CN-121990680-A - Ecological slow-release carbon source and preparation method thereof

Abstract

The application relates to the technical field of sewage treatment, and particularly discloses an ecological slow-release carbon source and a preparation method thereof. The ecological slow-release carbon source comprises, by weight, 30-50 parts of beeswax, 20-40 parts of water-soluble polysaccharide, 5-15 parts of water-soluble polymer, 3-10 parts of biodegradable elastomer and 10-20 parts of porous mineral material. The application can improve the hydrophilicity and mechanical property of the slow-release carbon source taking beeswax as the slow-release matrix under the condition of maintaining the slow-release characteristic of the slow-release carbon source taking beeswax as the slow-release matrix.

Inventors

• TANG YANGZE
• FENG ZHIFEI
• ZHANG JING
• XING JIANLIANG
• HU YINGBIN
• GAO WENWEN
• XIE TIANPENG
• WANG YUXUAN
• YAO ZEHUA

Assignees

• 江苏环保产业股份有限公司

Dates

Publication Date

20260508

Application Date

20260310

Claims (10)

1. 1. The ecological slow-release carbon source is characterized by comprising, by weight, 30-50 parts of beeswax, 20-40 parts of water-soluble polysaccharide, 5-15 parts of water-soluble polymer, 3-10 parts of biodegradable elastomer and 10-20 parts of porous mineral material.
2. 2. The ecologically slow release carbon source of claim 1 wherein the biodegradable elastomer comprises at least one of polybutylene adipate terephthalate, polybutylene succinate, polycaprolactone, or a copolymer of polybutylene adipate terephthalate, polybutylene succinate, and polycaprolactone.
3. 3. The ecologically slow release carbon source of claim 1 wherein the porous mineral material comprises at least one of diatomaceous earth, bentonite, zeolite powder, or biochar.
4. 4. The ecologically slow release carbon source of claim 1 wherein the water-soluble polysaccharide comprises one or more of maltodextrin, soluble starch, beta-cyclodextrin.
5. 5. The ecologically slow release carbon source of claim 1 wherein the water soluble polymer comprises one or more of polyvinyl alcohol, polyethylene glycol, hydroxypropyl methylcellulose.
6. 6. The ecologically slow-release carbon source of claim 5 wherein the water-soluble polymer is polyethylene glycol having a molecular weight of 1000-6000.
7. 7. The ecologically slow release carbon source of claim 1 further comprising an auxiliary blowing agent.
8. 8. The ecologically slow release carbon source of claim 7 wherein the auxiliary blowing agent is ammonium bicarbonate or citric acid.
9. 9. An ecologically slow release carbon source as claimed in any one of claims 1 to 8 comprising the steps of: S1, heating beewax to 80-85 ℃, after complete melting, sequentially adding a biodegradable elastomer, a water-soluble polymer, water-soluble polysaccharide and a porous mineral material under the conditions of heat preservation and shearing stirring, and shearing and stirring uniformly to obtain a viscous slurry; S2, injecting the viscous slurry into a die at 50-60 ℃, and carrying out distributed curing on the die, wherein in the first step, the temperature is raised to 75-85 ℃, the temperature is kept for 10-30 minutes, in the second step, the temperature is lowered to 25-35 ℃ at the rate of 2-5 ℃ per minute, the temperature is kept for 2-4 hours, and the primary carbon source is obtained after curing and molding; And S3, demolding the initial carbon source, soaking in deionized water for 12-48 hours, and drying at 40-50 ℃ to constant weight to obtain the ecological slow-release carbon source.
10. 10. The ecologically slow-release carbon source of claim 9 wherein in step S1 the biodegradable elastomer is cut into particles having a particle size of 5mm or less in advance.

Description

Ecological slow-release carbon source and preparation method thereof Technical Field The invention relates to the technical field of sewage treatment, in particular to an ecological slow-release carbon source and a preparation method thereof. Background In the biological denitrification process of low carbon nitrogen ratio (C/N) sewage or micro-polluted river and lake water, a carbon source is additionally added to drive the denitrification process. The solid slow-release carbon source is paid attention to because of the advantages of long-acting slow release, simple and convenient operation and management and the like. However, in the prior art, a single natural polymer such as an artificially synthesized polymer such as polycaprolactone or polyhydroxyalkanoate or starch is often used as a main material. The synthetic polymer has the problems of high cost, poor environmental persistence, low strength, easy disintegration, too fast or uncontrollable carbon release rate and the like. Beeswax is a widely available and renewable natural substance which can be used as a carbon source for microorganisms and is a potential good slow-release matrix. However, the direct development of beeswax as a slow-release carbon source faces three inherent technical bottlenecks, ①, the strong hydrophobicity of beeswax, the difficulty in incipient wetness caused by the strong hydrophobicity of beeswax, the failure of microorganisms to effectively utilize, and the "carbon source starvation" initiation period. ② The mechanical property is poor, the pure beeswax has large brittleness and low strength, and the formed product is fragile and difficult to keep the structural integrity under the actual hydrodynamic condition. ③ The release is difficult to regulate and control, and the release mainly depends on slow biodegradation or physical erosion of the release, so that the release rate is slow and is difficult to regulate and control according to the treatment requirement. Moreover, although attempts have been made in the prior art to blend beeswax with other materials, there are many cases where it is difficult to solve the above-mentioned contradictions of properties systematically and integrally by simple physical mixing, and this is often the case. Therefore, the characteristics of strong hydrophobicity, poor mechanical property, difficult release regulation and control and the like of the beeswax are required to be improved, and the ecological slow-release carbon source using the beeswax as a slow-release matrix is developed, so that the hydrophilicity and mechanical property of the ecological slow-release carbon source are improved on the premise of not obviously weakening the slow-release characteristic. Disclosure of Invention The application provides an ecological slow-release carbon source and a preparation method thereof, which aim to improve the hydrophilicity and mechanical properties of a slow-release carbon source taking beeswax as a slow-release matrix under the condition of maintaining the slow-release property of the slow-release carbon source taking beeswax as the slow-release matrix. In a first aspect, the application provides an ecological slow-release carbon source, which adopts the following technical scheme: The ecological slow-release carbon source comprises, by weight, 30-50 parts of beeswax, 20-40 parts of water-soluble polysaccharide, 5-15 parts of water-soluble polymer, 3-10 parts of biodegradable elastomer and 10-20 parts of porous mineral material. By adopting the technical scheme, beeswax is used as a slow-release skeleton and a structural main body of the whole slow-release carbon source. The biodegradable elastomer is interwoven in the beeswax, so that on one hand, the toughness of the whole slow-release carbon source can be enhanced, and the carbon source is prevented from being suddenly released due to cracking, and on the other hand, the degradation rate of the biodegradable elastomer is between the beeswax and the water-soluble component, so that the overall release rate of the carbon source can be regulated, and the problems of over-high initial release or insufficient later release are avoided. The water-soluble polysaccharide is uniformly dispersed in the hydrophobic beeswax to form hydrophilic micro-region. When the slow-release carbon source is put into water, the hydrophilic micro-areas absorb water and dissolve rapidly, so that an instant available starting carbon source can be provided for microorganisms, the problem of starting delay of the pure beeswax carbon source is solved, a large number of micropores can be reserved in situ in the originally compact beeswax matrix, and the contact area between water and internal beeswax is greatly increased. The water-soluble polymer is interpenetrating with beeswax and biodegradable elastomer network, and is partially combined with water-soluble polysaccharide, so that a more stable and continuous hydrophilic polymer network channel is formed on