CN-119038745-B - Sustained-release composite sulfur autotrophic denitrification filler, preparation method and application

Abstract

The invention belongs to the technical field of sewage treatment, and in particular relates to a slow-release composite sulfur autotrophic denitrification filler, a preparation method and application thereof, wherein the slow-release composite sulfur autotrophic denitrification filler comprises the following components in parts by weight, 4-6 parts of sulfur powder and 1-3 parts of ferrous sulfide, the invention improves denitrification effect, the pH value of the effluent is more neutral, the filler loss is reduced, and the cost is reduced.

Inventors

• XU HUI
• SONG WEIHU
• LUO HAN
• ZHANG SIWEI
• SHAN LIWEI

Assignees

• 湖南诚通天岳环保科技有限公司

Dates

Publication Date

20260512

Application Date

20240926

Claims (8)

1. 1. The slow release type composite sulfur autotrophic denitrification filler is characterized by comprising, by weight, 4-6 parts of sulfur powder, 1-3 parts of ferrous sulfide, 1-3 parts of pH buffering agent, 0.5-1.5 parts of bentonite, 0.5-1.5 parts of starch and 0.5-1.5 parts of adhesive; The pH buffering agent is composite calcium carbonate which comprises, by weight, 45-55% of light calcium carbonate, 35-45% of nano calcium carbonate and 5-15% of sodium chlorate; The adhesive is one or more of styrene and butyl acrylate.
2. 2. The slow-release composite sulfur autotrophic denitrification filler as claimed in claim 1, which comprises the following components in parts by weight, 4 parts of sulfur powder, 1 part of ferrous sulfide, 2 parts of pH buffering agent, 1 part of bentonite, 1 part of starch and 1 part of adhesive.
3. 3. The slow release type composite sulfur autotrophic denitrification filler according to claim 1 or 2, wherein the particle size of the sulfur powder is 150-200 meshes.
4. 4. The slow release type composite sulfur autotrophic denitrification filler according to claim 1 or 2, wherein the bentonite is one or more of sodium bentonite, calcium bentonite and magnesium bentonite.
5. 5. The slow release type composite sulfur autotrophic denitrification filler according to claim 1 or 2, wherein the starch is corn starch.
6. 6. The slow release type composite sulfur autotrophic denitrification filler according to claim 1 or 2, wherein the particle size of the slow release type composite sulfur autotrophic denitrification filler is 8-10mm, and the bulk density is 1.13-1.28 g/cm 3 .
7. 7. A method for preparing the slow-release type composite sulfur autotrophic denitrification filler according to any one of claims 1-6, wherein sulfur powder, ferrous sulfide, a pH buffer, bentonite and starch are mixed, granulation is carried out, an adhesive is sprayed in the granulation process, and after the granulation is completed, drying, cooling and screening are carried out, so that the slow-release type composite sulfur autotrophic denitrification filler is obtained.
8. 8. Use of a slow release type composite sulphur autotrophic denitrification filler as defined in any one of claims 1-6 for treating sewage.

Description

Sustained-release composite sulfur autotrophic denitrification filler, preparation method and application Technical Field The invention belongs to the technical field of sewage treatment, and particularly relates to a slow-release composite sulfur autotrophic denitrification filler, a preparation method and application. Background As the national environmental protection policy becomes stricter, the improvement of the municipal wastewater pollutant emission standard is imperative, and the requirement for the deep denitrification of tail water is also increasing. In order to achieve the best denitrification effect in the heterotrophic denitrification process in biological denitrification, a large amount of carbon sources are required to be consumed, the carbon sources capable of denitrification in the secondary effluent of a common municipal sewage plant are fewer, and a large amount of carbon sources are required to be added to meet the reaction conditions, so that the operation cost of the sewage plant is too high. The total nitrogen is treated by the sulfur autotrophic denitrification process, and the common sulfur autotrophic denitrification filler on the market has the problems of poor denitrification effect, serious filler loss, poor pH buffering effect of the system and high cost. The patent application publication No. CN115028261A discloses a sulfur autotrophic denitrification filler and a preparation method thereof, wherein the sulfur autotrophic denitrification filler comprises, by weight, 50-100 parts of sulfur powder, 1-10 parts of an alkaline reducing agent, 10-40 parts of a pH buffering agent, 10-50 parts of kaolin and 10-20 parts of a binder, and the alkaline reducing agent is sulfite or bisulfite. Disclosure of Invention The invention aims to solve the technical problem of providing a slow-release composite sulfur autotrophic denitrification filler, a preparation method and application thereof, which can improve the denitrification effect, ensure that the pH value of effluent is more neutral, reduce the filler loss and reduce the cost. The embodiment of the invention provides a slow-release composite sulfur autotrophic denitrification filler, which comprises, by weight, 4-6 parts of sulfur powder, 1-3 parts of ferrous sulfide, 1-3 parts of pH buffering agent, 0.5-1.5 parts of bentonite, 0.5-1.5 parts of starch and 0.5-1.5 parts of adhesive. Preferably, the adhesive comprises the following components in parts by weight, 4 parts of sulfur powder, 1 part of ferrous sulfide, 2 parts of pH buffering agent, 1 part of bentonite, 1 part of starch and 1 part of adhesive. Preferably, the granularity of the sulfur powder is 150-200 meshes. Preferably, the pH buffering agent is composite calcium carbonate, and the composite calcium carbonate comprises the following components in percentage by weight, 45-55% of light calcium carbonate, 35-45% of nano calcium carbonate and 5-15% of sodium chlorate (preferably 50% of light calcium carbonate, 40% of nano calcium carbonate and 10% of sodium chlorate). The compound calcium carbonate can effectively solve the problem that the pH of the system is obviously reduced in the sulfur autotrophic denitrification process. Preferably, the bentonite is one or more of sodium bentonite, calcium bentonite and magnesium bentonite. The bentonite can regulate and control the pH value of the system in the sulfur autotrophic denitrification process, and can improve the strength of the filler Preferably, the starch is corn starch. Preferably, the adhesive is one or more of styrene and butyl acrylate. Preferably, the particle size of the slow-release composite sulfur autotrophic denitrification filler is 8-10mm, and the bulk density is 1.13-1.28 g/cm 3. The embodiment of the invention provides a preparation method of a slow-release type composite sulfur autotrophic denitrification filler, which comprises the steps of mixing sulfur powder, ferrous sulfide, a pH buffering agent, bentonite and starch, granulating, spraying an adhesive in the granulating process, drying, cooling and screening after granulating, so as to obtain the slow-release type composite sulfur autotrophic denitrification filler. The preparation method comprises the steps of screening sulfur powder, ferrous sulfide, a pH buffering agent, bentonite and starch, mixing the screened raw materials in a stirrer according to a proportion, mixing for 20min, slowly adding the mixed raw materials into a disc granulator, mixing an adhesive and water according to a volume ratio of 1:2-4, uniformly spraying the mixed raw materials into the disc granulator, spraying an adhesive diluent while feeding for granulation, stopping spraying the adhesive diluent after granulation, continuously rolling the filler in the disc granulator for 5-10 min, heating and drying after rolling, drying at 70-95 ℃, and cooling and screening after drying to obtain the slow-release compound sulfur autotrophic denitrification filler. The embodiment of th