Related Experiment Video
Updated: Jan 27, 2026
07:50
Open-source Toolkit: Benchtop Carbon Fiber Microelectrode Array for Nerve Recording
Published on: October 29, 2021
3.2K
[Comparison and optimization of cellulose carbon source for denitrification filter]
1Key Laboratory of Beijing for Water Quality Science and Water Environmental Recovery Engineering, College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China. woxianhuo@163.com
Huan Jing Ke Xue= Huanjing Kexue
|June 27, 2013
Summary
Corncob effectively removes nitrate in reclaimed water, serving as a superior carbon source for denitrification biofilters. Its high dissolved organic matter supports microbial growth and biofilm formation, outperforming other agricultural wastes in long-term efficiency.
Area of Science:
- Environmental Science
- Water Treatment Engineering
- Microbiology
Background:
- Advanced denitrification is crucial for reclaimed water treatment.
- Agricultural wastes offer potential as sustainable carbon sources for denitrification.
- Selecting appropriate filter media and carbon sources impacts treatment efficiency.
Purpose of the Study:
- To analyze carbon release from agricultural wastes (cotton, rice hull, rice straw, corncob).
- To evaluate the long-term denitrification efficiency and bio-attachment of these wastes.
- To identify the most suitable waste for advanced denitrification biofilters.
Main Methods:
- Analysis of dissolved organic matter (DOM) quantity and quality from four agricultural wastes.
- Laboratory-scale denitrification experiments to assess efficiency and bio-attachment.
- Comparative evaluation of nitrate removal over time.
Main Results:
- Corncob released the highest initial DOM, beneficial for microbial growth and biofilm formation.
- Corncob demonstrated superior long-term denitrification efficiency, removing 284.544 g of nitrate per 2.5 g of corncob in 46 days.
- Rice straw showed the lowest denitrification efficiency due to poor microbial utilization.
Conclusions:
- Corncob is the most suitable agricultural waste for use as a denitrification biofilter medium and carbon source.
- While cotton and rice hull showed initial promise, their long-term efficiency was lower than corncob.
- Effective selection of carbon sources is key to optimizing advanced reclaimed water treatment.
Related Concept Videos
01:27Sources of Self-Esteem III: Social Comparison
255
Social comparison plays a fundamental role in the evaluation of personal success and self-worth. Rather than assessing our achievements in isolation, we interpret their significance relative to personal goals and critically in comparison to the performance of others. A grade of B in a mathematics exam might elicit pride if one's expectation was a C, yet result in disappointment if an A was anticipated or if peers achieved superior results. These comparative evaluations illustrate how both...
255
01:27Passive Filters
974
Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff...
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff...
974
02:57The Sense of Self: Reflected Self-Appraisal and Social Comparison
55.6K
According to Charles Cooley, we base our image on what we think other people see (Cooley 1902). We imagine how we must appear to others, then react to this speculation. We don certain clothes, prepare our hair in a particular manner, wear makeup, use cologne, and the like—all with the notion that our presentation of ourselves is going to affect how others perceive us. We expect a certain reaction, and, if lucky, we get the one we desire and feel good about it. But more than that, Cooley...
55.6K
01:25Active Filters
1.3K
Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
1.3K
01:14The Carbon Cycle
43.3K
Carbon is the basis of all organic matter on Earth, and is recycled through the ecosystem in two primary processes: one in which carbon is exchanged among living organisms, and one in which carbon is cycled over long periods of time through fossilized organic remains, weathering of rocks, and volcanic activity. Human activities, including increased agricultural practices and the burning of fossil fuels, has greatly affected the balance of the natural carbon cycle.
43.3K
01:15Cellulose and Pectic Polysaccharides
4.7K
Every plant cell has a cell wall that protects the cell, provides structural support, and gives the cell shape. Cellulose, the main structural component of the plant cell wall, makes up over 30% of plant matter. It is the most abundant organic compound on earth. Cellulose is an unbranched polysaccharide composed of linear chains of glucose molecules linked by β (1→4) glycosidic bonds.
As a cell matures, its cell wall specializes according to its type. For example, the...
As a cell matures, its cell wall specializes according to its type. For example, the...
4.7K