Deep mechanism of enhanced dewaterability of residual sludge by Na+: Comprehensive analyses of intermolecular forces, hydrophilicity and water-holding capacity of EPS

作者
Wei Lin,Renglu Chen,Xiao Liu,Huu Hao Ngo,Jun Nan,Guibai Li,Jun Ma,Xu He,An Ding
出处
期刊:Chemical Engineering Journal [Elsevier BV]
卷期号:450: 138505-138505 被引量:12
标识
DOI:10.1016/j.cej.2022.138505
摘要

Extracellular polymeric substance (EPS) is generally considered as the limiting factor affecting sludge dewatering due to its complex components and water-holding capacity. Conventional flocculation conditioning could improve the dewaterability by generating a certain number of channels for water discharge. However, the hydrophilicity and water-holding capacity of EPS still cannot change, resulting in the inability to further consolidate sludge dewaterability. To overcome this challenge, the study explores the application ability of sodium chloride via Na+ conditioning for sludge dewatering and compared with calcium chloride (CaCl2) and ferric chloride (FeCl3) conditioning effects. Results confirmed that the specific resistance to filtration (SRF) and water content (WC) fell dramatically from 14.3 × 1012 m/kg to 8.1 × 1012 m/kg and 80.8 % to 75.4 %, respectively, at the Na+ concentration of 80 mmol/L. The mechanism investigations indicated that addition of Na+ clearly destroyed the structure of EPS and promoted the declines in hydrophilicity and water-holding capability of EPS, resulting in much less bound water, changes in secondary structure and functional groups (e.g. NH, and CO) of EPS proteins. Furthermore, analyses of surface thermodynamic illustrated that the aggregation ability of sludge enhanced after the conditioning of Na+ combined with re-flocculation. Additionally, compared with Ca2+ and Fe3+, applying the combined conditioning method led to stronger hydrophobicity of EPS through the analysis of two-dimension correlation spectroscopy (2D-COS). This work can drive innovation in applying salty water containing sodium for effectively sludge dewatering.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
斯文败类应助Lord采纳,获得10
刚刚
1秒前
1秒前
墨菲特发布了新的文献求助10
2秒前
2秒前
顾矜应助jojo采纳,获得10
3秒前
灌肠高手发布了新的文献求助10
3秒前
康康发布了新的文献求助10
4秒前
星辰大海应助晨晨尼采纳,获得10
4秒前
Spencer完成签到 ,获得积分10
4秒前
炙热雅琴发布了新的文献求助10
5秒前
big烂泥完成签到,获得积分10
5秒前
乐乐应助YYT采纳,获得10
6秒前
phoenix001发布了新的文献求助10
6秒前
羽翼完成签到,获得积分10
7秒前
唠叨的宝马完成签到,获得积分20
7秒前
量子星尘发布了新的文献求助30
7秒前
8秒前
8秒前
9秒前
顾难摧完成签到 ,获得积分10
9秒前
俭朴的小熊猫完成签到,获得积分10
9秒前
10秒前
10秒前
11秒前
www完成签到,获得积分10
11秒前
搜集达人应助lianqing采纳,获得10
11秒前
思源应助kiwiii采纳,获得10
11秒前
爆米花应助灌肠高手采纳,获得10
12秒前
jojo完成签到,获得积分10
12秒前
垃圾桶发布了新的文献求助10
13秒前
13秒前
Morty完成签到,获得积分10
13秒前
FashionBoy应助芝麻芝麻开门采纳,获得10
14秒前
Zxc发布了新的文献求助10
14秒前
14秒前
汤圆发布了新的文献求助10
14秒前
C女士发布了新的文献求助10
15秒前
科研通AI5应助daidaimumu采纳,获得10
16秒前
17秒前
高分求助中
A new approach to the extrapolation of accelerated life test data 1000
Cognitive Neuroscience: The Biology of the Mind 1000
Technical Brochure TB 814: LPIT applications in HV gas insulated switchgear 1000
Toward a Combinatorial Approach for the Prediction of IgG Half-Life and Clearance 500
ACSM’s Guidelines for Exercise Testing and Prescription, 12th edition 500
Picture Books with Same-sex Parented Families: Unintentional Censorship 500
Nucleophilic substitution in azasydnone-modified dinitroanisoles 500
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 3970004
求助须知:如何正确求助?哪些是违规求助? 3514701
关于积分的说明 11175468
捐赠科研通 3250051
什么是DOI,文献DOI怎么找? 1795187
邀请新用户注册赠送积分活动 875630
科研通“疑难数据库(出版商)”最低求助积分说明 804925