Sludge Volume Index Articles on Environmental XPRT

Pollution reduction and biodegradability index improvement of tannery effluents

Al2 (SO4)3, 18H2O, FeCl3 and Ca (OH)2 were used for the treatment of tannery wastewaters. The influences of pH and coagulant dosages were studied. Conditions were optimised according to the pollutant removal efficiencies, the volume of decanted sludge and the biodegradability index improvement. The results indicate that 67-71% of total COD, 76-92% of color and 79-97% of chromium can be removed ...

Dec. 26, 2007

By Center for Environment and Energy Research & Studies (CEERS)

Carbonization of johkasou sludge using batch-type equipment

The carbonization of dehydrated johkasou sludge was examined using batch-type equipment. Based on the temperature changes in the carbonization room and the gas combustion room, the carbonization process was divided into three phases: phase I, drying the sludge, phase II, thermal decomposition of the dried sludge, phase III, after phase II. The times required for phases I and II were strongly ...

Mar. 1, 2005

By Springer

Granulation of anaerobic sludge in the sulfate-reducing up-flow sludge bed (SRUSB) of SANI<sup>®</sup> process

Granulation of anaerobic sludge in the sulfate-reducing up-flow sludge bed (SRUSB) of SANI^® process

This study reports on anaerobic sludge granulation in a laboratory-scale sulfate-reducing up-flow sludge bed (SRUSB) in a novel sulfate reduction, autotrophic denitrification and nitrification integrated (SANI®) process for treatment of saline sewage. Granulation occurred in 30 d and reached full development in 90 d. The sulfate-reducing granules grew up to around 1 mm after 90 d with 21 ...

Aug. 8, 2013

By IWA Publishing

Isolation of Extra Cellular Biopolymer Producing Microorganisms from Wastewater Sludge for Sludge Settling and Dewatering

Sludge settling and dewatering are carried out by employing cationic synthetic polymer (CSP) in municipal and industrial wastewater treatment plant. CSP are expensive and further pollute the environment, hence to address these problems bioflocculation of sludge was examined in this study. Microorganisms were isolated from municipal and industrial wastewater sludges and six extracellular polymeric ...

Oct. 21, 2006

By Water Environment Federation (WEF)

Acclimation of the trichloroethylene-degrading anaerobic granular sludge and the degradation characteristics in an upflow anaerobic sludge blanket reactor

The granulation process was examined in an 8 L laboratory upflow anaerobic sludge blanket (UASB) reactor using synthetic wastewater contained trichloroethylene (TCE). Glucose and lactate were used as primary substrates. The anaerobic bacteria biomass were acclimated and granulated by increasing the chemical oxygen demand (COD) and TCE loadings. Anaerobic sludge was acclimated successfully in 120 ...

Jan. 16, 2014

By IWA Publishing

Efficient nitrogen removal for wastewater in compartmentalised activated sludge process

Studies were conducted on two aerobic-anaerobic configurations of the activated sludge process for nitrogen removal from domestic wastewater. An initial anaerobic stage followed by aerobic, anaerobic and aerobic stages provided best total Kjeldahl nitrogen removal. This profile was selected for conducting further experiments on the effect on nitrogen removal of the hydraulic loading and the food ...

Sep. 17, 2009

By Inderscience Publishers

The investigation of the sludge reduction efficiency and mechanisms in oxic–settling–anaerobic (OSA) process

This paper aims to provide a full understanding of the sludge reduction mechanisms in the oxic–settling–anaerobic (OSA) process and presents an evaluation of the sludge reduction efficiencies and sludge characteristics in this process compared to the conventional activated sludge process. Fifty-eight percent reduction in observed yield in the OSA process was achieved compared to the control ...

Feb. 6, 2016

By IWA Publishing

Assessment Of Single-Walled Carbon Nanotubes On Activated Sludge Wastewater Treatment Process

This paper evaluated the impact of 95% purified single-walled carbon nanotubes (SWCNTs) on the activated sludge wastewater treatment process through a batch-scale study. We found that the SWCNTs adsorbed 22% of the soluble COD (sCOD, chemical oxygen demand). One-way ANOVA analysis revealed that only four experimental parameters, i.e., surface charge, sCOD, mixed liquor suspended solids (MLSS) and ...

Oct. 13, 2007

By Water Environment Federation (WEF)

A case for aerobic sludge granulation: from pilot to full scale

A pilot-scale sequencing batch reactor (SBR) treating 120 m3/d of a town's wastewater was set up in 2009 and aerobic granules with a mean diameter of 0.28 mm, mixed liquor suspended solids (MLSS) of 7,500 mg/L and sludge volume index (SVI)30 of 43 mL/g were achieved. A full-scale SBR with 50,000 m3/d for treating a town's wastewater was operated in 2010 and aerobic granules ...

Sep. 2, 2015

By IWA Publishing

Strong selection pressures impact the capacity of flocculating activated sludge bacteria to granulate

The capacity of activated sludge (AS) microbial populations to form dense granules offers the potential to establish efficiently settleable biomass. This has the potential to circumvent problems around ineffective solids–liquid separation and sensitivity to variable chemical oxygen demand (COD) loads. Although a number of studies have evaluated aerobic laboratory granulation reactors as ...

Apr. 11, 2013

By IWA Publishing

Primozone solves problem with filamentous sludge - Municipal Case Study

Öresundsverket WWTP has with the installation of the Primozone ozone plant been able to reduce problems with filamentous sludge and at the same time increase capacityon water throughput. At Öresundsverket WWTP in Helsingborg,Sweden, they have problems with filamentous sludge during springtime, as do many other activated sludge plants.With ozonation of the return sludge flow ...

Jul. 13, 2011

By Primozone Production AB

A New View of the Relationship between Filament Content and Activated Sludge Settleability

Abstract This paper provides a critical review and analysis of the commonly accepted relationship between filament content and SVI, and demonstrates that a basic misconception of this relationship, propagated for the last three decades, has been based on an artifact of data presentation. This is appears to be an original hypothesis that corrects what appears to be an error in the commonly ...

Oct. 13, 2007

By Water Environment Federation (WEF)

Optimal design activated sludge process by means of multi-objective optimization: case study in Benchmark Simulation Model 1 (BSM1)

Optimal design of activated sludge process (ASP) using multi-objective optimization was studied, and a benchmark process in Benchmark Simulation Model 1 (BSM1) was taken as a target process. The objectives of the study were to achieve four indexes of percentage of effluent violation (PEV), overall cost index (OCI), total volume and total suspended solids, making up four cases for comparative ...

May 20, 2014

By IWA Publishing

In situ microscopy as a tool for the monitoring of filamentous bacteria: a case study in an industrial activated sludge system dominated by M. parvicella

The present study demonstrates the application of in situ microscopy for monitoring the growth of filamentous bacteria which can induce disturbances in an industrial activated sludge process. An in situ microscope (ISM) is immersed directly into samples of activated sludge with Microthrix parvicella as dominating species. Without needing further preparatory ...

Dec. 1, 2015

By IWA Publishing

Nutrient removal, microbial community and sludge settlement in anaerobic/aerobic sequencing batch reactors without enhanced biological phosphorus removal

Nutrient removal, microbial community and sludge settlement were examined in two 3-litre laboratory-scale anaerobic/aerobic sequencing batch reactors (SBRs). One SBR was operated at 10°C and the other SBR at 20°C. Different from conventional enhanced biological phosphorus removal, most of the soluble sodium acetate was removed in the aerobic phase and no organic carbon uptake or biological ...

May 1, 2010

By IWA Publishing

Performance of aerobic granular sludge at variable circulation rate in anaerobic–aerobic conditions

Aerobic granular sludge (AGS) has been applied to treat a broad range of industrial and municipal wastewater. AGS can be developed in a sequencing batch reactor (SBR) with alternating anaerobic–aerobic conditions. To provide anaerobic conditions, the mixed liquor is allowed to circulate in the reactor without air supply. The circulation flow rate of mixed liquor in anaerobic condition is ...

Jun. 5, 2014

By IWA Publishing

Laboratory Evaluation of Relationships Between Solids Retention Time, Microbial Diversity, and Settling Characteristics of Activated Sludge

ABSTRACT As one of the largest means of achieving pollution control of our waterways, activated sludge is of considerable practical importance. Satisfactory operation of this process, however, has often been hampered by various problems associated with poor settling capability of activated sludge. Despite extensive research, no definitive solutions to these problems exist due to a lack ...

Oct. 13, 2007

By Water Environment Federation (WEF)

Investigating the influence of elongated anaerobic feeding strategy on aerobic sludge granulation and characteristics in sequencing batch reactor

In this research, two sequencing batch reactors (R1 and R2) were operated with different feeding strategies to investigate the effects of elongated anaerobic feeding mode on the granulation process. For this purpose, R1 was operated in a short-feed strategy (5 min) as a reference, whereas an extended anaerobic feeding of 85 min was applied in R2. Results showed that aerobic granules formed in R1 ...

Jul. 23, 2014

By IWA Publishing

Pilot scale evaluation of SANI® process for sludge minimization and greenhouse gas reduction in saline sewage treatment

This study reports on a pilot trial of the SANI® process (Sulfate reduction, Autotrophic denitrification and Nitrification Integrated process) in Hong Kong. A pilot-scale SANI plant treating saline sewage at 10 m3/day was scaled-up from a lab-scale system treating synthetic saline sewage. The plant consisted of a sulfate reduction up-flow sludge bed (SRUSB), an anoxic bioreactor (BAR1) for ...

Jan. 1, 2011

By IWA Publishing

Sludge settleability detection using automated SV30 measurement and its application to a field WWTP

The need for automation & measurement technologies to detect the process state has been a driving force in the development of various measurements at wastewater treatment plants. While the number of applications of automation & measurement technologies to the field is increasing, there have only been a few cases where they have been applied to the area of sludge settling. This is because it is ...

Jan. 1, 2011

By IWA Publishing

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