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Microwave pretreatment sludge used in the electrical properties of microbial fuel cell research

Author: ZhouXiuDong
Tutor: ZhaoQingLiang
School: Harbin Institute of Technology
Course: Environmental Science and Engineering
Keywords: Sludge Microbial fuel cell Microwave pretreatment Organic removal Electricity production
CLC: X703.1
Type: Master's thesis
Year: 2011
Downloads: 241
Quote: 0
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Abstract


With China's rapid development of the cause of sewage treatment, sewage sludge as a byproduct of generating capacity is also increasing, great harm to the environment. Anaerobic digestion technology is currently the most widely used sludge recycling technology, but because of its long sludge retention time, high energy consumption, operation and maintenance complex, rigorous reaction conditions, so we are anxious to develop sludge stabilization and energy recovery new technology. The results showed that the microbial fuel cell in the degradation of organic matter at the same time be able to organic matter in the form of chemical energy to electrical energy recovery, which is not only capable of simple carbs as fuel for power generation, but also from a variety of sewage (waste) water organic pollutants in energy recovery, with low power consumption, residence time is short, mild reaction conditions and so on. This paper introduces MFC technology for sludge treatment, comparing different reactor configurations MFC muddy sludge treatment process and changes in the electrical properties of organic matter degradation and productivity, MFC can only use soluble organic matter as fuel, while the organic matter in the sludge mainly solid phase, expected to improve through the pretreatment of soluble organic matter content of the sludge to improve MFC electricity production and organic matter degradation. Microwave pretreatment with penetrating strong, uniform heating, high efficiency heat, so this paper sludge as the research object, using microwave pretreatment technologies that facilitate the dissolution of organic matter, in order to improve the MFC on the degradation rate of organic matter in the sludge and MFC and the original mud degradation compared electricity production, while using response surface methodology (RSM) analysis of microwave pretreatment Lixiviation muddy and investigation of microwave pretreated sludge MFC running on the impact of shale. The results show that using microwave technology crack sludge floc and can damage cell structure, making the solid phase organic matter transferred to the liquid phase, increasing the solubility of liquid organic substances. As the ratio of the added value of the microwave energy, the microwave heating time increases, increasing the microwave energy and the heating time can be compared to obtain a high SCOD, proteins and polysaccharides dissolution values. Meanwhile, compared to air cathode MFC reactor, the reactor has a double-chamber MFC better degradation of organic matter and producing electrical performance to the sludge as a substrate in a dual-chamber MFC start time of 20 h, regulated output voltage is 0.60 V , the maximum output power of 2.79 W/m3, single chamber air cathode MFC's maximum output voltage of 0.366 V, maximum output power of 1.25 W/m3, the latter two running 8d TCOD removal rates were 34.14% and 22.67%, double chamber MFC has a higher coulombic efficiency during operation and ammonia removal can be achieved. Microwave pretreatment can improve the degradation of organic matter and the MFC power performance, with an increase in the specific energy of microwave, MFC's startup time, while the output voltage and maximum output power density has increased to certain extent, but the output voltage stabilization time shortening, 1 W / mL pretreated MFC's start time of 10 h, stable output voltage is 0.645 V, the maximum output power of 3.30 W/m3, corresponding to 3 W / mL respectively of 5 h, 0.70 V, 3.78 W/m3. With the increase of the specific energy of microwave pretreatment, MFC in sludge TCOD removal and coulombic efficiency are improved, 1 W / mL and 3 W / mL microwave pretreated sludge than can run 8 d in the MFC when TCOD removal respectively, 35.28% and 43.73%, respectively, 2.84% coulombic efficiency and 2.96%. As we introduce the microwave technology, it is with traditional anaerobic digestion technology to compare the calculated results show that microwave energy consumption and the energy needed for anaerobic digestion considerably, MFC treatment sludge reduces sludge retention time, which is still more cost-effective . By volumetric power, infrastructure costs, stability, etc. sludge MFC electricity production compared with anaerobic digestion, MFC has to adapt to the temperature found wide anti-load capacity and stability, short startup time, etc., can be Sludge Treatment future to provide new ideas.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization > Technology and methods
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