Method for preparing organic fertilizer by mixed fermentation of water hyacinth and dewatered sludge

Abstract

The invention discloses a method for preparing an organic fertilizer by the mixed fermentation of hyacinth and dewatered sludge, which belongs to the environmental protection technical fields of innoxious processing and resource utilization of hyacinth and sludge. In the invention, the hyacinth is dewatered by squeezing and cracked, mixed with the dewatered sludge, microorganism microbial inoculum, heavy metal passivator, rice chaff or peanut shells for fermentation and aging, then matched with a certain quantity of humic acid and urea after the fermentation and aging to prepare a commodity organic fertilizer. The method not only solves the difficulty of subsequent innoxious processing of the hyacinth which absorbs the nitrogen and phosphor in the water for controling the eutrophication of a water body, and avoids the secondary pollution to the environment caused by the incorrect processing method of the hyacinth and sludge, but also produces the commodity organic fertilizer which meets the quality standard NY525-2002, thus obtaining a certain economic benefit and being more beneficial to the development of Chinese organic agriculture and the rehabilitation of environment, being capable of realizing the transferring of nitrogen and phosphor from the water body and urban sewage to farming lands and the recycling of nitrogen and phosphor, promoting the control on the water body and achieving several purposes with one measure.

Description

technical field [0001] The invention discloses a method for preparing organic fertilizer by mixed fermentation of water hyacinth and dewatered sludge, which belongs to the environmental protection technical field of harmless disposal and resource utilization of water hyacinth and sludge. Background technique [0002] In the past, after the water hyacinth was salvaged ashore, three methods of returning to the field were mainly adopted: covering, pit burying and natural stacking and retting. The mulching method is to directly cover the salvaged water hyacinth in the forest. The pit burial method is exactly to dig trenches around the trees in the woodland, and directly bury the collected water hyacinths or spread them in the woodland to air-dry and then bury them. The natural stacking retting method is to use the depressions in the forest to stack retting water hyacinth first, and stack them in a decentralized manner. [0003] As far as the current national situation is conce...

AI Technical Summary

Problems solved by technology

[0004] In the past, the methods of covering, burying, and natural stacking retting of water hyacinth were simple, which caused secondary pollution to the environment. The rotted liquid of water hyacinth returned to the river and polluted the water body, making it difficult to use water hyacinth to absorb nitrogen in water. The effect of phosphorus on water eutrophication is reduced to zero

Sludge landfill treatment firstly takes up a lot of land resources; secondly, the nutrients contained in the sludge will cause a large number of diseases and bacteria to multiply and the sludge will become mildewed, polluting the environment

Sludge incineration only gives people a good impression in terms of vision and senses. Sludge is reduced by 80% to 85% after incineration. In fact, it only reduces water and organic matter, but it consumes a lot of energy and easily causes environmental pollution.

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