Insight into the generation and consumption mechanism of tightly bound and loosely bound extracellular polymeric substances by mathematical modeling

生物量(生态学) 化学 沉淀 机制(生物学) 细胞外 絮凝作用 胞外聚合物 水解 Zeta电位 化学工程 生物化学 生化工程 环境科学 环境工程 生物膜 生物 细菌 有机化学 纳米颗粒 物理 量子力学 农学 工程类 遗传学
作者
Lulu Xing,Jixian Yang,Bing‐Jie Ni,Chao Yang,Chunyan Yuan,Ang Li
出处
期刊:Science of The Total Environment [Elsevier BV]
卷期号:811: 152359-152359 被引量:22
标识
DOI:10.1016/j.scitotenv.2021.152359
摘要

The quantity of tightly bound extracellular polymeric substances (TB-EPS) and loosely bound extracellular polymeric substances (LB-EPS) are recognized to be crucial for activated sludge flocculability and settleability. However, the generation and consumption mechanisms of TB-EPS and LB-EPS are vague, and there is no effective model to quantitatively predict LB-EPS and TB-EPS. In this work, a decrease in LB-EPS and TB-EPS was verified to increase the absolute value of the zeta potential and decrease the sludge settling volume, which affects the flocculation and settling performance of sludge. Hence, we comparatively developed, calibrated and validated two different mathematical model structure (named expanded unified model-TL1 and expanded unified model-TL2), aiming to systematically reveal the generation and consumption mechanism of TB-EPS and LB-EPS and quantitatively predict changes of TB-EPS and LB-EPS. On the basis of microbial physiology and the existing literature, two different mechanisms of the generation and consumption of TB-EPS and LB-EPS are described. According to the validation performed, expanded unified model-TL2 fit better with experimental TB-EPS and LB-EPS, which described with the hypotheses: (i) TB-EPS and LB-EPS are simultaneously generated while activate biomass growth on external substrate, (ii) LB-EPS can also be hydrolyzed by TB-EPS, and (iii) Biomass-associated products (BAP) are hydrolyzed by LB-EPS, and it was further proven to be more realistic from the perspective of microbial physiology. This study systematically revealed the generation and consumption mechanism of TB-EPS and LB-EPS by mathematical modeling, and provides a basis for regulating the concentrations of them to improve sludge settling capacity and system stability.
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
范范发布了新的文献求助10
1秒前
1秒前
我爱吃菜完成签到,获得积分10
2秒前
2秒前
赎罪完成签到 ,获得积分10
3秒前
Qsss完成签到,获得积分10
4秒前
ya发布了新的文献求助10
4秒前
4秒前
练得身形似鹤形完成签到 ,获得积分10
5秒前
5秒前
5秒前
6秒前
鹿港猫妖完成签到,获得积分20
7秒前
chen完成签到,获得积分10
7秒前
8秒前
阿湫发布了新的文献求助10
8秒前
8秒前
9秒前
崔悦欣发布了新的文献求助10
9秒前
希望天下0贩的0应助kk子采纳,获得10
10秒前
丰富的不惜完成签到,获得积分10
12秒前
票子发布了新的文献求助10
12秒前
华仔应助魏莱采纳,获得10
12秒前
F123发布了新的文献求助10
13秒前
shen发布了新的文献求助10
14秒前
14秒前
苗觉觉完成签到,获得积分10
15秒前
帕金森完成签到,获得积分10
16秒前
活力的妙芙完成签到,获得积分10
16秒前
赘婿应助疯子魔煞采纳,获得10
17秒前
橙橙橙完成签到,获得积分10
17秒前
17秒前
你好CDY完成签到,获得积分10
18秒前
18秒前
18秒前
万能图书馆应助希尔伯特采纳,获得10
18秒前
我是老大应助123采纳,获得10
19秒前
芒果小鹌鹑完成签到,获得积分10
20秒前
上官若男应助F123采纳,获得10
21秒前
Singularity应助邢文瑞采纳,获得10
22秒前
高分求助中
【提示信息,请勿应助】关于scihub 10000
Les Mantodea de Guyane: Insecta, Polyneoptera [The Mantids of French Guiana] 3000
徐淮辽南地区新元古代叠层石及生物地层 3000
The Mother of All Tableaux: Order, Equivalence, and Geometry in the Large-scale Structure of Optimality Theory 3000
Global Eyelash Assessment scale (GEA) 1000
Picture Books with Same-sex Parented Families: Unintentional Censorship 550
Research on Disturbance Rejection Control Algorithm for Aerial Operation Robots 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 4038446
求助须知:如何正确求助?哪些是违规求助? 3576149
关于积分的说明 11374627
捐赠科研通 3305875
什么是DOI,文献DOI怎么找? 1819354
邀请新用户注册赠送积分活动 892680
科研通“疑难数据库(出版商)”最低求助积分说明 815048