Development and Optimization of a Process Combination of a Highest-Loaded Activated Sludge Stage and Biologically Intensified Filtration

1987 ◽  
Vol 19 (5-6) ◽  
pp. 981-992 ◽  
Author(s):  
W. Firk ◽  
N. Ghandehari
Keyword(s):  
Activated Sludge ◽  
Oxygen Supply ◽  
Substantial Improvement ◽  
Supply System ◽  
Advanced Treatment ◽  
Activated Sludge Process ◽  
Process Modification ◽  
Effluent Standards ◽  
Process Combination ◽  
Activated Sludge Systems

Conventional sand- and two-layer filtration is frequently put into action for the purpose of advanced wastewater treatment after low-loaded activated sludge systems. However, the effectiveness of this conventional filter concerning the biological content which is difficult to degrade (measured by COD) is extremely low - and the costs too high. In direct comparison, modifying the filters to a biologically intensified system, brings about a substantial increase in efficiency while costing very little more. The investigations of the authors for the optimization of the whole system, consisting of an activated sludge process and a biologically intensified filter, led to the fact that for the requirements of advanced treatment, the size of the activated sludge stage can be substantially reduced, without the effectiveness of the system as a whole being affected. In the field of normal requirements (national effluent standards) and comparable low influx concentrations, biologically intensified filtration can be combined with a high-loaded activated sludge process of SLR up to 5 kg BOD5/(kg MLSS.d). The area required for the construction of the system is under 50% compared to the conventional one-stage activated sludge system. At higher influx concentrations the simultaneous addition of precipitants/flocculants to the high-loaded activated sludge stage, leads to substantial improvement of the effluent of the whole system and simultaneously to a distinct phosphorus elimination. This process modification is greatly advantageous, especially for densely populated lake areas. The oxygen supply system of the filter has a key function in connection with the influent concentration and the loading of the biological stage.

New approaches to minimize excess sludge in activated sludge systems

2001 ◽  
Vol 44 (10) ◽  
pp. 203-208 ◽  
Author(s):  
G.-H. Chen ◽  
S. Saby ◽  
M. Djafer ◽  
H.-K. Mo
Keyword(s):  
Activated Sludge ◽  
Activated Sludge Process ◽  
Conventional System ◽  
Excess Sludge ◽  
Active Sludge ◽  
New Approaches ◽  
Conventional Activated Sludge ◽  
Sludge Settleability ◽  
Activated Sludge Systems ◽  
Sludge Production

This paper presents three new approaches to reduce excess sludge production in activated sludge systems: 1) modification of conventional activated sludge process with insertion of a sludge holding tank in the sludge return line; 2) chlorination of excess sludge so as to minimize excess sludge production; and 3) utilization of a metabolic uncoupler, 3, 3′, 4′, 5-Tetrachlorosalicylanilide (TCS) to maximize futile activity of sludge microorganisms thereby leading to a reduction of sludge growth. Pilot study was carried out to evaluate this modified activated sludge process (OSA). It has been confirmed that the OSA process is effective in reducing excess sludge; particularly when the ORP level in the sludge holding tank was kept at -250 mV, more than 50% of the excess sludge was reduced. This process can maintain the effluent quality and even perform with a better sludge settleability than a conventional system. Experimental work on the second approach showed that chlorination treatment of excess sludge at a chlorine dose of 0.066 g Cl2/g MLSS reduced the excess sludge by 60%, while concentration of THMS was found below 200 ppb in the treated sludge. However, such sludge chlorination treatment sacrificed sludge settleability. Thus, it is not feasible to introduce the chlorination step to a conventional system. The third approach confirmed that addition of TCS could reduce sludge growth effectively if the TCS concentration is greater than 0.4 ppm. A 0.8-ppm concentration of TCS actually reduced excess sludge by 45%. It was also experimentally demonstrated that presence of TCS increases the portion of active sludge microorganisms over the entire microbial population.

Activated Sludge Process Modification Study

1979 ◽  
Vol 105 (2) ◽  
pp. 189-198
Author(s):  
Hraj A. Khararjian ◽  
Joseph H. Sherrard
Keyword(s):  
Activated Sludge ◽  
Activated Sludge Process ◽  
Process Modification

Stabilization of Activated Sludge Processes During Wet Weather Flow through Microscreening

1994 ◽  
Vol 29 (1-2) ◽  
pp. 393-399
Author(s):  
K.-D. Kummer ◽  
W. F. Geiger
Keyword(s):  
Activated Sludge ◽  
Suspended Solids ◽  
Aeration Tank ◽  
Activated Sludge Process ◽  
Treatment Facility ◽  
Process Modification ◽  
Flow Through ◽  
Wet Weather ◽  
Wet Weather Flow ◽  
Activated Sludge Processes

In the activated sludge process, between the aeration tank and the final clarifier, offline microscreening is introduced to separate activated sludge and purified water. The intention is to reduce the drifting of activated sludge from the aeration tank into the final clarifier. Sludge drifting usually occurs during wet weather flow loading of the treatment facility and can cause higher concentrations of ammonia and suspended solids in the effluent. Laboratory and half-technical scale experiments demonstrate that microscreening is suitable for this application. It is expected that the operational stability of activated sludge processes could be improved significantly by this process modification.

Respirometry in control of the activated sludge process

1996 ◽  
Vol 34 (3-4) ◽  
pp. 117-126 ◽  
Author(s):  
Henri Spanjers ◽  
Peter Vanrolleghem ◽  
Gustaf Olsson ◽  
Peter Dold
Keyword(s):  
Activated Sludge ◽  
Respiration Rate ◽  
Control Strategies ◽  
Task Group ◽  
Activated Sludge Process ◽  
Respiration Rates ◽  
Technical Report ◽  
Activated Sludge Systems

This paper summarises progress of the IAWQ Task Group developing the Scientific and Technical Report (STR) on respirometry in control of the activated sludge process. The significance of respirometry in activated sludge systems is explained from a biochemical background. A classification is proposed which includes all respirometric measuring principles described in the literature. The different respiration rates that can be measured are reviewed and some variables that can be deduced from respiration rate are discussed. Some elementary control concepts will be provided that are necessary for the evaluation of respirometry-based control strategies. Finally, a number of respirometry-based control strategies will be classified and discussed.

scholarly journals OPTIMALISASI IPAL GEDUNG ARIOBIMO DENGAN MODIFIKASI PROSES LUMPUR AKTIF DAN BIOFILTER

2018 ◽  
Vol 7 (1) ◽  
Author(s):  
Setiyono Setiyono
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Treatment Plant ◽  
Domestic Wastewater ◽  
Quality Standards ◽  
Activated Sludge Process ◽  
Treatment Technology ◽  
Process Modification ◽  
Domestic Wastewater Treatment

Ariobimo building, now has a domestic wastewater treatment plant which is equipped with the system re-use. At first, the process of wastewater treatment technology using activated sludge process, while the system re-use of wastewater using a combination of chemical-physical processes, namely the process of coagulation-flocculation followed by sedimentation, filtration and adsorption last with. Because this process is not optimal, then this WWTP outlet and the quality of its water re-use can not meet the expected quality standards. After the improvement of the existing activated sludge process, the quality of this WWTP outlet can meet the quality standards of waste discharges. While the process of coagulation-flocculation is replaced with biofilter process using  honey comb tube media, the quality of the effluent can meet water quality standards. Keywords :Domestic wastewater,process modification,  water reused. 

An Innovative Technology for Upgrading Nutrient Removal Activated Sludge Plants

1990 ◽  
Vol 22 (7-8) ◽  
pp. 9-20 ◽  
Author(s):  
Jiří Wanner ◽  
Miroslav Kos ◽  
Petr Grau
Keyword(s):  
Activated Sludge ◽  
Nutrient Removal ◽  
Treatment Plant ◽  
Innovative Technology ◽  
Activated Sludge Process ◽  
High Nitrogen ◽  
Anoxic Zone ◽  
Characteristic Features ◽  
The Town ◽  
Activated Sludge Systems

A brief survey of activated sludge systems for nutrient removal from wastewaters iss given and their characteristic features are discussed. Four modifications of the nutrient removal activated sludge process were tested in pilot-plant units with a wastewater from the town of Pilsen. The re-aeration of the returned sludge proved to be advantageous for achieving high nitrogen removal. For the design of a new wastewater treatment plant for the town of Pilsen, the activated sludge process, consisting of the anaerobic-anoxic-oxic sequence with the reaeration of the returned sludge, was used. The newly designed technological line of the so-called R-AN-D-N Process is very flexible thanks to the wastewater inlet in both the anaerobic and the anoxic zone and to the possibility of introducing the internal recycle in either the anoxic or the anaerobic zone.

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