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Study on Simultaneous Removal of Lignin and Silica from Wastewater of Wheat Straw High-yield Pulp and Subsequent Treatment Approach
Received:January 03, 2025  Revised:February 27, 2025
DOI：10.11981/j.issn.1000-6842.2025.04.122
Key Words:wastewater;wheat straw high-yield pulp;lignin;silica;coagulation;biodegradability
Author NameAffiliationPostcode
SUN Yuru* Tianjin Key Lab of Pulp and Paper Industry， Tianjin University of Science and Technology， Tianjin， 300457 300457
QI Jian Tianjin Port Xingyang Machinery Co.， Ltd.， Tianjin， 300452 300452
LYU Pengjing Tianjin Key Lab of Pulp and Paper Industry， Tianjin University of Science and Technology， Tianjin， 300457 300457
YANG Yuxin Tianjin Key Lab of Pulp and Paper Industry， Tianjin University of Science and Technology， Tianjin， 300457 300457
DU Peiqing Tianjin Port Xingyang Machinery Co.， Ltd.， Tianjin， 300452 300452
HUANG Jinda Tianjin Port Xingyang Machinery Co.， Ltd.， Tianjin， 300452 300452
CHEN Yan Beijing Keyin Media Culture Co.， Ltd.， Beijing， 100036 100036
ZHU Yong China Light Paper Products Inspection and Certification Co.， Ltd.， Beijing， 100102 100102
LIU Chunlan Shandong Kemai Biological Pulp Co.， Ltd.， Weifang， Shandong Province， 262400 262400
YU Menghui* Tianjin Key Lab of Pulp and Paper Industry， Tianjin University of Science and Technology， Tianjin， 300457 300457
WANG Gaosheng Tianjin Key Lab of Pulp and Paper Industry， Tianjin University of Science and Technology， Tianjin， 300457 300457
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Abstract:
      This study investigated the simultaneous removal of lignin and silicon from wastewater of lab-simulated wheat straw high-yield pulp using aluminum sulfate flocculation to mitigate the inhibition of lignin on anaerobic digestion and the interference of silicon during combustion of concentrated high-yield pulping wastewater. The feasibilities of two treatment pathways of evaporation combustion and anaerobic digestion for the flocculated wastewater were evaluated. The results showed that under experimental conditions with aluminum sulfate dosage of 0.25~4.0 g/L and final pH value of wastewater of 5~10， wastewater turbidity removal rate exhibited highly linear correlations with both lignin and silicon removal rates. The optimal removal efficiencies of lignin （80.7%） and silicon （53.7%） were achieved at aluminum sulfate dosage of 2.5 g/L and final pH value of wastewater of 7. After coagulation， the biodegradability， methane production rate， and cumulative methane yield of the wastewater increased by 39.4%， 60.5%， and 25.4%， respectively， compared to the raw wastewater. Moreover， the viscosity of the wastewater concentrated to 20% solid content was reduced by 73.9%. Based on the 1 000 kg of wastewater， the combustion heat obtained via the evaporation-combustion pathway （51.22 MJ） was higher than that from methane combustion via anaerobic digestion （37.60 MJ）， indicating that evaporation combustion was the preferable treatment option under these conditions.
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