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Thermophilic Anaerobic Co-digestion of Swine Manure with Corn Stover for Biogas Production.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Thermophilic Anaerobic Co-digestion of Swine Manure with Corn Stover for Biogas Production./
Author:	Liu, Zhimin.
Description:	1 online resource (150 pages)
Notes:	Source: Dissertation Abstracts International, Volume: 78-10(E), Section: B.
Contained By:	Dissertation Abstracts International78-10B(E).
Subject:	Environmental engineering. -
Online resource:	click for full text (PQDT)
ISBN:	9781369856392

Thermophilic Anaerobic Co-digestion of Swine Manure with Corn Stover for Biogas Production.
Liu, Zhimin.

Thermophilic Anaerobic Co-digestion of Swine Manure with Corn Stover for Biogas Production. - 1 online resource (150 pages)

Source: Dissertation Abstracts International, Volume: 78-10(E), Section: B.

Thesis (Ph.D.)--North Carolina State University, 2017.

Includes bibliographical references

The transition of anaerobic digestion from mesophilic to thermophilic conditions using a one-step temperature jump from 35 °C to 50 °C was first studied in two continuously stirred tank reactors (CSTR) treating swine wastewater and corn stover. Both reactors were operated at constant organic loading rate of 1.074 kg VS/m3/d and hydraulic retention time (HRT) of 25 days. Although the one-step temperature jump from 35 °C to 50 °C resulted in severe fluctuation of daily methane production and volatile fatty acids concentrations, the systems reached stability after 25 days. It can be concluded that the strategy for changing temperature from mesophilic to thermophilic condition using one-step temperature jump is feasible in anaerobic CSTR treating swine wastewater and corn stover. In comparison with mesophilic anaerobic digestion, thermophilic anaerobic digestion performed better in regards to daily gas production, specific gas yield and chemical oxygen demand (COD) removal. The effects of HRT was investigated and it was shown that the system could be operated at an HRT as low as 5 days.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9781369856392Subjects--Topical Terms:

557376
Environmental engineering.
Index Terms--Genre/Form:

554714
Electronic books.

Thermophilic Anaerobic Co-digestion of Swine Manure with Corn Stover for Biogas Production.
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100 1 $a Liu, Zhimin. $3 1191170
245 1 0 $a Thermophilic Anaerobic Co-digestion of Swine Manure with Corn Stover for Biogas Production.
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300 $a 1 online resource (150 pages)
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500 $a Source: Dissertation Abstracts International, Volume: 78-10(E), Section: B.
500 $a Adviser: Jay J. Cheng.
502 $a Thesis (Ph.D.)--North Carolina State University, 2017.
504 $a Includes bibliographical references
520 $a The transition of anaerobic digestion from mesophilic to thermophilic conditions using a one-step temperature jump from 35 °C to 50 °C was first studied in two continuously stirred tank reactors (CSTR) treating swine wastewater and corn stover. Both reactors were operated at constant organic loading rate of 1.074 kg VS/m3/d and hydraulic retention time (HRT) of 25 days. Although the one-step temperature jump from 35 °C to 50 °C resulted in severe fluctuation of daily methane production and volatile fatty acids concentrations, the systems reached stability after 25 days. It can be concluded that the strategy for changing temperature from mesophilic to thermophilic condition using one-step temperature jump is feasible in anaerobic CSTR treating swine wastewater and corn stover. In comparison with mesophilic anaerobic digestion, thermophilic anaerobic digestion performed better in regards to daily gas production, specific gas yield and chemical oxygen demand (COD) removal. The effects of HRT was investigated and it was shown that the system could be operated at an HRT as low as 5 days.
520 $a The effect of sodium hydroxide (NaOH), lime (Ca(OH)2) and the combined NaOH and Ca(OH)2 pretreatment on corn stover were investigated in this study. Digestions were performed in 12 L laboratory-scale CSTR operated with an organic loading rate of 1.074 kg VS/m3/d. HRT was 5 days and the operating temperature was 50 °C. The results of methane fermentation study on alkaline pretreated corn stover had resulted into significant amount of increase in biogas as well as methane yields. NaOH pretreated corn stover produced 30.95% higher biogas yield and 36.84% higher methane yield compared to the untreated corn stover. Lime pretreated corn stover had resulted into an increase of 32.43% in biogas yield and 37.50% in methane yield compared to that of untreated corn stover. Combination of NaOH and lime-treated corn stover had resulted into an increase of 38.10% in biogas yield and 44.44% in methane yield compared to that of untreated corn stover.
520 $a The effect of total solids (TS) concentration on anaerobic co-digestion of swine manure and corn stover was further investigated in CSTR at solid content of 2.5%, 4% and 5.5%. Digestions were performed in 12 L laboratory-scale CSTR with operating temperature at 50 °C and HRT of 5 days. The daily loading of swine manure and corn stover was mixed at a mass ratio of 3:1 to achieve a carbon/nitrogen (C/N) ratio of 30 in the mixture and was diluted to desired TS concentration. The Analysis of Variance (ANOVA) showed that the gas yield from the various TS% was significantly different (p < 0.05). The results indicated that the gas yield decreased with the increase in the solid content. Higher gas yield achieved at lower TS concentration was attributed to overloading of the substrates. COD and VS reduction were the highest when the reactor was operated at TS of 2.5%.
520 $a A mathematical model has been developed to describe the swine manure and corn stover co-digestion process. This model includes multiple-reaction stoichiometry, microbial growth kinetics with acetic acid inhibitory effects and conventional material balances for an ideally mixed reactor. The ordinary differential equations (ODE) of the model were coded in RStudioRTM software and integrated using the package deSolve. A laboratory batch experiment using swine manure and corn stover as substrates was conducted to calibrate the model. The kinetic parameters used in the model were adjusted for thermophilic conditions and were estimated using least square variation method. Bootstrap is used to estimate the standard error and 95% confidence interval of model kinetic parameters. The applicability of the model was demonstrated by comparing experimental results from literature with the model simulation results.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
650 4 $a Environmental engineering. $3 557376
650 4 $a Agricultural engineering. $3 1148660
655 7 $a Electronic books. $2 local $3 554714
690 $a 0775
690 $a 0539
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a North Carolina State University. $b Biological and Agricultural Engineering. $3 1191171
773 0 $t Dissertation Abstracts International $g 78-10B(E).
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10610756 $z click for full text (PQDT)