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A rapid evaluation method for anaerobic bioconversion of excess sludge for methane production

A technology of anaerobic biology and excess sludge, which is applied in the field of sludge anaerobic biological treatment, can solve the problems of cumbersome, easy-to-failure experiments, and long measurement cycle, and achieve the effects of avoiding experimental procedures, rapid and accurate evaluation, and broad application prospects

Active Publication Date: 2021-11-12
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problems of long measurement period, easy failure and cumbersome experiments in evaluating the methane production performance of sludge anaerobic bioconversion in the prior art, a sludge fractal dimension (D f ) and sludge particle surface site density (SSD) based on the determination equation of sludge anaerobic digestion efficiency, a rapid method for evaluating the anaerobic bioconversion of excess sludge to produce methane

Method used

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  • A rapid evaluation method for anaerobic bioconversion of excess sludge for methane production
  • A rapid evaluation method for anaerobic bioconversion of excess sludge for methane production
  • A rapid evaluation method for anaerobic bioconversion of excess sludge for methane production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] Three sludge samples (A-1, A-2, A-3) were taken in A sewage treatment plant, and the D f and SSD, denoted as D f -1,D f -2,D f -3 and SSD-1, SSD-2, SSD-3. It was found that D f -2(2.18)>D f -1(2.05)>D f -3 (2.00), SSD-2 (3.56 mmol / g VS)f It was judged that the anaerobic biotransformation methane production efficiency of A-2 sludge sample was the worst, followed by A-1, and A-3 anaerobic biotransformation methane production property was the best. In addition, a 30-day mesophilic BMP test experiment was conducted on the three samples with an inoculation ratio of 2:1, and the daily methane production was collected at the same time. After the experiment, k and NCMP were obtained by fitting the 30-day methanogenesis data using the pseudo-first-order methanogenesis kinetic model equation, which were denoted as k-1, k-2, k-3 and NCMP-1, NCMP- 2, NCMP-3. It was found that k-2(0.245 / d)4 / g VS)4 / g VS)4 / g VS), that is, the anaerobic biotransformation methane production e...

Embodiment 2

[0081] Three sludge samples (B-1, B-2, B-3) were taken in the B sewage treatment plant, and the D f and SSD, denoted as D f -1,D f -2,D f -3 and SSD-1, SSD-2, SSD-3. It was found that D f -3(2.24)>D f -1(1.90)>D f -2 (1.65), SSD-3 (2.64 mmol / g VS)f It is judged that the anaerobic biotransformation methane production efficiency of the sludge sample B-3 is the worst, followed by B-1, and the anaerobic biotransformation methane production performance of B-2 is the best. In addition, a 30-day mesophilic BMP test experiment was conducted on the three samples with an inoculation ratio of 2:1, and the daily methane production was collected at the same time. After the experiment, k and NCMP were obtained by fitting the 30-day methanogenesis data using the pseudo-first-order methanogenesis kinetic model equation, which were denoted as k-1, k-2, k-3 and NCMP-1, NCMP- 2, NCMP-3. It was found that k-3(0.204 / d)4 / g VS)4 / g VS)4 / g VS), that is, the anaerobic biotransformation metha...

Embodiment 3

[0083] Three sludge samples (C-1, C-2, C-3) were taken in C sewage treatment plant, and the D f and SSD, denoted as D f -1,D f -2,D f -3 and SSD-1, SSD-2, SSD-3. It was found that D f -1(2.61)>D f -2(2.36)>D f -3 (1.96), SSD-1 (3.18 mmol / g VS)fIt is judged that the anaerobic biotransformation methane production efficiency of C-1 sludge sample is the worst, C-2 is next, and C-3 anaerobic biotransformation methane production property is the best. In addition, a 30-day mesophilic BMP test experiment was conducted on the three samples with an inoculation ratio of 2:1, and the daily methane production was collected at the same time. After the experiment, k and NCMP were obtained by fitting the 30-day methanogenesis data using the pseudo-first-order methanogenesis kinetic model equation, which were denoted as k-1, k-2, k-3 and NCMP-1, NCMP- 2, NCMP-3. It was found that k-1(0.233 / d)4 / g VS)4 / g VS)4 / g VS), that is, the anaerobic biotransformation methane production efficienc...

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Abstract

The invention provides a method for quickly evaluating the methanogenesis of excess sludge through anaerobic biotransformation. The method is based on the structural characteristics of excess sludge, and uses the fractal dimension to characterize the compactness and looseness of the sludge structure. The sludge fractal dimension There is a significant negative correlation between the number and the methanogenesis potential of anaerobic biotransformation; based on the concept of sludge particle surface binding sites, it is found that there is a significant positive correlation between the density of sludge particle surface sites and the methanogenesis rate of sludge anaerobic biotransformation. Correlation; Therefore, combined with fractal dimension and surface site density, a decision equation has been built to evaluate the potential and rate of sludge methane production; compared with the existing evaluation method, the method of the present invention does not need to pass through a long-term biochemical methane potential experiment To evaluate the methane production efficiency of anaerobic biological conversion of excess sludge, avoiding cumbersome experimental procedures and long measurement cycles, and enriching the current index system for characterizing sludge properties, in the research and practice of sludge anaerobic biological treatment There are broad application prospects.

Description

technical field [0001] The invention belongs to the technical field of sludge anaerobic biological treatment, and in particular relates to a method for quickly evaluating methane production by anaerobic biological conversion of excess sludge. Background technique [0002] With the popularization and application of activated sludge method in sewage treatment plants, a large amount of waste sludge is produced. According to incomplete statistics, in 2018, my country's annual sludge output has exceeded 60 million tons (calculated at 80% moisture content). Sludge contains a large amount of pollutants, if not properly treated and disposed of, it will cause serious secondary pollution. Anaerobic digestion technology can recover energy (such as methane) while treating pollutants, and is the mainstream technology for comprehensive utilization of sludge resources. The methane production rate constant (k) and the net cumulative methane production (NCMP) are the main indicators for ev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/18C02F11/04
CPCC02F11/04G06F17/18Y02E50/30
Inventor 戴晓虎许颖李磊郑琳珂
Owner TONGJI UNIV