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Device for preparing fertilizer by using excess sludge and agricultural and forestry waste

A technology for preparing agricultural and forestry wastes and fertilizers, which is applied in the field of solid waste resource utilization devices, can solve the problems of slow growth and reproduction of microorganisms, insufficient nutrients, limited humus, etc., and achieve shortened composting cycle, comprehensive nutrients, and low bacteria and virus content Effect

Inactive Publication Date: 2017-08-18
SHAANXI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as we all know, although the excess sludge contains a large amount of organic matter and nutrients needed for plant growth, the humus contained in the excess sludge is limited and the air permeability is poor. Direct use will easily cause soil compaction. In addition, the excess Sludge also contains a certain amount of heavy metal ions, and there will be a huge ecological risk if it is used directly; although agricultural and forestry wastes are rich in humus and have good air permeability after composting, they can effectively alleviate the phenomenon of soil compaction. However, direct use of agricultural and forestry wastes Bio-production fertilizers have the disadvantages of slow microbial growth and reproduction, long fermentation time, and insufficient nutrients

Method used

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  • Device for preparing fertilizer by using excess sludge and agricultural and forestry waste
  • Device for preparing fertilizer by using excess sludge and agricultural and forestry waste
  • Device for preparing fertilizer by using excess sludge and agricultural and forestry waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: Using the remaining workshop sludge of the urban sewage treatment plant in Hanzhong City and sawdust from a wood processing plant in Hanzhong City as raw materials, the moisture content of the remaining sludge was measured to be 85.32%, the pH value was 6.8, and the organic matter content was 72.52% (anhydrous sludge mass percentage), TN content is 10.28% (anhydrous sludge mass percentage), TP content is 0.54% (anhydrous sludge); the measured wood chip cellulose content is 68.18%, of which hemicellulose content is 7.46% . During the experiment, the organic fertilizer was prepared by adding the mass ratio of wood chips and residual sludge at 1:1. The experiment found that under the condition of air blast volume of 1.8L / (Kg·min), the aerobic fermentation time was 10 days, and the facultative fermentation time was 8d, the anaerobic fermentation time is 6d, the measured humus content of compost product is 63.44% (mass percentage of product dried at 105°C), TN con...

Embodiment 2

[0025] Example 2: Using the remaining workshop sludge of the urban sewage treatment plant in Hanzhong City and sawdust from a wood processing plant in Hanzhong City as raw materials, the moisture content of the remaining sludge was measured to be 87.55%, the pH value was 6.6, and the organic matter content was 75.10% (anhydrous sludge mass percentage), TN content is 11.32% (anhydrous sludge mass percentage), TP content is 0.69% (anhydrous sludge); the measured wood chip cellulose content is 71.53%, of which hemicellulose content is 8.56% . During the experiment, the organic fertilizer was prepared by adding the mass ratio of wood chips and residual sludge at 1:1. The experiment found that under the condition of air blast volume of 1.8L / (Kg·min), the aerobic fermentation time was 10 days, and the facultative fermentation time was 8d, the anaerobic fermentation time was 6d, and the measured humus content of compost products was 62.26% (mass percentage of products dried at 105°C)...

Embodiment 3

[0026] Example 3: Using the remaining workshop sludge of the urban sewage treatment plant in Hanzhong City and sawdust from a wood processing plant in Hanzhong City as raw materials, the moisture content of the remaining sludge was measured to be 87.55%, the pH value was 6.6, and the organic matter content was 75.10% (anhydrous sludge mass percentage), TN content is 11.32% (anhydrous sludge mass percentage), TP content is 0.69% (anhydrous sludge); the measured wood chip cellulose content is 71.53%, of which hemicellulose content is 8.56% . During the experiment, the organic fertilizer was prepared by adding the mass ratio of sawdust and residual sludge at 1:1. The experiment found that under the condition of air blast volume of 1.8L / (Kg min), the aerobic fermentation time was 8 days, and the facultative fermentation time was 8d, the anaerobic fermentation time is 8d, the measured humus content of the compost product is 68.25% (mass percentage of product dried at 105°C), TN con...

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Abstract

The invention discloses a device for preparing a fertilizer by using excess sludge and agricultural and forestry waste. The device comprises a mixing system, a fermentation composting system, a screening system, a granulation and drying system, an exhaust gas treatment system, and a wastewater backflow system. Compared with the prior art, by using water, aerobiotic microorganisms and anoxic microorganisms in the excess sludge and cellulose in the agricultural and forestry waste, the device achieves organic matter degradation, pathogenic bacterium killing and heavy metal passivation of the excess sludge and the agricultural and forestry waste through the aerobiotic fermentation, anoxic fermentation and anaerobic fermentation of the excess sludge and the agricultural and forestry waste; the obtained product is thorough in degradation, good in air permeability, high in humus content, comprehensive and rich in nutrient and low in bacterium and virus content, and can serve as a farmland fertilizer or a soil conditioner. The device is simple in structure, stable and reliable in operation, high in production efficiency, and free of odor gas and secondary pollution.

Description

technical field [0001] The invention relates to a solid waste resource utilization device, which belongs to the technical field of environmental protection, in particular to a device for preparing fertilizer by using surplus sludge and agricultural and forestry waste. Background technique [0002] Excess sludge is a by-product produced in the process of treating domestic sewage by activated sludge method. Its output is large, its moisture content is high, and resource utilization is difficult. Especially in recent years, the urbanization process has accelerated, and the per capita water consumption has increased. The substantial increase in the sewage treatment rate has led to a rapid increase in the output of excess sludge in urban sewage treatment plants. Excess sludge has become an important source of urban solid waste and an important part of the garbage siege. It is different from other solid waste Because the remaining sludge contains a large amount of organic matter, ...

Claims

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Application Information

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IPC IPC(8): C05G3/04C02F11/04C05G3/80
CPCC02F11/04C05F5/002C05G3/80Y02E50/30
Inventor 李琛葛红光宋凤敏刘智峰刘军海王彦民
Owner SHAANXI UNIV OF TECH
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