Application of portable infrared analysis system in anaerobic composting process

Posted on

Jiang Juan
(College of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074)
Abstract: In order to make better use of the gas produced by anaerobic treatment, this paper uses a portable infrared analysis system to study the gas production during the anaerobic composting process based on the introduction of simulated anaerobic composting experiments. The results showed that at the beginning of anaerobic composting, the methane yield was only about 7.8%, which was much lower than the carbon dioxide yield of 32.8%; as the reaction progressed, the methane yield was gradually higher than the carbon dioxide yield, and on the 90th day The highest value reached about 42.0% at around; thereafter, the yields of carbon dioxide and methane gradually decreased, but the methane yield was always higher than the carbon dioxide yield.
Keywords: domestic waste, portable infrared analysis system, anaerobic composting

1 Overview
There are three main methods of garbage disposal currently being promoted: sanitary landfill, composting, and incineration. With the development of the concept of circular economy in the process of municipal solid waste disposal, the composting method has a strong vitality as an important way to reduce, recycle, and harmless municipal solid waste. As aerobic composting process requires a large amount of oxygen, it needs to consume a lot of energy, and anaerobic digestion not only does not need to consume a lot of energy, but also can collect biogas as a clean energy. Therefore, from the perspective of circular economy, it is an ideal treatment method.
Gas production in the process of anaerobic composting is an important indicator. In order to make better use of the gas produced by anaerobic treatment, this study analyzed the gas production of anaerobic composting of domestic garbage using a portable infrared analysis system. In the research and analysis, it was found that in the anaerobic composting gas production of domestic garbage, the methane yield is not higher than the carbon dioxide yield at the beginning, but it is higher than the carbon dioxide yield after a certain period of time as the reaction proceeds. Based on the introduction of simulation tests, this article focuses on the basic characteristics of anaerobic composting methane production.
2 Experimental part
2.1 Experimental materials
The domestic waste comes from the garbage points in the living area of ​​Huazhong University of Science and Technology in Wuhan, and its basic composition is shown in Table 1.

Table 1 Basic composition of experimental materials (%)
Sawdust
cloth
Paper
plastic
rubber
Kitchen waste
Glass metal
Lime soil
3.0
2.3
4.6
11.0
2.7
51.0
4.3
21.1

2.2 Experimental device
The simulation experiment device is cylindrical, with a diameter of 600mm and a height of 1200mm. It is covered with thermal insulation cotton for thermal insulation. The bottom of the leachate collection port; the top two open
One port is connected to a vacuum pump for vacuuming, and the other is used to measure the gas production rate; the side wall is provided with two openings on the left and right, one is inserted with a thermometer to measure the temperature, and the other is used for sampling. The reaction device is shown in Figure 1.

Figure 1 Schematic diagram of the experimental device

About the author: Jiang Juan, female, director of the experimental branch of the School of Environmental Science and Engineering, Huazhong University of Science and Technology, engaged in experimental teaching and instrumentation research in environmental engineering.

2.3 Experimental instruments
The main instrument used in this experiment is the 9000D portable 4-component infrared analysis system produced by Beijing Huayun Analytical Instrument Research Institute.
The 9000D portable 4-component infrared analysis system is specially designed for measuring CO, CO2, CH4 and O2 produced in landfills. Sub-sampling system and host. During the measurement, the sampling probe is extended from the top of the anaerobic composting device to more than half of the interior, and the gas to be measured is drawn into the sampler by the suction pump in the sampler. The four three and a half LCD liquid crystal displays directly display the concentration value, with fast response speed, accurate value and long-term continuous work. In the host, CO, CO2, and CH4 use the non-dispersive infrared method, and O2 uses the electrochemical method. Among them, the optical components of CO use gas filtering related technologies. The gas analysis flow chart of this system is shown in Figure 2. The gas analysis system solves the shortcomings of slow data acquisition, easy transmission error and secondary pollution in the past, and is an online monitoring system with high accuracy and reliable performance.
2.4 Experimental method
First, manually sort the collected domestic garbage, and remove the non-degradable substances such as plastic, glass, metal, etc .; then use the quartile method to sample and load 500kg of garbage into the anaerobic composting device; due to the determination of the moisture content of the mixed garbage It is 30%, so after artificially adding water to 45% moisture content, cover and seal; during the test, the yield of methane and carbon dioxide during the composting process is measured by infrared analysis system.
3 Experimental results and analysis
When the experimental waste was loaded into the anaerobic composting device, it was initially in an aerobic environment. With the consumption of molecular oxygen, SO42- and NO3- and manual vacuuming, the device began to enter the anaerobic state necessary for methanogenic bacteria growth Methane and carbon dioxide. On the 15th day, the infrared analysis system was used to measure the methane and carbon dioxide yield in the device, and every 15 thereafter, the data is shown in Table 2.

Table 2: Gas yield during composting
time
15
I want to contribute

Sweep, welcome attention

Official WeChat of Educational Equipment Procurement Network

Master the latest and most authoritative information in the education equipment industry

Copyright and Disclaimer:

â‘  The copyright of all works on this website that indicate "Source: China Education Equipment Purchasing Network" belongs to China Education Equipment Purchasing Network, and may not be reproduced, edited or used in other ways without authorization from this website. Works that have been authorized by this website should be used within the scope of authorization, and indicate "Source: China Education Equipment Purchase Network". Violators of this website will be held accountable for legal liabilities.

â‘¡ All works on this website that indicate "Source: XXX (non-this website)" are reproduced from other media. The purpose of this reprint is to transmit more information. This does not mean that this website agrees with its views and is responsible for its authenticity. Take direct responsibility and joint liability for infringement of such works. If other media, websites or individuals download and use it from this website, they must keep the "source of the manuscript" indicated on this website, and bear the legal responsibility of copyright and other.

â‘¢ If the content of the work, copyright and other issues are involved, please contact this website within two weeks from the date of publication of the work, otherwise it is deemed to waive the relevant rights.

?
Latest equipment
More

No. 500 platinum colorimetric stock solution
Smart factory training system
Standard material of potassium dichromate solution
Portable mask particle and melt-blown cloth detector TD60 ...
Shanghai Sports Boxing Training Products
Aurora Video AURORA-X8220W5G Ultra HD Video Communication ...
Artificial intelligence and robots
Practice teaching integrated management platform software
RM-EC806 soil quality control sample--standard for X fluorescence analysis ...
CR infrared canopy temperature monitoring system
Interview
More

Qingdao Xinxin Sports: Why does Star shine for a long time?
Body Story Brand Story│Wilson's Three Logics in the Rise of Basketball
Qingdao Xinxin Sports: Why does Star shine for a long time? Body Story Brand Story│Wilson's three rises in basketball ... Tonghui Information: Creating VR Immersive Interactive Learning Environment for Students Blog Robot: Empowering Robot Education to Realize China's Intelligent Dreams and Convincing Technology to Make IT More Valuable Lida data helps predict the development of disciplines
Equipment observation
More
March campus network procurement: Fujian campus network project transaction volume first March school software system procurement: Fujian, Yunnan, Guangxi strength ... March school smart logistics equipment procurement basic education landing project accounted for ... March 2020 The smart tablet market for teaching equipment in Yunnan tops the list in March 2020. The school's recording and landing project in the field of basic education is far ahead of the school library procurement project statistics in March 2020: Fujian Province is stable ...
Solution Case
More

Ministry of Education releases "Guidelines on Epidemic Prevention in Colleges and Universities", Lanling Smart University Platform to help
Sanxiong Aurora helps school resume school and keep the classroom healthy lighting
Xpower Office & Tongji University
Baidu Intelligent Cloud continues to help epidemic prevention and control AI temperature measurement deployed in many primary schools such as Beijing Zhongguancun No. 2 Primary School
Newly settled
More
Beijing Hagong Huiyu Artificial Intelligence Technology Development Co., Ltd. Beijing Shuhua Sports Goods Co., Ltd. Beijing Aowei Video Technology Co., Ltd. Beijing Zhonghui Tiancheng Technology Co., Ltd. Beijing Zhuoli Hanguang Instrument Co., Ltd. Green Health Environmental Technology Development (Guangdong ) Limited
Government Procurement
More
[^ typename ^] Integrated construction items for teaching equipment and supplies ... [^ typename ^] Integrated construction items for teaching equipment and supplies ... [^ typename ^] Correction announcement for special laboratory equipment construction projects [^ typename ^] Procurement items of environmental microbiology laboratory equipment ... [^ typename ^] Procurement items of environmental microbiology laboratory equipment ... [^ typename ^] Logistics Department Procurement Target of Innovation Port Property Services ... [^ typename ^ ] Logistics Support Department Innovation Port Property Service Procurement Target ... [^ typename ^] Logistics Support Department Innovation Port Property Service Procurement Target ... [^ typename ^] Logistics Support Department Innovation Port Property Service Procurement Target ... [^ typename ^] Cleaning of water supply pipelines in the tap water of teachers' apartments
var _hmt = _hmt || []; (function () {var hm = document.createElement ("script"); hm.src = "//hm.baidu.com/hm.js?7bba69eb3c3832c2e03cd64b565141fc"; var s = document .getElementsByTagName ("script") [0]; s.parentNode.insertBefore (hm, s);}) (); (function () {var bp = document.createElement ('script'); var curProtocol = window.location .protocol.split (':') [0]; if (curProtocol === 'https') {bp.src = 'https://zz.bdstatic.com/linksubmit/push.js';} else {bp .src = 'http://push.zhanzhang.baidu.com/push.js';} var s = document.getElementsByTagName ("script") [0]; s.parentNode.insertBefore (bp, s);}) ();

Wooden Animal House

This quality 2 layer hutch provides a large cozy place for keeping small animals, especially rabbits.
It features multiple uses: playing, exercising, training, or simply keeping your pets safely.
This hutch provides your pets with plenty of exercise space while the tight iron wire mesh helps prevent mischievous behaviors and unexpected accidents.
Meanwhile, the construction of iron wire grid ensures your monitoring of the pets and enables your pets to keep an eye on the surroundings and get enough fresh air.
The hutch is built with a high-quality wood frame, making it a strong and safe enclosure that lasts for years. Its red roof keeps rain away while the cozy cubby makes the perfect sleeping area.
An easy-climb ladder leads from the lower ground level to the upper floor. A pull-out tray makes cleaning easy. And the doors close easily and lock with slide-bolt latches.
This spacious wooden rabbit cage is perfect for small pets.

Wooden Animal House,Wood Chicken Coop,Chicken Coop House,Wooden Hen House

HANGZHOU JIEYUN IMP & EXP CO., LTD , https://www.jaalex-garden.com