sludge volume index Articles | Environmental XPRT

Lumpur Aktif (Activated Sludge)

Lumpur aktif (activated sludge) merupakan campuran cair atau semicair dan partikel endapan lumpur dan tanah liat salah satu proses pengolahan air limbah secara biologi, proses pertumbuhan organisme yang berukuran sangat kecil yang biasa disebut mikroba tersuspensi dimana proses tersebut pada dasarnya merupakan pengolahan aerobik yang mengoksidasi material organik menjadi CO2 dan H2O, NH4. dan sel ...

Jul. 11, 2018

By Grinviro Biotekno Indonesia

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

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 ...

Jul. 23, 2014

By IWA Publishing

Predicting Unpredictable, Controlling Uncontrollable

Selection of activated sludge process parameters that provide required sludge settling and effluent quality at the lowest operating cost is a challenging task. There are no mechanistic models that can be used for predicting sludge settling, and until now there were no reliable methods that can help to quantify process parameters under which the desired sludge settling is achieved. Since sludge ...

May 7, 2007

By Water Environment Federation (WEF)

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

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 with a mean MLSS ...

Sep. 2, 2015

By IWA Publishing

Development of Final Sedimentation Tank Maximum Operating Capacity Curves Using Vesilind Settling Parameters and Mathematical Modeling

New advances in development of maximum operating capacity curves using final sedimentation tank (FST) computational fluid dynamic (CFD) package – High Accuracy Clarifier Model (HACM©) and Vesilind settling parameters (Vo and k) were successfully applied in a recent project at the Sai Kung Sewage Treatment Works of the Drainage Services Department (DSD) in Hong Kong. The advances consist of more ...

Oct. 21, 2006

By Water Environment Federation (WEF)

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

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

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

Improvement of the intersection method for the quantification of filamentous organisms: basis and practice for bulking and foaming bioindication purposes

Bulking and foaming phenomena in activated sludge wastewater treatment plants are in most cases related to the abundance of filamentous microorganisms. Quantifying these microorganisms should be a preliminary stage in their control. In this paper, the simplicity of quantifying them based on the intersection method is demonstrated, by redescribing the theory and applying a new improved ...

Jun. 20, 2016

By IWA Publishing

Research on the microbial characters of mixture in an integrated A/O membrane bioreactor

An integrated anaerobe/aerobic membrane bioreactor (A/O MBR) was built and used to treat urban sewage water. The characters of mixture was researched and analyzed. Because the concentration of active sludge in MBR is high, the load of the sludge during the function is really low. When the active sludge functioned under low load condition, because of the low concentration of nutrition the ...

Apr. 9, 2012

By IWA Publishing

Granulation of biological flocs under elevated pressure: characteristics of granules

Aerobic granules (AG) have good settling ability and are relatively insensitive to the variation of organic loading rate. When sizes of granules become bigger, substrate and oxygen become limited in the granule core, leading to cell lysis and disintegration of granules. The higher the dissolved oxygen, the deeper the oxygen penetration inside AG. AG operated under elevated pressure might be a ...

Jun. 21, 2013

By IWA Publishing

Greywater treatment in an aerobic SBR: sludge structure and kinetics

In order to have an efficient operation, sequencing batch reactors (SBR) must support granular biomass with high conversion rates, settling properties, and be able to deal with the inherent variability of the composition of real wastewaters. In this study, the effect of the influent composition and the specific organic loading rate (Bx) on the granulation process was evaluated in two SBRs, ...

Jun. 12, 2017

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)

Effect of Anoxic Selector Configuration on SVI Control and Bacterial Population Fingerprinting

ABSTRACT Anoxic selectors are used in activated sludge systems prior to the aerobic zone to favor floc-forming bacteria growth over filamentous bacteria, which cause poor settling characteristics. However, anoxic selector may not successfully limit the growth of all filamentous organisms, including Microthrix parvicella, Type 0041, Nostocoida limicola II, and Type 1851. Anoxic selectors are ...

Oct. 13, 2007

By Water Environment Federation (WEF)

Comparison of saline wastewater treatment performance of SBR with repeated starvation under aerobic and non-aerobic conditions

This study investigated the effects of repeated starvation and feeding on the performance of a sequencing batch reactor (SBR) used for treating saline wastewater. The effects of aerobic and non-aerobic conditions on the sludge during starvation were evaluated to recover the performance of the SBR in terms of floc size and pollutant removal after resuming wastewater feeding. The floc size, fractal ...

Mar. 1, 2011

By IWA Publishing

Performance of diatomite/iron oxide modified nonwoven membrane used in membrane bioreactor process for wastewater reclamation

This study describes an approach for surface modification of a nonwoven membrane by diatomite/iron oxide to examine its filterability. Analysis results showed that nonwoven hydrophilicity is enhanced. Static contact angle decreases dramatically from 122.66° to 39.33°. Scanning electron micrograph images show that diatomite/iron oxide is attached on nonwoven fiber. X-ray ...

Aug. 7, 2014

By IWA Publishing

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 ...

Jan. 16, 2014

By IWA Publishing

Control of Microthrix parvicella by aluminium salts addition

Aluminium and iron chloride were added to a biological nutrient removal pilot plant (1,500 population equivalent) treating urban wastewater to investigate the control of Microthrix parvicella bulking and foaming by metallic salts. Monitoring plant performance over two 6-month periods showed a slight impact on the removal efficiencies. Addition of metallic salts (Me; aluminium or aluminium + ...

Oct. 1, 2015

By IWA Publishing