CN-119263478-B - Semi-permanent filiform sulfur autotrophic filler for microplastic end treatment and preparation method and application thereof

CN119263478BCN 119263478 BCN119263478 BCN 119263478BCN-119263478-B

Abstract

The invention belongs to the technical field of environmental functional materials and sewage treatment, and particularly relates to a semi-permanent filiform sulfur autotrophic filler for microplastic terminal treatment, and a preparation method and application thereof. The invention provides a semi-permanent filiform sulfur autotrophic filler, which is prepared from sodium sulfide, humic acid, portland cement, slaked lime, pyrite, municipal sewage plant sludge, chitosan, aluminum powder and water. The semi-permanent filiform sulfur autotrophic filler has the characteristic of light weight, simultaneously maintains enough strength, and overcomes the problem of insufficient strength of the existing filler. In addition, the semi-permanent filiform sulfur autotrophic filler can also accelerate the domestication speed and the enrichment speed of sludge, promote the rapid growth of filiform sulfur autotrophic bacteria, further improve the interception capability of the filiform sulfur autotrophic bacteria on micro plastics, further improve the denitrification capability of the micro plastics, effectively remove a large amount of tiny micro plastics remained in municipal sewage plants, and has wide application prospect.

Inventors

ZHU SHIZHI
CHEN ZHIJUN
Deng Jingyong
LU ZHENG

Assignees

深圳市臻鼎环保科技有限公司

Dates

Publication Date: 20260512
Application Date: 20241011

Claims (6)

1. The application of the semi-permanent filiform sulfur autotrophic filler in the treatment of the end of the microplastic is characterized in that the semi-permanent filiform sulfur autotrophic filler is put into an anaerobic bioreactor, after the reactor forms a relatively uniform water distribution condition through internal reflux, anaerobic tank sludge of municipal sewage plants is added, and then in-situ domestication is carried out, and the treated microplastic can be used for treating after the domestication is completed; The preparation method of the semi-permanent filiform sulfur autotrophic filler comprises the following steps: S1, preparing aluminum powder into aluminum powder suspension by using water; s2, adding silicate cement, slaked lime and pyrite powder into water, stirring uniformly, adding aluminum powder suspension, continuously and fully stirring uniformly, pouring into a multi-ball die, and packaging to fix the shape; s3, placing the prepared mould into a constant temperature and humidity box, and standing for 3-6 hours to obtain a biological filler embryo with a fixed shape; s4, placing the blank into an autoclaved reaction kettle, and continuously standing to obtain a biological filler matrix; s5, preparing chitosan into uniform mucus, adding municipal sewage plant sludge and humic acid, fully and uniformly stirring, then adding slaked lime, and continuously and fully stirring to prepare biological filler interlayer mucus; s6, taking out the biological filler matrix of the S4, dismantling the matrix into spherical fillers with one particle according to the shaping of the die, and then uniformly smearing mucus in the middle layer of the biological filler of the S5 on the coarse spherical filler matrix; S7, when the mucus in the middle layer is not solidified and dehydrated, rapidly wrapping a layer of thin slaked lime powder on the spherical filler matrix coated with the mucus in the middle layer, soaking the lime powder by exudation of the mucus, finally standing for 1-3 hours, determining that the exudation of the mucus in the middle layer is soaking the lime powder, and drying to obtain a biological filler semi-finished product; s8, preparing sodium sulfide into 8-12% sodium sulfide solution, uniformly and slightly attaching the sodium sulfide solution in a biologic filler semi-finished product in a multiple atomization spraying mode, spraying once every 4 hours for 5 times, wherein the spraying period is 24 hours in total, modifying the surface filler by using the sodium sulfide solution, standing for 2-5 days, cleaning surface impurities by using water, and finally drying to obtain the semi-permanent filiform sulfur autotrophic filler.
2. The use according to claim 1, wherein the molecular weight of humic acid is in the range of 1000-4000, the strength grade of Portland cement is 32.5R-52.5R, the size of pyrite and slaked lime is 200-400 mesh, and the water content of municipal sewage plant sludge is between 20% -50%.
3. The use according to claim 1, wherein in S1 the mass concentration of the aluminium powder suspension is 20% -50%.
4. The use according to claim 1, wherein in S3 the temperature of rest in a constant temperature and humidity cabinet is 40 ℃ to 60 ℃, the humidity is 95% or more, and the time is 3 to 6 hours.
5. The use according to claim 1, wherein in S4 the temperature of the autoclave is 180 ℃ to 190 ℃ for 6 to 8 hours.
6. The use according to claim 1, wherein S6 the thickness of the bio-filler intermediate mucus applied to the spherical filler matrix is 2-4mm and S7 the process of making the slaked lime powder coating is repeated 2-5 times until the lime powder coating has a thickness of 2-4mm.

Description

Semi-permanent filiform sulfur autotrophic filler for microplastic end treatment and preparation method and application thereof Technical Field The invention belongs to the technical field of environmental functional materials and sewage treatment, and particularly relates to a semi-permanent filiform sulfur autotrophic filler for microplastic terminal treatment, and a preparation method and application thereof. Background Microplastic (MPs) generally refers to plastics with equivalent diameters of less than 5mm, and is widely available and of great variety. In general, for larger microplastic particles, most of the sewage tends to settle with the sludge, thereby disengaging from the water circulation. Whereas for smaller microplastic particles, such as fine microplastic particles (or filiform plastics) smaller than 50 microns, it is difficult to remove from the water. At present, microplastic exists in the human body and various water bodies, and enters various loops related to biospheres. For example, microplastic build-up and circulation in the food chain occurs as the animal feeds and water. Meanwhile, the microplastic can also circulate continuously in the blood system of the human body, and further accumulate in a certain tissue or tiny blood vessel. In general, microplastic does not directly cause chemical injury to human body, usually caused by a large accumulation of animal tissue or blood vessel blockage, with dire consequences, but microplastic capable of entering blood system is often tiny microplastic which is difficult to be seen with naked eyes. The reason why microplastic enters into water is that many people can grasp the safety of sewage plants and running water plants, compared with the large natural water. For water circulation, most of the microplastic produced in the production and life of people has a circulation starting point of water pollution, wherein besides direct pollution of water garbage, part of the microplastic in soil is degraded and then is collected into water along with groundwater or rain wash, so that the microplastic enters the water circulation. Thus, for efficient control of microplastic in water, a more suitable control method may be found in sewage plants and waterworks. The sulfur autotrophic denitrification is an autotrophic denitrification process technology, has the advantage of no need of adding carbon source, and is mainly carried out by a method for preparing sulfur-containing filler in the current market, and has various characteristics. However, in general, the method still has the defects that the capability of screening special bacteria is lacking, special pollutants similar to micro plastics cannot be treated, the water permeability is low, the materials are easy to break and fall off after being utilized, the hydraulic distribution is uneven, the phenomenon of 'hydraulic short flow' is generated, the materials are re-added, microorganisms need to be re-mounted, and the like. Municipal wastewater has a large number of fine microplastic materials that are difficult to remove from the water and low chemical oxygen demand: total nitrogen (C/N), requiring the addition of a large amount of carbon source. Moreover, for municipal sewage plants, nitrogen and phosphorus removal are the main roles, and the removal of microplastic is only the side effect, so that most municipal sewage plants still discharge a large amount of microplastic into natural water every year. In addition, the existing microplastic treatment method mainly comprises a physical interception method and a physical chemical precipitation method, is high in cost, needs to independently build new structures, and occupies more land area. Thus, there is still a lack of process technology that can simultaneously remove both the microplastic and the total nitrogen. The sulfur autotrophic bacteria are of various types, under the condition of high concentration of sulfide in the same anaerobic system, sulfur circulation can be integrated in a small scale in one reactor, so that the microbial system in a single anaerobic sulfur reactor is very complex, the sludge acclimatized by sulfur is often of the genus thiobacillus with high abundance of microbial community, and the bacteria cannot quickly form better biological films and zoogloea and cannot deeply filter fine microplastic. The sulfur filamentous bacteria can form better and stable biological films and zoogloea, and a permeable filtering biological film layer is naturally formed, so that the aim of intercepting fine micro plastic particles is hopefully realized. Therefore, there is a need to develop a filiform sulfur autotrophic filler for microplastic end treatments. Disclosure of Invention In order to overcome the defects in the prior art, the invention provides a semi-permanent filiform sulfur autotrophic filler for treating the tail ends of Microplastic (MPs), which can effectively remove a large amount of tiny microplastic remained in munici