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CN-121972232-A - Method for preparing wastewater treatment agent by using fish culture solid waste

CN121972232ACN 121972232 ACN121972232 ACN 121972232ACN-121972232-A

Abstract

The invention discloses a method for preparing a wastewater treatment agent by utilizing fish culture solid waste, which comprises the following steps of (1) drying fish feces, carbonizing, washing the obtained solid product with water, drying and grinding to obtain biomass carbon powder. (2) Adding Mn 2+ source, fe 3+ source, urea and glucose into water to form a mixed solution, then carrying out hydrothermal reaction under the stirring condition, freeze-drying the obtained reaction solution after completion, and grinding to obtain the modified spinel type manganese ferrite powder. (3) And uniformly mixing the biomass carbon powder, the modified spinel type manganese ferrite powder, the polyethylene glycol, the Mn 2+ source and the Fe 3+ source, granulating by a wet method, drying, solidifying, standing in water, and airing to obtain the wastewater treatment agent. According to the invention, the fish culture solid waste is prepared into the biochar with rich pore structures, and then the biochar is combined with the catalyst to form the treating agent, so that the effective utilization of the waste is realized.

Inventors

  • NI SONGYUAN
  • ZHAN CHANGHONG
  • ZHANG GUANGSHAN
  • ZHENG QINGZHU
  • LI HANXIN
  • WEI KEMING
  • WU MENGDI
  • LI MENGHAN

Assignees

  • 青岛哈尔滨工业大学(威海)研究院

Dates

Publication Date
20260505
Application Date
20260209

Claims (10)

  1. 1. The method for preparing the wastewater treatment agent by using the fish culture solid waste is characterized by comprising the following steps of: (1) Drying fish feces, carbonizing, washing the obtained solid product with water, drying, and grinding to obtain biomass carbon powder; (2) Adding Mn 2+ source, fe 3+ source, urea and glucose into water to form a mixed solution, then carrying out hydrothermal reaction under the stirring condition, freeze-drying the obtained reaction solution after completion, and grinding to obtain modified spinel type manganese ferrite powder; (3) Calcining hydrotalcite powder to obtain modified hydrotalcite powder, adding the modified hydrotalcite powder, urea and glucose into water to form suspension, performing hydrothermal reaction, freeze-drying the obtained reaction solution after completion, and grinding to obtain carbon quantum dot intercalated hydrotalcite powder; (4) And uniformly mixing the biomass carbon powder, the modified spinel type manganese ferrite powder, the carbon quantum dot intercalated hydrotalcite powder, the polyethylene glycol, the Mn 2+ source and the Fe 3+ source, then carrying out wet granulation, drying, solidifying, standing in water, and then airing to obtain the wastewater treatment agent.
  2. 2. The method for preparing a wastewater treatment agent by using fish culture solid waste according to claim 1, wherein in the step (1), the carbonization treatment is performed at a temperature of 450-530 ℃ for 2-2.5 hours, and optionally, in the step (1), the fineness of the biomass carbon powder is 60-80 meshes.
  3. 3. The method for preparing a wastewater treatment agent by using fish culture solid waste according to claim 1, wherein in the step (2), the molar ratio of Mn 2+ 、Fe 3+ to urea is 1:2:12-15.
  4. 4. The method for preparing a wastewater treatment agent by using fish culture solid waste according to claim 1, wherein in the step (2), the Mn 2+ source comprises at least one of manganese chloride, manganese nitrate and manganese acetate; Optionally, in the step (2), the Fe 3+ source comprises at least one of ferric chloride, ferric nitrate and manganese sulfate.
  5. 5. The method for preparing a wastewater treatment agent by using fish culture solid waste according to claim 1, wherein in the step (2), the mass ratio of urea to glucose is 3-4:1.
  6. 6. The method for preparing a wastewater treatment agent by using fish culture solid waste according to claim 1, wherein in the step (2), the temperature of the hydrothermal reaction is 170-210 ℃ and the time is 10-14 hours; optionally, in the step (2), the fineness of the modified spinel type manganese ferrite powder is 200-300 meshes; Optionally, in the step (3), the calcination temperature is 390-420 ℃ and the time is 30-50 min.
  7. 7. The method for preparing a wastewater treatment agent by using fish culture solid waste according to claim 1, wherein in the step (3), the ratio of the modified hydrotalcite powder to urea to glucose is 1 g:0.3-0.35 g:0.15-0.18 g, and optionally the fineness of the modified hydrotalcite powder is 100-200 meshes.
  8. 8. The method for preparing a wastewater treatment agent by using fish culture solid waste according to claim 1, wherein in the step (3), the solid-liquid ratio of the suspension is 1:40-60 mL; optionally, in the step (3), the temperature of the hydrothermal reaction is 170-205 ℃ and the time is 6-8 hours; optionally, in the step (3), the fineness of the carbon quantum dot intercalated hydrotalcite powder is 200-300 meshes.
  9. 9. The method for preparing a wastewater treatment agent by using fish culture solid waste according to any one of claims 1 to 8, wherein in the step (4), the ratio of biomass carbon powder, modified spinel type manganese ferrite powder, carbon quantum dot intercalated hydrotalcite powder, polyethylene glycol, mn 2+ source and Fe 3+ source is 10-13.5 g:2.5-3.2 g:1-2 g:3-4.5 g:0.6-0.8 g:1.2-1.6 g.
  10. 10. The method for preparing a wastewater treatment agent by using fish culture solid waste according to any one of claims 1 to 8, wherein in the step (4), the standing time is 2 to 4 hours; optionally, in the step (4), the drying temperature is 55-75 ℃ and the drying time is 18-24 hours; Optionally, in the step (4), the particle size of the wastewater treatment agent is 2-5 mm.

Description

Method for preparing wastewater treatment agent by using fish culture solid waste Technical Field The invention relates to the technical field of wastewater treatment, in particular to a method for preparing a wastewater treatment agent by utilizing fish culture solid waste. Background The disclosure of this background section is only intended to increase the understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art already known to those of ordinary skill in the art. Fish farming, particularly industrial circulating water high-density farming, plays a key role in meeting the growing demands of aquatic products worldwide. However, its rapid expansion is accompanied by a series of environmental challenges, in which the generation and discharge of solid waste forms one of the important sources of pressure for water ecosystems. These solid wastes are directly related to the ecological health of the aquaculture water and the surrounding environment. For example, a significant proportion of feed is not effectively utilized due to improper feeding strategies (e.g., overfeeding), dissolution of feed particles in water, and differences in feeding behavior of fish populations. Second, fish feces are another core source, which contains significant amounts of unabsorbed organics, nitrogen, phosphorus, and partially undigested material. In intensive cultivation, the large total amount of feces produced by high-density fishes is also an important cause of high Chemical Oxygen Demand (COD) due to the fact that the organic matter content of cultivation water is high. The solid wastes are deposited in the water body, and a large amount of oxygen is consumed in the microbial decomposition process, so that the bottom water body is anoxic and even anaerobic, and substances such as ammonia nitrogen, phosphate, hydrogen sulfide and the like are released. The release of the nitrogen and phosphorus nutrient salts is a key for inducing eutrophication of the culture water body, and may further cause ecological problems such as algal bloom, expansion of low-oxygen areas and the like. Therefore, how to use these solid wastes produced in farms with high value and resources is an important issue. Disclosure of Invention The invention provides a method for preparing a wastewater treatment agent by utilizing fish culture solid waste, which can be used for treating the fish culture wastewater by preparing the solid waste into biochar with rich pore structures and then combining the biochar with a catalyst, thereby promoting the high-value and recycling utilization of the fish culture solid waste and realizing the closed loop of waste utilization and culture. Specifically, the technical scheme of the invention is as follows. A method for preparing a wastewater treatment agent by using fish culture solid waste comprises the following steps: (1) And (3) drying fish feces, carbonizing, washing the obtained solid product with water, drying and grinding to obtain biomass carbon powder. (2) Adding Mn 2+ source, fe 3+ source, urea and glucose into water to form a mixed solution, then carrying out hydrothermal reaction under the stirring condition, freeze-drying the obtained reaction solution after completion, and grinding to obtain the modified spinel type manganese ferrite powder. (3) Calcining hydrotalcite powder to obtain modified hydrotalcite powder, adding the modified hydrotalcite powder, urea and glucose into water to form suspension, performing hydrothermal reaction, freeze-drying the obtained reaction solution after completion, and grinding to obtain carbon quantum dot intercalated hydrotalcite powder. (4) And uniformly mixing the biomass carbon powder, the modified spinel type manganese ferrite powder, the carbon quantum dot intercalated hydrotalcite powder, the polyethylene glycol, the Mn 2+ source and the Fe 3+ source, then carrying out wet granulation, drying, solidifying, standing in water, and then airing to obtain the wastewater treatment agent. Further, in the step (1), the carbonization treatment is performed at a temperature of 450-530 ℃ for 2-2.5 hours. Further, in the step (1), the fineness of the biomass carbon powder is 60-80 meshes. Further, in the step (2), the molar ratio of Mn 2+、Fe3+ to urea is 1:2:12-15. Further, in the step (2), the Mn 2+ source comprises at least one of manganese chloride, manganese nitrate, manganese acetate and the like. Further, in the step (2), the Fe 3+ source comprises at least one of ferric chloride, ferric nitrate, manganese sulfate and the like. Further, in the step (2), the mass ratio of urea to glucose is 3-4:1. Further, in the step (2), the temperature of the hydrothermal reaction is 170-210 ℃ and the time is 10-14 hours. Further, in the step (2), the fineness of the modified spinel type manganese ferrite powder is 200-300 meshes. Further, in the step (3), the calcina