Method for preparing slow-release compound fertilizer by utilizing high-phosphorus byproducts in water treatment

By treating high-phosphorus wastewater through high-temperature sterilization, chemical oxidation, and microbial treatment, slow-release compound fertilizer is prepared, solving the problems of high-phosphorus wastewater treatment difficulty and limited phosphate rock reserves, and realizing efficient utilization and the development of ecological agriculture.

CN121673111APending Publication Date: 2026-03-17INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY +1
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Patent Information

Application Number
CN202512013237.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-29
Publication Date
2026-03-17

AI Technical Summary

Technical Problem

High-phosphorus wastewater generated during aquatic product processing is difficult and costly to treat. Limited phosphate rock reserves lead to risks in the supply of phosphate fertilizers in ecological agriculture. Existing technologies are not effective in utilizing high-phosphorus wastewater to prepare slow-release compound fertilizers.

Method used

Phosphorus-containing wastewater is treated by high-temperature sterilization, chemical oxidation, activated carbon adsorption, and magnesium chloride flocculation. After adding Alcaligenes faecalis for cultivation, a slow-release compound fertilizer is prepared by spraying with a binder and wall material solution. A stable coating is formed by carboxymethyl chitosan and aldehyde-modified alkali lignin to achieve the slow-release supply of phosphorus and nitrogen.

Benefits of technology

It achieves the full utilization of high-phosphorus wastewater, reduces environmental treatment costs, improves phosphate fertilizer utilization, promotes plant growth, reduces pesticide and fertilizer use, and enhances crop yield and ecological agriculture development.

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Abstract

The invention relates to the technical field of slow-release compound fertilizers, in particular to a method for preparing a slow-release compound fertilizer by using high-phosphorus byproducts in water treatment. The method comprises the following steps: sequentially carrying out high-temperature sterilization, chemical oxidation, activated carbon adsorption and magnesium chloride flocculation treatment on phosphorus-containing and nitrogen-containing wastewater in the aquaculture as a raw material, adding alcaligenes faecalis for culturing, synchronously adding an alkaline phosphorus removal agent, carrying out physical adsorption and microbial degradation, and carrying out centrifugal separation to collect high-phosphorus byproduct filter residues; the high-phosphorus by-product, a binder and monopotassium phosphate are mixed and granulated to obtain a core material; and spraying a mixed aqueous solution of carboxymethyl chitosan, EDTA, aldehyde modified alkali lignin and sodium stearate as a wall material onto the surface of the core material, and drying to prepare the slow-release compound fertilizer. The whole technological process is simple, full-quality utilization of the high-phosphorus wastewater is achieved, the wastewater treatment cost is reduced, the use amount of pesticide and chemical fertilizer in agricultural production is reduced, the yield of crops is remarkably increased, and the method has important significance on development of ecological agriculture.
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