EFFECTS OF SOLIDS CONCENTRATION ON CAPILLARY SUCTION TIME AS A MEASUREMENT METHOD OF WASTEWATER SLUDGE DEWATERABILITY

2004 ◽  
Vol 2004 (14) ◽  
pp. 389-395
Author(s):  
Jianpeng Zhou
Keyword(s):  
Measurement Method ◽  
Wastewater Sludge ◽  
Capillary Suction ◽  
Solids Concentration ◽  
Sludge Dewaterability

Municipal wastewater sludge dewaterability and the presence of microbial extracellular polymer

2001 ◽  
Vol 44 (2-3) ◽  
pp. 373-379 ◽  
Author(s):  
J. J. Houghton ◽  
J. Quarmby ◽  
T. Stephenson
Keyword(s):  
Municipal Wastewater ◽  
Extraction Process ◽  
Wastewater Sludge ◽  
Optimum Level ◽  
Wastewater Treatment Process ◽  
Capillary Suction ◽  
Sludge Dewaterability ◽  
The Uk ◽  
The Relationship ◽  
Extracellular Polymer

Dewatering of sewage sludge is an essential and costly part of the wastewater treatment process. The presence of microbial extracellular polymer (ECP) is important for sludge flocculation, but ECP has also been shown to have a detrimental effect on the dewaterability of certain sludge types. This paper investigates the relationship between sludge dewaterability and the level of ECP present in a range of sludges obtained from 8 full-scale municipal treatment works in the UK. Sludge dewaterability was determined using the capillary suction time (CST) test, and a thermal extraction process followed by solvent precipitation was used for ECP extraction. The results indicate that for each type of sludge examined there appears to be an optimum level of ECP (raw sludge 20 mg ECP/g SS; activated sludge 35 mg ECP/g SS; digested sludge 10 mg ECP/g SS) at which the sludge should exhibit maximum dewaterability. The establishment of a trend between sludge dewaterability and the quantity of ECP present opens up the possibility of manipulating the level of microbial polymer present to aid sludge dewatering, and hence reduce plant operating costs.

Capillary suction time (CST) as a measure of sludge dewaterability

1996 ◽  
Vol 34 (3-4) ◽  
pp. 443-448 ◽  
Author(s):  
G. W. Chen ◽  
W. W. Lin ◽  
D. J. Lee
Keyword(s):  
Water Content ◽  
Specific Resistance ◽  
Bound Water ◽  
The Other ◽  
Solid Concentration ◽  
Capillary Suction ◽  
Good Index ◽  
Other Hand ◽  
Sludge Dewaterability ◽  
Bound Water Content

The feasibility of employment of capillary suction time (CST) for characterizing the dewaterability of excess activated sludges was examined. The CST was shown as a good index for sludge filterability, if only the product of solid concentration and average specific resistance is of interest. On the other hand, the bound water content cannot be directly evaluated from the CST data.

scholarly journals Wastewater sludge dewaterability enhancement using hydroxyl aluminum conditioning: Role of aluminum speciation

2016 ◽  
Vol 105 ◽  
pp. 615-624 ◽  
Author(s):  
Bingdi Cao ◽  
Weijun Zhang ◽  
Qiandi Wang ◽  
Yangrui Huang ◽  
Chenrui Meng ◽  
...  
Keyword(s):  
Wastewater Sludge ◽  
Aluminum Speciation ◽  
Sludge Dewaterability

scholarly journals Investigating the effects of different cationic charge flocculation polymers on municipal wastewater sludge dewatering

2021 ◽  
Author(s):  
Megan Abrahams ◽  
Mujahid Aziz ◽  
Godwill Kasongo
Keyword(s):  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Operating Cost ◽  
Wastewater Sludge ◽  
Municipal Wastewater Treatment ◽  
Bench Scale ◽  
Treated Effluent ◽  
Solids Concentration ◽  
Municipal Wastewater Treatment Plants ◽  
Polymer Flocculant

Abstract The minimization of sludge produced by municipal wastewater treatment plants (MWWTPs) is critical as its handling accounts for approximately 50% of the total operating cost. The challenges in predicting dewatering performance can be overcome by optimizing the sludge treatment process, especially conditioning and dewatering. This study aimed to investigate sludge dewaterability at four different MWWTPs, using a gravity drainage test unit and a bench-scale press. The effect of differently treated effluent used as a solvent to mix the flocculation polymers was observed during dewatering. The membrane bioreactor (MBR) treated effluent yielded the highest filtrate volume in the lowest amount of time, with the least polymer flocculant dosage. The Box Behnken Design model fitted the data and proved a relationship between polymer dosage, cake solids concentration, and cake height during the bench-scale press tests.

scholarly journals The influence of different sludge concentrations on its dewaterability during bioleaching

2020 ◽  
Vol 81 (12) ◽  
pp. 2585-2598
Author(s):  
Wenfeng Yang ◽  
Liyuan Zeng ◽  
Weihao Zhang ◽  
Qiyong Yang ◽  
Tianfeng Wang ◽  
...  
Keyword(s):  
Extracellular Polymeric Substances ◽  
Reduction Potential ◽  
High Efficiency ◽  
Specific Resistance ◽  
Principal Component ◽  
Buffering Capacity ◽  
Capillary Suction ◽  
Oxidation Reduction ◽  
Oxidation Reduction Potential ◽  
Sludge Dewaterability

Abstract Bioleaching, a technologically and economically feasible technology, is considered as the high efficiency method to improve dewaterability in sewage sludge. The objective of this study was to investigate the effect of different sludge concentrations on bioleaching dewaterability and understand the mechanism of the effect of bioleaching on sludge dewaterability. Variation in pH, oxidation-reduction potential (ORP), capillary suction time (CST), specific resistance to filtration (SRF) and different fractions of extracellular polymeric substances (EPS) including slime EPS (S-EPS), loosely bound EPS (LB-EPS), and tightly bound EPS (TB-EPS) were determined. Different sludge concentrations (5, 10, 15, 20 and 30 g·L−1) were selected to investigate during bioleaching. Results indicated that sludge buffering capacity significantly inhibited bioleaching efficiency as sludge concentrations increased. Optimum enhancements in sludge dewaterability were observed during the 10 g·L−1 sludge concentration treatment, and reached a maximum when the pH was 2.11. The variation of different fractions of EPS revealed that the ratio of S-EPS/TB-EPS significantly affected sludge dewaterability. Principal component analysis and Pearson's correlation analysis both provided evidence that the higher TB-EPS followed by a very large reduction was positively correlated with sludge dewaterability. However, the increase of protein and DNA in S-EPS content was negatively correlated with sludge dewaterability.

scholarly journals Performance and mechanism of sludge dewaterability enhanced by potassium ferrate pretreatment and calcium chloride addition

2016 ◽  
Vol 7 (2) ◽  
pp. 136-141 ◽  
Author(s):  
Yali Liu ◽  
Xiaorong Kang ◽  
Xin Li ◽  
Zheng Wang ◽  
Zhaoqian Jing
Keyword(s):  
Calcium Chloride ◽  
Extracellular Polymeric Substances ◽  
Three Dimensional ◽  
Negative Relationship ◽  
Potassium Ferrate ◽  
Optimal Parameters ◽  
Capillary Suction ◽  
Potential Benefits ◽  
Sludge Dewaterability ◽  
Microscopy Images

The potential benefits and mechanisms of potassium ferrate pretreatment and calcium chloride addition on sludge dewaterability were investigated in this study. The capillary suction time (CST) was used to evaluate sludge dewaterability. Results indicated that potassium ferrate of 0.1 g/g total solids (TS) and calcium chloride of 0.4 g/g TS were optimal parameters, and corresponding CST reached 43.7 s. Soluble organics in extracellular polymeric substances (EPS) were determined by three-dimensional excitation-emission matrix fluorescence spectroscopy, which was used to explain the mechanism of sludge dewaterability. The fluorescence intensities of protein-like and humic-like substances in EPS had a negative relationship with the CST. Scanning electron microscopy images indicated that calcium chloride neutralized the surface charge of particles, making the soluble protein-like substances agglomerate and form bigger flocs, consequently enhancing sludge dewaterability.

STUDY OF THE POSSIBILITY OF USING MICROWAVE RADIATION FOR THE TREATMENT OF LIQUID MUNICIPAL WASTE

2018 ◽  
Vol 8 (1) ◽  
pp. 44-49
Author(s):  
Viktor I. KICHIGIN ◽  
Marina V. ZEMLYANOVA ◽  
Elena A. VYALKOVA
Keyword(s):  
Heavy Metal ◽  
Sewage Sludge ◽  
Activated Sludge ◽  
Electromagnetic Radiation ◽  
Microwave Radiation ◽  
Wastewater Sludge ◽  
Municipal Waste ◽  
Capillary Suction ◽  
Metal Impurities ◽  
Fi Ltration

The article is devoted to the study of the infl uence of microwave electromagnetic radiation (UHF EMP) on the properties of sewage sludge. The possibility of using microwave radiation for their processing is shown. The results of experiments confi rming the positive eff ect of the process under study on the degree and speed of compaction of a mixture of precipitation and activated sludge, improvement of their moisture yield, an increase in the yield of heavy metal impurities in decanted water, a decrease in the specifi c resistance of fi ltration and capillary suction of the sediment, precipitation. A hypothesis is proposed for the eff ect of UHF EMP on wastewater sludge.

Wastewater sludge as a potential raw material for antagonistic fungus (Trichoderma sp.): Role of pre-treatment and solids concentration

2005 ◽  
Vol 39 (15) ◽  
pp. 3587-3596 ◽  
Author(s):  
Mausam Verma ◽  
Satinder K. Brar ◽  
R.D. Tyagi ◽  
J.R. Valéro ◽  
R.Y. Surampalli
Keyword(s):  
Wastewater Sludge ◽  
Raw Material ◽  
Solids Concentration ◽  
Trichoderma Sp ◽  
Pre Treatment

scholarly journals Insight into the comparison of thermally and Fe(II) activated persulfate on sludge dewaterability and disintegration

2021 ◽  
Author(s):  
Shaodong Guo ◽  
Long Zhou ◽  
Yuxin Huang ◽  
Xinghu Huang
Keyword(s):  
Extracellular Polymeric Substances ◽  
Three Dimensional ◽  
Oxygen Demand ◽  
Ammonia Nitrogen ◽  
Fluorescence Excitation ◽  
Capillary Suction ◽  
Extracellular Polymer Substance ◽  
Sludge Dewaterability ◽  
Oxidation Efficiency ◽  
Degradation Effect

Abstract The effects of thermally and Fe(II) activated potassium persulfate (PPS) on sludge dewatering performance were compared systematacially. Sludge dewaterability was monitored by measuring capillary suction time (CST) and sludge specific resistance to filtration (SRF), and the degradation effect was characterized by Chemical oxygen demand (COD), total organic carbon (TOC), ammonia nitrogen (NH4+-N) and extracellular polymeric substances (EPS). The Change of extracellular polymer substance (EPS) including soluble, loosely bound and tightly bound EPS (S-EPS, LB-EPS and TB-EPS) with time and PPS dosage was monitored to discuss the oxidation efficiency of thermally and Fe(II) activated PPS. Sludge supernate were analyzed by three dimensional fluorescence excitation-emission spectrum (3D-EEM) to confirm the proteins transformation. The result showed that sludge dewaterability in terms of CST and SRF were enhanced with increasing PPS dosage and condition time of both two activated methods. While Fe(II) activated PPS could reduce sludge CST and SRF to preferred values at low PPS dosage and short condition time. Maenwhile, sludge degradation effect was also more obvious. Mechanically, sludge TB-EPS in proteins and polysaccharides converted to SB-EPS was more quickly with Fe(II) activated PPS. Besides, thermally activated PPS tended to oxidize the protein in the supernatant first.

Sign in / Sign up

Export Citation Format

Share Document