Method for preparing soil organic fertilizer by mixing salty mud and sludge

Abstract

The invention provides a method f or preparing soil organic fertilizer by mixing salty mud and sludge. The method comprises the following steps: (1) pretreating sludge with an organic fertilizer mixing mill, and adding a proper amount of salty mud and plant fiber waste in the mixing process; (2) performing stacking, oxygen enriching and fermenting on the sludge which is subjected to mixing pretreatment; (3) feeding the sludge which is subjected to oxygen enriching and fermenting treatment into an industrial joint production process, including microwave drying, ultraviolet sterilizing, mechanical grinding, mixing and stirring and granulating; and (4) quantitatively packaging the sludge treated in the step (3) to obtain the product. By adopting the method, salty mud combined with alkalinity regulating performance and adhesion performance is adopted, so that the cost is low, the activity of certain heavy metal elements possibly existing in the sludge can be passivated, the heavy metal elements cannot be absorbed by crops, and thus the pollution problem of agriculture can be solved. Furthermore, the product adopted as a base material is mixed with a small amount of inorganic nitrogen, phosphorus and potassium nutrients to produce the soil organic compound fertilizer to greatly promote pollution-free food development in China.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and specifically refers to a method for preparing soil organic fertilizer by mixing salt mud and sludge. Background technique [0002] Salt sludge is an industrial solid waste. In the chlor-alkali industry, salt is used as the main raw material to prepare chlorine, hydrogen and the slurry discharged from the process of caustic soda by electrolysis. The main components are magnesium hydroxide, calcium carbonate, barium sulfate and silt. The salt mud produced by the mercury method contains mercury compounds, and the discharge of mercury-containing salt mud into the environment will pollute the soil and water, and its disposal is a major social problem. [0003] The treatment of urban sludge is a major global topic, and developed countries have researched and applied it for decades. my country started late, but with the development of industrial production and the improvement of ...

AI Technical Summary

Problems solved by technology

Because landfill needs to occupy a large amount of land, it is easy to cause secondary pollution, and the transportation and site construction costs are high, so there are many disadvantages

Although incineration can achieve reduction treatment, the secondary pollution is serious, and there are also problems of high investment and operating costs

Although throwing into the sea is the simplest and cheapest, it is very damaging to the ecological environment, and countries have banned it. The Chinese government promised in early 1994 not to dispose of industrial waste, sewage and sludge at sea