A biodegradation method for treating metalworking fluid waste
By using a stepwise biodegradation method and specific bacterial agents to treat metalworking fluid waste, the problems of complex processes and high costs were solved, and efficient and environmentally friendly waste liquid treatment effects were achieved.
Patent Information
- Application Number
- CN202310551119.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-05-16
- Publication Date
- 2025-10-17
- Estimated Expiration
- 2043-05-16
AI Technical Summary
Existing metalworking fluid wastewater treatment technology processes are complex and costly, and traditional biological treatment methods require pretreatment, which increases treatment costs.
A stepped biodegradation method was adopted. First, bacterial agent A was inoculated and degraded for 14 days under normal temperature and aeration conditions. Then, bacterial agent B was inoculated and degraded for 14 days under normal temperature and aeration conditions. Biodegradation was carried out using bacterial agents such as Bacillus subtilis, Bacillus pumilus, and Pseudomonas aeruginosa, which were domesticated and screened in oil-containing environments.
It achieves efficient and harmless treatment of waste liquid, reduces process costs, avoids secondary pollution, completely degrades concentrated oil and solid precipitates, and simplifies the treatment process.
Smart Images
Figure BDA0004231513030000041
Abstract
Description
TECHNICAL FIELD
[0001] The present application belongs to the field of metal processing fluid, in particular to a biodegradation method for treating water-based metal processing fluid waste liquid. BACKGROUND
[0002] Metal processing fluid is widely used in the mechanical processing industry, has the functions of cooling, lubrication, cleaning and rust prevention, and has become an indispensable important supporting material. In the metal processing process, most of the metal processing fluid needs to be recycled in the machine tool. The machine tool is in an open working environment, so the processing fluid is easily infected by cutting debris dust, environmental microorganisms and the like, thereby affecting the stability and processing performance of the processing fluid. Long-term use will deteriorate and become invalid, becoming metal processing fluid waste liquid. Metal processing fluid waste liquid is one of the most difficult industrial waste liquids to treat in the mechanical processing industry at present, usually contains a large amount of mineral oil, animal and plant oil, surfactant, rust inhibitor, etc., and has high concentrations of chemical oxygen demand COD, total organic carbon and oil, which is difficult to treat. Physical, chemical and biological treatment methods have been formed. The membrane separation technology in the physical method has very high efficiency for oil-water separation and solid-liquid separation, and has small occupation area, but the serious membrane pollution problem limits the large-scale application of membrane filtration technology, and the concentrated oil produced will form solid waste; the coagulation method in the chemical method has low treatment cost, but a large amount of solid sediment will be produced, and the oxidation method can mineralize the pollutants into harmless inorganic matter, but the treatment cost is very high. The biological method has low treatment cost, and can convert the organic matter in the waste liquid into carbon dioxide, water and the like, realizing harmless and resource utilization of the waste liquid, and is the most promising waste liquid treatment method at present.
[0003] However, the existing metal processing fluid waste liquid biological treatment technology mostly needs to be pretreated such as oil removal and oxidation before biological treatment, and the treatment process is complex, which increases the treatment cost. The present application discards the traditional pretreatment superimposed biological treatment technology, and adopts a ladder biodegradation method to treat the metal processing fluid waste liquid, so as to realize effective purification of the pollutants in the waste liquid, which has very important significance for the development of related metal processing fluid. SUMMARY
[0004] Therefore, the present application provides a biodegradation method for treating water-based metal processing fluid waste liquid to solve the problems of complex treatment process and high treatment cost.
[0005] To achieve the above purpose, the technical scheme of the present application is as follows:
[0006] A biodegradation method for treating water-based metal processing fluid waste liquid, comprising the following steps: inoculating bacteria agents in the water-based metal processing fluid waste liquid in a ladder, and degrading the bacteria agents under certain conditions for a period of time after inoculation.
[0007] It comprises the following steps: inoculating a certain amount of bacteria A in the waste liquid, biodegrading under normal temperature and aeration for a period of time, inoculating a certain amount of bacteria B, and continuing to biodegrade under normal temperature and aeration for a period of time, forming a step-by-step biodegradation method.
[0008] The time for biodegradation of bacteria A under normal temperature and aeration is 14 days, and the time for biodegradation of bacteria B under normal temperature and aeration is 14 days.
[0009] The inoculation amount of the bacteria A and B in the waste liquid treatment process is 0.5-1.5% of the waste liquid, and the viable bacterial count of the bacteria A and B is at least 2.5 billion / mL.
[0010] The bacteria A comprises one or both of Bacillus subtilis and Bacillus pumilus.
[0011] Preferably, the bacteria A is a mixture of Bacillus subtilis and Bacillus pumilus, and the ratio of Bacillus subtilis to Bacillus pumilus in the bacteria A is 1:1, and both are obtained by long-term domestication and screening in an oil-containing environment.
[0012] The bacteria B comprises one or more than two of Pseudomonas aeruginosa, Pseudomonas putida and Pseudomonas putida.
[0013] Preferably, the bacteria B is a mixture of Pseudomonas aeruginosa, Pseudomonas putida and Pseudomonas putida, and the ratio of Pseudomonas aeruginosa to Pseudomonas putida to Pseudomonas putida in the bacteria B is 1:1:1, and all are obtained by long-term domestication and screening in an oil-containing environment.
[0014] Compared with the prior art, the biodegradation method for waste liquid treatment of water-based metal processing fluid has the following advantages:
[0015] Based on the microbial technology, the biodegradation of the metal processing fluid waste liquid is realized, the waste liquid is harmlessly treated, the secondary pollution in the whole waste liquid treatment process is avoided, and the green environmental protection of the waste liquid treatment process is realized. Compared with the existing waste liquid treatment technology, on the one hand, through complete biodegradation of pollutants, the problems of residual concentrated oil and solid precipitation in the physical and chemical method are solved, and on the other hand, the pretreatment method in the traditional biological treatment method is abandoned, and the process cost is reduced. DETAILED DESCRIPTION
[0016] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.
[0017] The present application will be described in detail below with reference to the embodiments.
[0018] The biodegradation method is as follows: inoculating a certain amount of bacteria A in the waste liquid, biodegrading under normal temperature and aeration condition for 14 days, inoculating a certain amount of bacteria B, and continuously biodegrading under normal temperature and aeration condition for 14 days to form a ladder biodegradation method.
[0019] The inoculation amount of the bacteria A and B in the waste liquid treatment process is 1%, and the viable bacterial count of the bacteria A and B is greater than 2.5 billion / mL.
[0020] The bacteria A includes Bacillus subtilis and Bacillus pumilus in equal proportions, and both are obtained by long-term domestication and screening in an oil-containing environment.
[0021] The bacteria B includes Pseudomonas aeruginosa, Pseudomonas nigrificans and Pseudomonas putida, in equal proportions, and all are obtained by long-term domestication and screening in an oil-containing environment.
[0022] Embodiment:
[0023] A metal processing liquid waste liquid is obtained on site in a machining enterprise in Tianjin, 1% of bacteria A is inoculated in the waste liquid, biodegraded under normal temperature and aeration condition for 14 days, 1% of bacteria B is inoculated, and continuously biodegraded under normal temperature and aeration condition for 14 days, and the degradation effect is shown in Table 1. The biodegradation method can realize more than 90% of the degradation rate of COD and oil substances in the waste liquid.
[0024] Table 1 Comparison of indexes before and after biodegradation of metal processing liquid waste liquid
[0025]
[0026] The above only describes the preferred embodiments of the present application and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A biodegradation method for treating water-based metalworking fluid waste, characterized by: The method comprises the following steps: inoculating a certain amount of bacterial agent A into the waste liquid, biodegrading the waste liquid under normal temperature and aeration conditions for a period of time, then inoculating a certain amount of bacterial agent B, and continuing to biodegrade the waste liquid under normal temperature and aeration conditions for a period of time, thereby forming a stepwise biodegradation method; Bacterial agent A is a mixture of Bacillus subtilis and Bacillus pumilus, with the ratio of Bacillus subtilis to Bacillus pumilus in Bacterial agent A being 1:1, and both Bacillus subtilis and Bacillus pumilus are obtained by long-term acclimation and screening in an oil-containing environment; Bacterial agent B is a mixture of Pseudomonas aeruginosa, Brevundifectomonas, and Pseudomonas putida. The ratio of Pseudomonas aeruginosa, Brevundifectomonas, and Pseudomonas putida to bacterial agent B is 1:1:1, and all of them are obtained by long-term domestication and screening in an oil-containing environment.
2. The biodegradation method for treating water-based metalworking fluid waste according to claim 1, characterized in that: Under normal temperature conditions, the aeration biodegradation time of bacterial agent A is 14 days, and the aeration biodegradation time of bacterial agent B is 14 days under normal temperature conditions.
3. The biodegradation method for treating water-based metalworking fluid waste according to claim 1, characterized in that: The inoculation amount of the bacterial agents A and B in the waste liquid treatment process is 0.5-1.5% of the waste liquid, and the number of viable bacteria of the bacterial agents A and B is at least 2.5 billion / mL.