Method of achieving synchronization of municipal sludge desiccation and nutrient utilization

A technology of natural drying and urban sludge, applied in dewatering/drying/concentrating sludge treatment, solid waste removal, etc., can solve problems such as unfavorable transportation and storage, polluted farmland soil, restrictions, etc. , the effect of reducing release and low energy consumption

Inactive Publication Date: 2013-04-24
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, sludge contains about 80wt% moisture, which is not conducive to transportation and storage; meanwhile, sludge also contains some harmful components, such as copper, zinc, cadmium, lead, chromium, arsenic, mercury and other heavy metals, which can pollute farmland soil
In particular, my country implemented a new organic fertilizer standard (NY525-2011) in December 2011, which has stricter restrictions on heavy metals, which greatly restricts the use of sludge as organic fertilizer after composting.

Method used

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  • Method of achieving synchronization of municipal sludge desiccation and nutrient utilization
  • Method of achieving synchronization of municipal sludge desiccation and nutrient utilization
  • Method of achieving synchronization of municipal sludge desiccation and nutrient utilization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In the farmland of an ecological experiment base of an agricultural university, 3 different fertilization methods were set up to plant bananas: direct application of sludge, sludge net bags, direct application of chemical fertilizers, and a control without fertilization was set up at the same time to conduct field experiments; the specific test settings were:

[0020] A. Apply sludge directly: directly apply sludge to the soil;

[0021] B. Sludge mesh bag: (1) Cut the nylon with a hole diameter of 2mm into a square nylon sheet of 1 square meter;

[0022] (2) Wrap 12.5 kg of sludge with the nylon sheet of step (1), and tie it with a rope to obtain a sludge mesh bag;

[0023] (3) Put the sludge net bag in step (2) on the soil next to the banana, the water in the sludge volatilizes and dries up naturally, the nutrients in the sludge flow into the banana soil through natural precipitation and are absorbed, and the fine roots of the crops are also absorbed. Can enter the ne...

Embodiment 2

[0049] In the dry slope of an agricultural university farm, 4 different fertilization methods were set up to plant Taiwan green jujube: direct application of sludge, sludge net bag, direct application of chemical fertilizer, direct application of organic fertilizer, and a control without fertilization was set up to conduct field experiments. The specific test settings are:

[0050] A. Applying sludge directly: apply the sludge directly on the soil, 6 times a year (with an interval of about 2 months), each time 2kg / plant (fresh sludge with a water content of 80%);

[0051] B. Sludge mesh bag: (1) Cut the plastic porous mesh with a pore size of 1mm into 0.5×0.5m 2 square plastic porous mesh;

[0052](2) Wrap 2 kg of fresh sludge with the plastic porous mesh of step (1), and tie it with a rope to obtain a sludge mesh bag;

[0053] (3) Put the sludge net bag in step (2) on the soil next to the jujube, 6 times a year (with an interval of about 2 months), the sludge moisture will ...

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Abstract

The invention discloses a method of achieving synchronization of municipal sludge desiccation and nutrient utilization. The method can utilize characteristics that heavy metal is low in activity (water-solubility and transfer ability) and N, P and K nutrients are high in activity. Sludge mesh bags can be placed on soils beside crops. The sludge can be desiccated as moisture in the sludge volatilizes naturally. Sludge nutrient can inflow into the soils of the crops by nature precipitation leaching so as to be absorbed. Radicula of the crops can root into the sludge mesh bags to absorb the nutrient and the moisture. Meanwhile, the crops can absorb the moisture and can further help to desiccate the sludge. The crops can be harvested and the desiccated sludge can be recollected at the same time. Defects of existing sludge desiccation and agricultural technology can be overcome. The method of achieving the synchronization of the municipal sludge desiccation and the nutrient utilization has the advantages of being low in energy consumption, capable of reducing the sludge heavy metal release obviously, capable of achieving environmental protection goal, simple and easy to operate, and easy to popularize. The desiccated sludge is beneficial for sludge subsequent processing.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment and utilization, in particular to a method for synchronously realizing natural drying of urban sludge and nutrient utilization. Background technique [0002] With the development of my country's urban economy and the increase of population, sewage plants discharge about 5.5 to 6 million tons of dry sludge every year, and show a significant growth trend. Improper treatment and disposal can lead to serious environmental pollution. With the popularization of sewage treatment facilities, the improvement of treatment capacity and the deepening of treatment degree, the generation of sludge has been increased. How to properly dispose of urban sludge has become a very urgent task. The composition of municipal sludge is relatively complex. It is rich in N, P and organic matter (better than pig and cow manure). It is a good source of organic fertilizer. Rational use of sludge in agriculture ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/12B09B3/00
Inventor 吴启堂谢方文卫泽斌林晓燕
Owner SOUTH CHINA AGRI UNIV
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