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Packing liner for anaerobic dry fermentation of organic waste as well as preparation method and application of packing liner

A technology of organic waste and dry fermentation, which is applied in the field of organic waste treatment and recycling, can solve the problems of increasing the difficulty of fermentation residue, low material use efficiency, and difficult separation of zero-valent iron, so as to improve methane production efficiency, low cost, The effect of preventing clogging

Inactive Publication Date: 2019-01-08
BEIJING GEOENVIRON ENG & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in the anaerobic dry fermentation of organic waste, the traditional method of using zero-valent iron is still mainly mixed dosing. Although this method can achieve the expected effect, from an engineering point of view, the mixed dosing needs to be added before feeding. The mixing equipment completely mixes the zero-valent iron with the fermentation substrate. On the one hand, it will cause serious wear and tear on the equipment; on the other hand, after the anaerobic fermentation is completed, the remaining zero-valent It improves the efficiency of material use and increases the difficulty of subsequent disposal of fermentation residues
[0005] All in all, although the research on the enhancement of anaerobic fermentation of organic matter by zero-valent iron is becoming more and more mature, the application in practical engineering is obviously lagging behind, and people are still looking for a simple and effective way to use zero-valent iron.

Method used

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  • Packing liner for anaerobic dry fermentation of organic waste as well as preparation method and application of packing liner
  • Packing liner for anaerobic dry fermentation of organic waste as well as preparation method and application of packing liner
  • Packing liner for anaerobic dry fermentation of organic waste as well as preparation method and application of packing liner

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] 1. Composition of organic waste

[0046]The domestic refuse used in the embodiment comes from the fresh refuse of a certain landfill in Beijing (see Table 1 for the specific composition). After manually removing inert substances such as stones, metals, plastics and porcelain, the remaining kitchen waste, paper, leaves and other parts that are not easy to sort are used as organic waste for the test. After the organic waste is crushed (<120mm) and uniformly mixed, it is ready for use.

[0047] Table 1: Basic composition of domestic waste (wet basis %)

[0048]

[0049] 2. The preparation of the test group packing liner in the present embodiment comprises the following steps:

[0050] (1) Raw material preparation: Grind the elemental iron powder to obtain 200 mesh zero-valent iron powder for later use; after natural air-drying and crushing of the obtained plant straw, pass through a 0.125mm sieve, and take the sieved part for later use; the obtained natural The zeoli...

Embodiment 2

[0058] 1. Composition of organic waste

[0059] The configuration is the same as in Embodiment 1.

[0060] 2. The preparation of the test group packing liner in the present embodiment comprises the following steps:

[0061] (1) Prepare raw materials: Grind the elemental iron powder to obtain 80 mesh zero-valent iron powder for later use; air-dry and crush the obtained plant stalks naturally, pass through a 0.613mm sieve, and take the sieved part for later use; the obtained natural zeolite Sieve after crushing to obtain 80-mesh zeolite powder for subsequent use.

[0062] (2) The zero-valent iron powder with a mass percentage of about 65.0%, the plant straw with a mass percentage of about 30.0%, and the natural zeolite powder with a mass percentage of 5.0% are fully mixed and set aside.

[0063] (3) the iron-based composite filler obtained in step (2) is evenly spread on the nonwoven geotextile (200g / m 2 ). On the above-mentioned iron-based composite filler, spread one deck ...

Embodiment 3

[0068] Compared with Example 1, only the laid packing pads were recovered and reused, and the preparation and test methods of the rest of the packing pads were consistent with those of Example 1. A total of 6 cycles of dry anaerobic fermentation tests of organic waste have been completed for each layer of filler pads to verify its long-term effect and reliability of repeated use.

[0069] The measured gas production effect of the test group is as follows: Figure 4 shown. Since the fifth use of the packing liner, the gas production efficiency has decreased, only about 90% of the first use; and the sixth use, the gas production is only about 82% of the first use. Therefore, according to the application of the packing pad of the present invention, it is recommended that each layer of packing pad be used for 3-5 fermentation cycles.

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Abstract

The invention discloses a packing liner for anaerobic dry fermentation of organic waste as well as a preparation method and an application of the packing liner. The packing liner is prepared by the step that nonwoven geotextiles wrap iron-based composite packing which is fixed with a needle-punching method, wherein the iron-based composite packing is prepared from 60%-65% by mass of zero-valent iron powder, 25%-30% by mass of crop stalks or bamboo powder and 5%-15% by mass of zeolite powder by mixed compounding. With the adoption of the packing liner, many defects of mixed addition of zero-valent iron in a traditional anaerobic dry fermentation process of the organic waste are overcome, the application is simple, the reliability is high, methane production efficiency of an anaerobic systemis effectively improved, and energy regeneration development of the organic waste is promoted.

Description

technical field [0001] The invention relates to the technical field of organic waste treatment and resource utilization, in particular to a filler pad for anaerobic dry fermentation of organic waste, a preparation method and application thereof. Background technique [0002] The classified collection of domestic waste is a necessary stage for the sustainable social development of our country. Anaerobic fermentation technology provides a feasible technical path for the "recycling" treatment of organic waste (including kitchen waste, fruit and vegetable waste) collected after classification. Among various anaerobic fermentation modes, anaerobic dry fermentation has gradually become a key field of research and practice at home and abroad due to its advantages such as high volumetric gas production rate, low biogas slurry production, low energy consumption, and stable operation. [0003] The content of perishable parts in my country's domestic waste is relatively high, which is...

Claims

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Application Information

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IPC IPC(8): C12P5/02
CPCC12P5/023Y02E50/30
Inventor 倪哲甄胜利齐长青刘勇陈雨杨庆斌陈君王洋杜港
Owner BEIJING GEOENVIRON ENG & TECH
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