results demonstrate that the odor-preventing method of this invention can effectively inhibit the growth of other microorganisms and suppress the production of sulfur-containing odor metabolites.

[0039] Experimental Example 3 Fresh sugarcane filter mud, sugarcane filter mud treated by the odor-proofing method of Example 3 (treated filter mud group of Example 3), and untreated filter mud were placed for 120 days (untreated filter mud group). The pH and organic matter (dry basis) of the filter mud with different treatments were tracked. The detection method was carried out according to NY / T 525. Each group was tested 6 times. The values ​​in Table 2 are average values.

[0040] Table 2. Changes in the physicochemical properties of filter mud in different treatment groups

[0041] The results in Table 2 show that, in the comparative experiment, the pH of the filter mud treated by the odor prevention method of the present invention is strongly acidic, while the pH of the filter mud in the untreated group is neutral. The pH of the filter mud treated by the odor prevention method of the present invention is lower than that of the untreated group, and the organic matter content of the filter mud treated by the odor prevention method of the present invention is higher than that of the untreated group. This indicates that the odor prevention method of the present invention can effectively slow down the rate of organic matter loss in sugarcane filter mud.

[0042] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for preventing odor from filter mud in a sugar factory, characterized in that, Includes the following steps: The lactic acid bacteria compound bacterial solution is mixed with the filter mud; The lactic acid bacteria complex includes Lactobacillus plantarum, Saccharomyces cerevisiae, and Bacillus subtilis.

2. The odor-prevention method according to claim 1, characterized in that, The colony count of the Bacillus subtilis was ≥1.00 × 10⁻⁶. 8 CFU / g, wherein the colony count of *Lactobacillus plantarum* is ≥1.00 × 10⁻⁶. 7 The CFU / g of the brewing yeast is ≥1.00×10⁻⁶. 7 CFU / g.

3. The odor-prevention method according to claim 1, characterized in that, The lactic acid bacteria complex also includes corn flour.

4. The odor-prevention method according to claim 1, characterized in that, The preparation method of the lactic acid bacteria compound bacterial solution includes the following steps: Dissolve brown sugar in water, add lactic acid bacteria complex, seal and culture to obtain lactic acid bacteria complex liquid.

5. The odor-prevention method according to claim 4, characterized in that, The mass ratio of brown sugar, water and lactic acid bacteria complex is 1:(95~105):(0.1~0.2).

6. The odor-prevention method according to claim 4, characterized in that, The sealed culture is carried out at 25~30℃ for 1~2 days.

7. The odor-prevention method according to claim 1, characterized in that, The mass ratio of the lactic acid bacteria compound bacterial solution to the filter mud is 390~410:

1.

8. The odor-prevention method according to claim 1, characterized in that, After mixing, let stand for 90-120 days.

9. The odor-prevention method according to claim 1, characterized in that, The filter mud is sugarcane filter mud.

10. The odor-prevention method according to claim 1, characterized in that, The method effectively slows down the loss of organic matter in the filter mud.

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