Synthesis of sustained-release fertilizer by resource utilization of phosphorus wastewater

Abstract

The invention discloses synthesis of a sustained-release fertilizer by resource utilization of phosphorus wastewater. The synthesis is characterized by comprising the following steps: by taking the content of phosphorus in phosphorus-containing wastewater as a measuring standard, feeding hydrated calcium chloroaluminate according to a mole ratio, stirring to react at normal temperature while controlling the reaction time to be 8-96 hours, passing through a column at normal temperature while controlling the retaining time to be 4-24 hours, separating precipitate, directly draining off the precipitate, discharging, and drying while setting the drying time to be 4-12 hours and the drying temperature to be 80-500 DEG C, thereby preparing the sustained-release fertilizer, namely, a calcium superphosphate sustained-release agent. According to the synthesis, hydrated calcium chloroaluminate is adopted to treat the phosphorus-containing wastewater to prepare the novel high-efficiency sustained-release fertilizer, namely, the calcium superphosphate sustained-release agent, a good environment-friendly effect is achieved, the wastewater is reused, the treated phosphorus-containing wastewater can be discharged without pollution, the content of phosphorus in supernatant of the treated wastewater is about 2.0mg / L, and the removal rate can be greater than 99%.

Description

technical field [0001] The invention relates to a slow-release chemical fertilizer synthesized by utilizing phosphorus-containing waste water as a resource, and belongs to the fields of environmental protection, reclaimed water reuse, chemical fertilizer industry, and functional nanometer technology. Background technique [0002] Pesticides have made an important contribution to improving crop yields, but a large amount of high-concentration wastewater will be produced during the production of pesticides, among which phosphorus-containing pesticide wastewater will be directly discharged into water bodies without treatment, which will lead to eutrophication of water bodies and cause water pollution. , water pollution has become a global environmental problem. Therefore, the treatment of phosphorus-containing pesticide wastewater should be strengthened. [0003] There is no mature treatment process in China that can effectively treat high-concentration phosphorus-containing p...

AI Technical Summary

Problems solved by technology

However, there are many types of phosphorus removal agents used in chemical methods, and the treatment effects are also quite different.

[0004] At present, there are a lot of domestic research on the properties and effects of phosphorus removal agents and the development and utilization of new agents, but there are few studies on the effective treatment of high-concentration phosphorus-containing pesticide wastewater, and the treatment effect is average.