A comparative study of waste activated sludge conditioning with Fe(II)-peroxymonosulfate oxidative process

2020 ◽  
Vol 11 ◽  
pp. 100434
Author(s):  
Wanqing Ding ◽  
Wenbiao Jin ◽  
Xu Zhou ◽  
Lan Wang ◽  
Yibin Xiu ◽  
...  
Keyword(s):  
Comparative Study ◽  
Activated Sludge ◽  
Waste Activated Sludge ◽  
Oxidative Process ◽  
Sludge Conditioning

Waste activated sludge conditioning by direct slurry freezing

1975 ◽  
Vol 9 (10) ◽  
pp. 917-925 ◽  
Author(s):  
Clifford W. Randall ◽  
M.Z. Ali Khan ◽  
N.Thomas Stephens
Keyword(s):  
Activated Sludge ◽  
Waste Activated Sludge ◽  
Sludge Conditioning

Waste activated sludge disintegration by hydroxyl and sulfate radical-based oxidation: a comparative study

2019 ◽  
Vol 5 (11) ◽  
pp. 2027-2040 ◽  
Author(s):  
Hanife Sari Erkan
Keyword(s):  
Hydrogen Peroxide ◽  
Comparative Study ◽  
Activated Sludge ◽  
Sulfate Radical ◽  
Waste Activated Sludge ◽  
Calcium Hypochlorite

To the best of my knowledge, this is the first study in the literature where hydrogen peroxide, calcium hypochlorite, peroxymonosulfate and peroxydisulfate were comparatively investigated in a study.

Sludge conditioning by using alumina nanoparticles and polyelectrolyte

2007 ◽  
Vol 56 (8) ◽  
pp. 125-132 ◽  
Author(s):  
Z.S. Wang ◽  
M.T. Hung ◽  
J.C. Liu
Keyword(s):  
Activated Sludge ◽  
Paper Industry ◽  
Cationic Polyelectrolyte ◽  
Alumina Nanoparticles ◽  
Waste Activated Sludge ◽  
Capillary Suction ◽  
Floc Size ◽  
Combined Use ◽  
Retention Aids ◽  
Sludge Conditioning

The combined use of nanoparticle and polyelectrolyte as retention aids in pulp and paper industry tend to give better flocculation (retention) and drainage (dewatering) than conventional polyelectrolyte flocculation. The combined use of alumina nanoparticle and polyelectrolyte in conditioning waste activated sludge was investigated in the current study. Alumina with three different sizes (139.5, 241.7, and 326.4 nm) was utilized in combination with a cationic polyelectrolyte (T3052) of molecular weight of 1.1 × 107 and charge density of 2.1 meq/g. It was found from capillary suction time (CST) and specific resistance to filtration (SRF) measurement that sludge conditioned with alumina/polyelectrolyte showed a better dewaterability than polyelectrolyte alone. In addition, it was found that the better dewaterability was obtained as alumina became smaller. Floc size and fractal dimension of flocs were examined as well. The mechanism of enhanced dewaterability was proposed that alumina nanoparticles became adsorbed onto sludge and positive patches were formed. The electrostatic repulsion made the polyelectrolyte more stretched, and resulted in more effective flocculation and bridging as polyelectrolyte was added. Dosing sequence also affected the conditioning effectiveness. However, the combined use of silica nanoparticles and a cationic polelectrolyte, KP-201C, or alumina nanoparticles and an anionic polyelectrolyte, AP410, did not result in improved dewaterability of waste activated sludge. Possible explanation was discussed. Preliminary results show that some in-depth work is needed regarding the introduction of nanoparticles in sludge conditioning.

scholarly journals Enhancement the conditioning of waste activated sludge through a sequence of freeze/thaw-electro-Fenton process

2018 ◽  
Vol 20 (1) ◽  
pp. 47-53 ◽  
Author(s):  
Narjes Shahheidar ◽  
Sahand Jorfi ◽  
Afshin Takdastan ◽  
Neemat Jaafarzadeh ◽  
Mehdi Ahmadi
Keyword(s):  
Activated Sludge ◽  
Specific Resistance ◽  
Current Intensity ◽  
Freezing Process ◽  
Waste Activated Sludge ◽  
Fenton Process ◽  
Solution Ph ◽  
Sludge Dewatering ◽  
Freeze Thaw ◽  
Sludge Conditioning

Abstract Sludge conditioning is an important stage in sludge management. In the present study, a sequence of freeze/thaw-electro-Fenton process was designed and specific resistance filtration (SRF) was monitored during sludge conditioning as an important factor in sludge dewaterability. Furthermore, protein and polysaccharide concentrations were measured during the experiments. Results showed that the lowest SRF value contributed to −10°C in freezing process which showed a reducing trend by decreasing solution pH. In addition, results revealed that solution pH less than 3 caused a significant improvement in sludge dewatering; so the lowest SRF has been registered at pH = 2. By increasing current intensity from 0.5 to 1A, SRF values were reduced and then followed by an enhancement with increasing current intensity to 3.2 A. The lowest SRF value (6.1 × 104 m/kg) was obtained at H2O2 = 30 mg/L which was the best conditions for sludge dewatering.

A comparative study between mechanical, thermal and oxidative disintegration techniques of waste activated sludge

2002 ◽  
Vol 46 (10) ◽  
pp. 79-87 ◽  
Author(s):  
P. Camacho ◽  
S. Deleris ◽  
V. Geaugey ◽  
P. Ginestet ◽  
E. Paul
Keyword(s):  
Comparative Study ◽  
Activated Sludge ◽  
Contact Time ◽  
Waste Activated Sludge ◽  
Sludge Flocs ◽  
Oxidative Treatment ◽  
Mineral Fraction ◽  
Wide Range ◽  
Micro Organisms ◽  
Limiting Value

The release performances of an organic and mineral activated sludge matrix were studied for a wide range of disintegration treatments like mechanical, thermal, thermal-chemical and oxidative disintegration techniques. The maximal COD release was 35% of total COD after 24 hours contact time at 95°C. A limiting value of 60% COD release was obtained for 500 and 700 bars after 10 passes. Concerning the oxidative disintegration techniques (O3 and H2O2), a limiting value of around 60-65% of TOC release was observed. Therefore, it was hypothesised that thermal and mechanical treatments allow mainly for breaking apart the micro-organisms while the oxidative treatment destroys the sludge flocs and disrupts the micro-organisms. A release effect of the mineral fraction is observed only oxidative disintegration techniques.

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