Pilot-scale study of step-feed anaerobic coupled four-stage micro-oxygen gradient aeration process for treating digested swine wastewater with low carbon/nitrogen ratios

被引：7

作者：

Tang, Hang ^{[1
,2
]}

Ma, Zhuang ^{[3
]}

Qin, Yong ^{[1
,2
,5
]}

Wu, Hanghang ^{[4
]}

Xu, Xingkun ^{[1
,2
]}

Xin, Liqing ^{[1
,2
]}

Wu, Weixiang ^{[1
,2
]}

机构：

[1] Zhejiang Univ, Inst Environm Sci & Technol, Coll Environm & Resource Sci, Hangzhou 310058, Peoples R China

[2] Zhejiang Prov Key Lab Water Pollut Control & Envir, Hangzhou 310058, Zhejiang, Peoples R China

[3] Zhejiang Transper Environm Protect Technol Co Ltd, Hangzhou 310058, Peoples R China

[4] Guangdong Prov Acad Environm Sci, Guangzhou 510045, Guangdong, Peoples R China

[5] 866 Yuhangtang Rd, Hangzhou 310058, Peoples R China

来源：

BIORESOURCE TECHNOLOGY | 2023年 / 380卷

关键词：

Nitrogen removal; Low dissolved oxygen; Nitrite accumulation; Mass balance; Simultaneous partial nitrification and  denitrification; ENHANCING NITROGEN REMOVAL; PARTIAL NITRIFICATION; ORGANIC-CARBON; DENITRIFICATION; PERFORMANCE; NITRITE; COMMUNITY; TECHNOLOGY; BACTERIA; SLUDGE;

D O I：

10.1016/j.biortech.2023.129087

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

This study developed an innovative step-feed anaerobic coupled four-stage micro-oxygen gradient aeration process to treat digested swine wastewater. An anaerobic zone was used for prepositive denitrification; four micro-oxygen reactors (zones O1-O4) were used for simultaneous partial nitrification and denitrification through low-dissolved oxygen gradient control, step-feed, and swine wastewater-digested swine wastewater distribution. The nitrogen-removal efficiency was satisfactory (93 +/- 3 %; effluent total nitrogen, 53 +/- 19 mg/L). Mass balance coupled with quantitative polymerase chain reaction analysis revealed that simultaneous partial nitrification and denitrification was achieved in four micro-oxygen zones. Zones O1 were the major denitrification zones for nitrogen removal; nitrification was primary happened in zones O2 and O3. Correlation analysis confirmed that low-dissolved oxygen gradient control was the key to achieving efficient nitrogen removal. This study provides a low oxygen energy consumption method to treat digested swine wastewater with a low carbon/nitrogen ratio (<3).

引用

页数：10