Minimization of sludge production in biological processes: an alternative solution for the problem of sludge disposal

2002 ◽  
Vol 46 (10) ◽  
pp. 63-70 ◽  
Author(s):  
S. Deleris ◽  
V. Geaugey ◽  
P. Camacho ◽  
H. Debellefontaine ◽  
E. Paul
Keyword(s):  
Biological Treatment ◽  
Reduction Process ◽  
Aeration Tank ◽  
Urban Wastewater ◽  
Combined System ◽  
Active Biomass ◽  
Sludge Disposal ◽  
Autotrophic Biomass ◽  
Sludge Settling ◽  
Sludge Production

A combined system associating activated sludge and ozonation was evaluated for the treatment of urban wastewater. Experiments have shown that 70% reduction in sludge production can be reached (compared to a reference system running in low loaded conditions Yobs = 0.28 g VSS.g COD-1) by applying an ozone dosage of 0.05 g O3/g VSStreated. Recycling of the ozonated sludge to the aeration tank induces a slight increase in effluent COD, but the biological treatment performance is maintained. Nitrification capabilities are not altered by the sludge reduction process and active biomass measurements revealed that autotrophic biomass seems to be less affected than the heterotrophs. Significant improvements in sludge settling characteristics are observed.

New combined system of biological process and intermittent ozonation for advanced wastewater treatment

1998 ◽  
Vol 38 (8-9) ◽  
pp. 145-153 ◽  
Author(s):  
T. Kamiya ◽  
J. Hirotsuji
Keyword(s):  
Biological Treatment ◽  
Biological Process ◽  
Waste Water Treatment ◽  
Aeration Tank ◽  
Excess Sludge ◽  
Combined System ◽  
Remarkable Effect ◽  
Effluent Quality ◽  
Treatment Processes ◽  
Sludge Settling

A new system combining both biological treatment and intermittent ozonation has been developed to reduce excess sludge production with a small amount of ozone. In this system, activated sludge in the aeration tank was circulated via intermittent ozonation. Experimental results have shown that 50% of the sludge generation was cut down with only 30% of the ozone dose required for continuous ozonation. Furthermore, the process had a remarkable effect on maintaining the sludge settling characteristics. The sludge ozonation was almost of little influence on the effluent quality though the slight degradation of effluent quality was observed in few cases. These facts suggested the effectiveness of the newly proposed system for saving costs and stabilizing treatment performance of biological waste water treatment processes.

Feasibility study of mechanically disintegrated sludge and recycle in the activated-sludge process

2002 ◽  
Vol 46 (10) ◽  
pp. 97-104 ◽  
Author(s):  
P. Camacho ◽  
V. Geaugey ◽  
P. Ginestet ◽  
E. Paul
Keyword(s):  
Activated Sludge ◽  
Mechanical Treatment ◽  
Aeration Tank ◽  
Urban Wastewater ◽  
Combined System ◽  
Action Mechanisms ◽  
First Pass ◽  
High Pressure Homogenizer ◽  
Biological Performance ◽  
Sludge Settling

The action mechanisms and performances of a combined system associating activated sludge and mechanical treatment (High Pressure Homogenizer) were evaluated for urban wastewater. Discontinuous experiments showed that the energy applied at the first pass was high enough to modify the sludge particulate fraction (high COD release) but without cell lysis. The applied shear forces led to a progressive cell break up (maximal COD release 90% total COD). Continuous experiments showed less than 20% reduction in sludge production (compared to a control run under the same loading conditions YTSS = 0.35 g TSS.g−1CODremoved through the application of mechanical treatment (stress frequency = 0.2 d−1). Recycling of mechanical treated sludge to the aeration tank induced a slight increase in effluent TSS, but the biological performance seemed to be maintained. Significant improvements in sludge settling characteristics were observed.

Sludge production based on organic matter and nitrogen removal performances

2011 ◽  
Vol 6 (2) ◽  
Author(s):  
N. Serón ◽  
S. Puig ◽  
S.C.F. Meijer ◽  
M.D. Balaguer ◽  
J. Colprim
Keyword(s):  
Organic Matter ◽  
Nitrogen Removal ◽  
Nutrient Removal ◽  
Biological Treatment ◽  
Wastewater Treatment Plants ◽  
The Other ◽  
Biological Nutrient Removal ◽  
Optimal Conditions ◽  
Urban Wastewater ◽  
Sludge Production

Excess biomass produced during the biological treatment of wastewater requires costly disposal. As environmental and legislative constraints increase, there is considerable impetus for reducing the sludge production. Nowadays, several strategies for minimizing it production are applied but high costs still limit their application in full-scale wastewater treatment plants (WWTPs). On the other hand, biological nutrient removal (BNR) process may have an impact on the sludge production. This paper deals with the effect on the organic matter and nitrogen performances on the sludge production treating urban wastewater. The results demonstrated that the sewage sludge production was reduced between 50 to 60% (0.38 to 0.16 kg VSS·kg−1 COD) while improving the nitrogen removal efficiency from 33% to 79%. Therefore, an efficient way to minimize the sludge production, it is by operating the WWTP in optimal conditions for nutrient removal.

Two-stage chemical-biological treatment at Thessaloniki greater area WWTP - experiences and potentials

1995 ◽  
Vol 32 (9-10) ◽  
pp. 75-84 ◽  
Author(s):  
A. D. Andreadakis ◽  
G. H. Kristensen ◽  
A. Papadopoulos ◽  
C. Oikonomopoulos
Keyword(s):  
Biological Treatment ◽  
Treatment Plant ◽  
Cost Effective ◽  
Primary Treatment ◽  
Effective Control ◽  
Two Stage ◽  
Effluent Quality ◽  
Filamentous Microorganisms ◽  
Sludge Settling ◽  
The City

The wastewater from the city of Thessaloniki is discharged without treatment to the nearby inner part of the Thessaloniki Gulf. The existing, since 1989, treatment plant offers only primary treatment and did not operate since the expected effluent quality is not suitable for safe disposal to the available recipients. Upgrading of the plant for advanced biological treatment, including seasonal nitrogen removal, is due from 1995. In the mean time, after minor modifications completed in February 1992, the existing plant was put into operation as a two-stage chemical-biological treatment plant for 40 000 m3 d−1, which corresponds to about 35% of the total sewage flow. The operational results obtained during the two years operation period are presented and evaluated. All sewage and sludge treatment units of the plant perform better than expected, with the exception of the poor sludge settling characteristics, due to severe and persistent bulking caused by excessive growth of filamentous microorganisms, particularly M. Parvicella. Effective control of the bulking problem could lead to more cost-effective operation and increased influent flows.

scholarly journals Compact Quantum Magnetometer System on an Agile Underwater Glider

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1092
Author(s):  
Brian R. Page ◽  
Reeve Lambert ◽  
Nina Mahmoudian ◽  
David H. Newby ◽  
Elizabeth L. Foley ◽  
...  
Keyword(s):  
Test Procedure ◽  
Reduction Process ◽  
Ground Truth ◽  
Sensor Technology ◽  
Magnetic Data ◽  
Magnetic Survey ◽  
Underwater Glider ◽  
Combined System ◽  
Extended Operation ◽  
Quantum Magnetometer

This paper presents results from the integration of a compact quantum magnetometer system and an agile underwater glider for magnetic survey. A highly maneuverable underwater glider, ROUGHIE, was customized to carry an increased payload and reduce the vehicle’s magnetic signature. A sensor suite composed of a vector and scalar magnetometer was mounted in an external boom at the rear of the vehicle. The combined system was deployed in a constrained pool environment to detect seeded magnetic targets and create a magnetic map of the test area. Presented is a systematic magnetic disturbance reduction process, test procedure for anomaly mapping, and results from constrained operation featuring underwater motion capture system for ground truth localization. Validation in the noisy and constrained pool environment creates a trajectory towards affordable littoral magnetic anomaly mapping infrastructure. Such a marine sensor technology will be capable of extended operation in challenging areas while providing high-resolution, timely magnetic data to operators for automated detection and classification of marine objects.

Long term experience with the nutrient limited BAS process for treatment of forest industry wastewaters

2007 ◽  
Vol 55 (6) ◽  
pp. 89-97 ◽  
Author(s):  
Å. Malmqvist ◽  
T. Welander ◽  
L.E. Olsson
Keyword(s):  
Biological Treatment ◽  
Operating Mode ◽  
Full Scale ◽  
Forest Industry ◽  
Process Stability ◽  
Sludge Characteristics ◽  
Long Term Treatment ◽  
Different Types ◽  
Sludge Production

The nutrient limited biofilm-activated sludge (BAS) process was developed with the aim to ensure maximum biological treatment efficiency in combination with good process stability, low sludge production and minimum effluent concentration of nutrients. The first full scale nutrient limited BAS (NLBAS) processes were implemented at Södra Cell Värö and Stora Enso Hylte in 2002. Since then another three full scale installations have been built. The aim of this study was to investigate and summarise the long-term treatment results, process stability, sludge production and sludge characteristics for the five full scale NLBAS processes. It was of particular interest to compare the nutrient limited operating mode with regard to the different types of production and wastewater that the mills represent (kraft, TMP and newsprint, bleached CTMP). The study showed that after the initial start-up period, which varied from a couple of weeks to three to four months, all plants meet their respective discharge limits. The sludge production for the different plants varies between 0.07 and 0.15 kg TSS/kg COD and the sludge characteristics are with few exceptions excellent. In conclusion, the nutrient limited BAS process is suitable for both upgrades and new installations of biological treatment for different types of forest industry wastewaters.

Anaerobic-Aerobic Combined System for the Biological Treatment of Azo Dye Solution using Residual Yeast

2018 ◽  
Vol 90 (8) ◽  
pp. 729-737 ◽  
Author(s):  
Marina Bahia ◽  
Fabiana Passos ◽  
Oscar F. H. Adarme ◽  
Sergio F. Aquino ◽  
Silvana Q. Silva
Keyword(s):  
Azo Dye ◽  
Biological Treatment ◽  
Combined System

Microbial community dynamics in a submerged fixed bed bioreactor during biological treatment of saline urban wastewater

2014 ◽  
Vol 71 ◽  
pp. 126-132 ◽  
Author(s):  
C. Cortés-Lorenzo ◽  
D. Sipkema ◽  
M. Rodríguez-Díaz ◽  
S. Fuentes ◽  
B. Juárez-Jiménez ◽  
...  
Keyword(s):  
Microbial Community ◽  
Biological Treatment ◽  
Community Dynamics ◽  
Fixed Bed ◽  
Urban Wastewater ◽  
Microbial Community Dynamics ◽  
Fixed Bed Bioreactor

Removal of hydrogen sulfide from an anaerobic biogas using a bio-scrubber

1997 ◽  
Vol 36 (6-7) ◽  
pp. 349-356 ◽  
Author(s):  
Sosuke Nishimura ◽  
Motoyuki Yoda
Keyword(s):  
Hydrogen Sulfide ◽  
Simulation Model ◽  
Biological Treatment ◽  
Gas Flow ◽  
Treatment Process ◽  
Aeration Tank ◽  
Wastewater Treatment Process ◽  
Bubble Tray ◽  
Sulfur Oxidizing ◽  
Biological Treatment Process

A novel biological treatment process for removing hydrogen sulfide from anaerobic biogas using a bio-scrubber has been developed. The treatment process is composed of a gas/liquid contact tower and an aeration tank. The biogas from an anaerobic wastewater treatment process is introduced into a multiple-bubble-tray contact tower (bio-scrubber) and scrubbed with activated sludge liquor from an aeration tank. The sludge liquor containing sulfides is then returned to the aeration tank, where the sulfide is oxidized to sulfate by sulfur-oxidizing bacteria such as Thiobacillus. The contact tower is designed to be air tight in order to prevent air from mixing into the biogas used as a fuel. A simulation model was developed to calculate effluent gas concentrations from the contact tower, incorporating input parameters such as influent hydrogen sulfide concentrations, gas flow rates, and gas/liquid ratios. Using the simulation model, design criteria were calculated and a full-scale plant for treating biogas from a UASB process for potato processing wastewater was constructed. The data shows that the hydrogen sulfide in the biogas was effectively reduced from 2,000 ppm to less than 20 ppm.

Sludge reduction and performance analysis of a modified sludge reduction process

2013 ◽  
Vol 69 (5) ◽  
pp. 934-940 ◽  
Author(s):  
Zhen Zhou ◽  
Weimin Qiao ◽  
Can Xing ◽  
Yingjun Wang ◽  
Chunying Wang ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Nitrogen Concentration ◽  
Oxygen Demand ◽  
Reduction Process ◽  
Ammonium Nitrogen ◽  
Aeration Tank ◽  
Sludge Reduction ◽  
Oxidation Reduction ◽  
Solids Retention ◽  
And Performance

A modified sludge process reduction activated sludge (SPRAS) technology was developed by inserting a sludge process reduction (SPR) module, composed of an aeration tank and a settler, before the activated sludge system was proposed in this study. Compared with the anaerobic/anoxic/aerobic (AAO) process, the SPRAS resulted in a remarkable decrease in sludge production by 76.6%; sludge decay owing to lengthy solids retention time (about 121.5 d) could be the major cause. During the 217-day operation, the oxidation-reduction potential (ORP) (from 54 to −198 mV) and pH (from 7.8 to 5.0) at the bottom of the SPR settler gradually decreased, and low ORP and pH were in favor of sludge reduction in the SPRAS system. The insertion of the SPR module improved the removal efficiencies of suspended solids, chemical oxygen demand and ammonium nitrogen, and total nitrogen concentration in the effluent was reduced from 23.89 ± 4.82 to 14.16 ± 3.98 mg/L by 50% influent bypassing the SPR module. These results indicated that the SPRAS process could produce much less excess sludge and guarantee better effluent quality than the AAO process.

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