scholarly journals Nitrogen aeration alters the spatial distribution and metal adsorption of extracellular polymeric substances in waste-activated sludge

RSC Advances ◽  
2019 ◽  
Vol 9 (58) ◽  
pp. 33981-33989
Author(s):  
Ying Liu ◽  
Wenzhou Lv ◽  
Siqing Xia ◽  
Zhiqiang Zhang
Keyword(s):  
Spatial Distribution ◽  
Activated Sludge ◽  
Extracellular Polymeric Substances ◽  
Metal Adsorption ◽  
Waste Activated Sludge

Nitrogen aeration was superior to air aeration because of the higher EPS production and Pb2+ adsorption in the utilization of WAS.

scholarly journals Influencing characteristics of short-time aerobic digestion on spatial distribution and adsorption capacity of extracellular polymeric substances in waste activated sludge

RSC Advances ◽  
2018 ◽  
Vol 8 (56) ◽  
pp. 32172-32177 ◽  
Author(s):  
Ying Liu ◽  
Wenzhou Lv ◽  
Zhiqiang Zhang ◽  
Siqing Xia
Keyword(s):  
Spatial Distribution ◽  
Activated Sludge ◽  
Adsorption Capacity ◽  
Extracellular Polymeric Substances ◽  
Waste Activated Sludge ◽  
Aerobic Digestion ◽  
Short Time

The spatial distribution and adsorption capacity of extracellular polymeric substances (EPS) were systematically investigated for waste activated sludge (WAS) treated by a short-time aerobic digestion (STAD) process.

Extracellular polymeric substances and dewaterability of waste activated sludge during anaerobic digestion

2014 ◽  
Vol 70 (9) ◽  
pp. 1555-1560 ◽  
Author(s):  
Fenxia Ye ◽  
Xinwen Liu ◽  
Ying Li
Keyword(s):  
Anaerobic Digestion ◽  
Activated Sludge ◽  
Extracellular Polymeric Substance ◽  
Extracellular Polymeric Substances ◽  
Waste Activated Sludge ◽  
Sludge Dewatering ◽  
Capillary Suction ◽  
Relationship Analysis ◽  
The Relationship ◽  
Insight Into

Anaerobic digestion of waste activated sludge was conducted to gain insight into the mechanisms underlying change in sludge dewaterability during its anaerobic digestion. Unexpectedly, the results indicated that sludge dewatering properties measured by capillary suction time only deteriorated after 10 days of anaerobic digestion, after which dewaterability recovered and remained stable. The loosely bound extracellular polymeric substance (LB-EPS) content increased three-fold after 20 days of anaerobic digestion, and did not change significantly during the remaining 30 days. The tightly bound EPS (TB-EPS) content reduced slightly after 20 days of anaerobic digestion, and stabilized during the last 30 days. Polysaccharides (PS) and proteins (PN) content in LB-EPS increased after 10 days of anaerobic digestion. However, PS and PN contents in TB-EPS decreased slightly. The relationship analysis showed that only LB-EPS correlated with dewaterability of the sludge during anaerobic digestion.

scholarly journals Enhancing Phosphorus Recovery and Dewaterability of Waste Activated Sludge for Combined Effect of Thermally Activated Peroxydisulfate and Struvite Precipitation

2021 ◽  
Vol 13 (17) ◽  
pp. 9700
Author(s):  
Zicong Liao ◽  
Yongyou Hu ◽  
Yuancai Chen ◽  
Jianhua Cheng
Keyword(s):  
Activated Sludge ◽  
Extracellular Polymeric Substances ◽  
Phosphorus Recovery ◽  
Waste Activated Sludge ◽  
Optimal Conditions ◽  
Capillary Suction ◽  
Radical Oxidation ◽  
Thermally Activated ◽  
Struvite Precipitation ◽  
The Cost

Phosphorus is a nonrenewable and irreplaceable limited resource, and over 90% of phosphorus in influenttransfers into sludge in wastewater treatment plants. In this study, thermally activated peroxydisulfate (TAP) treatment was combined with struvite precipitation to enhance waste activated sludge (WAS) dewaterability and phosphorus recovery. TAP simultaneously enhanced dewaterability and solubilization of WAS. The optimal conditions of TAP treatment were PDS dosage 2.0 mmol/g TSS, 80 °C, pH 4.0~7.0 and 40 min, which enhanced dewaterability (capillary suction time (CST) from 94.2 s to 28.5 s) and solubilization (PO43−-P 177.71 mg/L, NH4+-N 287.22 mg/L and SCOD 10754 mg/L). Radical oxidation disintegrated tightly bound extracellular polymeric substances (TB-EPS) and further released bound water. The acidification effect neutralized the negative surface charge of colloid particles. Compared with thermal hydrolysis, TAP effectively promoted the release of PO43−, NH4+ and SCOD. Cation exchange removed most Ca and Al of the TAP treated supernatant. The optimal conditions of struvite precipitation were Mg/P 1.4 and pH 10.0, which achieved phosphorus recovery of 95.06% and struvite purity of 94.94%. The income obtained by struvite adequately covers the cost of struvite precipitation and the cost of WAS treatment is acceptable.

EPS solubilization and waste activated sludge acidification enhanced by alkaline-assisted bi-frequency ultrasonic pretreatment revealed by 3D-EEM fluorescence

RSC Advances ◽  
2016 ◽  
Vol 6 (84) ◽  
pp. 80493-80500 ◽  
Author(s):  
Jing Peng ◽  
Kaili Wen ◽  
Wenzong Liu ◽  
Xiuping Yue ◽  
Aijie Wang ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Extracellular Polymeric Substances ◽  
Waste Activated Sludge ◽  
Ultrasonic Pretreatment ◽  
Eem Fluorescence

The effect of alkaline-assisted bi-frequency (28 + 40 kHz) ultrasonic pretreatment on extracellular polymeric substances (EPS) solubilization and waste activated sludge (WAS) acidification was investigated.

scholarly journals Effects of Waste Activated Sludge Extracellular Polymeric Substances on Biosorption

Water ◽  
2022 ◽  
Vol 14 (2) ◽  
pp. 218
Author(s):  
Tiow Ping Wong ◽  
Roger W. Babcock ◽  
Theodore Uekawa ◽  
Joachim Schneider ◽  
Bing Hu
Keyword(s):  
Organic Matter ◽  
Activated Sludge ◽  
Humic Acids ◽  
Extracellular Polymeric Substances ◽  
Contact Process ◽  
Cation Exchange Resin ◽  
Waste Activated Sludge ◽  
Untreated Wastewater ◽  
Biosorption Process ◽  
Raw Wastewater

Extracellular polymeric substances (EPS) reportedly make up approximately half of the organic matter in activated sludge (AS), and therefore strongly influence AS properties. This study evaluated the component fractions of EPS normalized to volatile suspended solids (VSS) in waste activated sludge (WAS) from a trickling-filter-solids contact process (TF/SC) and its ability to biosorb organic matter from raw wastewater with 30 min of contact time. Biosorption is the process in which organic matter (carbohydrates, proteins, humic acids, DNA, uronic acids, and lipids) in a sorbate, such as raw wastewater, sorbs onto a sorbent such as WAS. A statistically significant correlation was found between both the total concentration of EPS and the proteins component of the EPS and the biosorption removal of soluble chemical oxygen demand (sCOD) and truly soluble COD (ffCOD). Thus, the biosorption of soluble forms of COD can accurately be predicted by quantifying just the amount of proteins in WAS-associated EPS. No significant correlations were found for the biosorption of colloidal COD (cCOD). WAS biosorbed 45–75 mg L−1 of COD in 30 min. WAS absorbed or stored the proteins fraction of the soluble microbial products (SMP) during the biosorption process. Higher concentrations of humic acids were found in the biosorption process effluent than in the untreated wastewater, which warrants further study. Longer cation exchange resin (CER) extraction times yielded more total EPS from the sludge: 90 ± 9, 158 ± 3, and 316 ± 44 mg g−1 VSS, for 45-min, 4-h, and 24-h extraction times, respectively. Thus, EPS extracted represented only 9%, 15.8%, and 31.6% of the VSS, respectively, raising questions about whether the accurate characterization of EPS can be performed using the typical extraction time of 45 min due to different extraction rates for different components. It was found that the humic acids fraction was extracted much more slowly than the other fractions.

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