Combined pretreatment using CaO and liquid fraction of digestate of rice straw: Anaerobic digestion performance and electron transfer

Ruolin Guan; Hairong Yuan; Liang Zhang; Xiaoyu Zuo; Xiujin Li

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Combined pretreatment using CaO and liquid fraction of digestate of rice straw: Anaerobic digestion performance and electron transfer

Resources and Environmental Technology | Updated：2026-01-06

- Combined pretreatment using CaO and liquid fraction of digestate of rice straw: Anaerobic digestion performance and electron transfer
- Chinese Journal of Chemical Engineering Vol. 36, Issue 8, Pages: 223-232(2021)
- Affiliations：
  
  Department of Environmental Science and Engineering, Beijing University of Chemical Technology,Beijing,China,100029
- Author bio：
- Funds：
- DOI：
  CLC：
- Published：2021
- Accepted：
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Ruolin Guan, Hairong Yuan, Liang Zhang, Xiaoyu Zuo, Xiujin Li. Combined pretreatment using CaO and liquid fraction of digestate of rice straw: Anaerobic digestion performance and electron transfer[J]. Chinese Journal of Chemical Engineering, 2021, 36(8): 223-232.
DOI：

Ruolin Guan, Hairong Yuan, Liang Zhang, Xiaoyu Zuo, Xiujin Li. Combined pretreatment using CaO and liquid fraction of digestate of rice straw: Anaerobic digestion performance and electron transfer[J]. Chinese Journal of Chemical Engineering, 2021, 36(8): 223-232. DOI：

摘要

Abstract

To improve anaerobic digestion (AD) efficiency of rice straw

solid alkaline CaO and the liquid fraction of digestate (LFD) were used as pretreatment agents of rice straw. The results showed that AD performance of rice straw with CaO -LFD pretreatment was optimal in different pretreatment methods of the CaO + LFD

CaO -LFD

LFD + CaO

CaO

and LFD. The maximum methane yield (314 ml·(g VS)

-1

) and the highest VFAs concentration (14851 mg·L

-1

on day 3) of the CaO -LFD pretreatment group were 81% and 118% higher than that of the control group

respectively. Under the action of solid alkaline CaO

the bacteria of

Clostridium

Atopostipes

Sphaerochaeta

Tissierella

Thiopseudomonas

Rikenellaceae

and

Sedimentibacter

could build up co-cultures with the archaeal of

Methanosaeta

Methanobacterium

and

Methanosarcina

performing direct interspecies electron transfer (DIET) and improving AD performance of rice straw. Therefore

the combined pretreatment using CaO and LFD could not only pretreat rice straw but also stimulate co-cultures of microorganism to establish DIET enhancing A

D efficiency.

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