Floc agglomeration and structuration by a specific talc mineral composition

1997 ◽  
Vol 36 (4) ◽  
pp. 57-68 ◽  
Author(s):  
A. Bidault ◽  
F. Clauss ◽  
D. Helaine ◽  
C. Balavoine
Keyword(s):  
Waste Water ◽  
Water Treatment ◽  
Activated Sludge ◽  
Waste Water Treatment ◽  
Research Work ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Waste Water Treatment Plant ◽  
Aeration Tank ◽  
Flocculation Efficiency

The quality of the effluent from a waste water treatment plant using the activated sludge process depends upon the bacteria flocculation efficiency. Intensive research work has been devoted to understanding flocculation phenomena and to correct disorders. The addition of very fine but dense talc particles to the aeration tank immediately improves floc formation and densifies the new flocs created. In the longer term, the fine talc particles improve floc structuration and form stable and strong flocs. This has been demonstrated by running a modified activated sludge through the high shear strength of pumps and hydrocyclones. These fine talc particles offer a solution to solve floc settleability problems which so frequently arise when biological disorders appear in waste water treatment plants. Two practical cases are presented.

Experiences with the World’s Largest Municipal Waste Water Treatment Plant Using Membrane Technology

2006 ◽  
Vol 1 (4) ◽  
Author(s):  
N. Engelhardt ◽  
W. Lindner
Keyword(s):  
Waste Water ◽  
Water Treatment ◽  
Activated Sludge ◽  
Membrane Filtration ◽  
Anthropogenic Impacts ◽  
Waste Water Treatment ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Waste Water Treatment Plant ◽  
Economic Point

With the commissioning of the waste water treatment plant Nordkanal, which has been dimensioned for a design capacity of 80,000 population equivalents, new worldwide standards for the implementation of large membrane-activated sludge plants have been created both from a technical and from an economic point of view. The hitherto successful operation of this plant has already now contributed towards this technology becoming suitable for use in large waste water treatment plants. The now two years the waste water treatment plant Nordkanal has been in operation have once again demonstrated that even on a large scale, membrane-activated sludge plants are able to reliably produce purified effluent of excellent quality, while simultaneously providing a small-sized design. They prove advantageous everywhere small-sized designs are sought after and the purified effluent has to meet high or special requirements. Wherever purification requirements are intensified in the foreseeable future, whether with regard to the hygienisation of effluent, or in the framework of re-using purified waste water as industrial water or potable water or in order to protect natural drinking water resources from critical anthropogenic impacts, the membrane bioreactor process or membrane filtration is trend setting and will increasingly gain in importance.

Enhancement of Capacity and Efficiency of a Biological Waste Water Treatment Plant

1999 ◽  
Vol 40 (11-12) ◽  
pp. 231-239 ◽  
Author(s):  
Nikolaus Kaindl ◽  
Ulf Tillman ◽  
Christian H. Möbius
Keyword(s):  
Waste Water ◽  
Water Treatment ◽  
Activated Sludge ◽  
Water Flow ◽  
Waste Water Treatment ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Waste Water Treatment Plant ◽  
Cod Reduction ◽  
Reduction Capacity

The capacity and efficiency of the existing activated sludge waste water treatment plant at SCA Graphic Laakirchen AG needs to be enhanced due to an expected future increase in waste water flow and COD-load. For the case of an existing upper limit of COD discharges into the river, the COD reduction rate of the waste water treatment has to be increased to a degree which is unobtainable by biodegradation only. Laboratory and pilot plant trials using a moving bed biofilm technique and an activated sludge treatment combined with ozone treatment and subsequent biofiltration have been performed with the aim to increase the COD reduction capacity and efficiency of the plant. The results show that the COD reduction capacity of the existing activated sludge plant can be increased by more than 100% by integrating a moving bed biofilm pre-treatment stage into the plant. In addition, improved sludge separation in the secondary clarifier was established. A special benefit of the ozonation plus biofilter treatment is a controllable COD reduction between 20 - 90% related to the outflow of the activated sludge plant. It is concluded that by integrating the investigated treatment techniques in the existing activated sludge plant the future increases in waste water flow and COD-Load can be handled satisfactorily without increasing bioreactor volume.

Adaption of the main waste water treatment plant in Vienna to meet Austrian emission regulations

1996 ◽  
Vol 33 (12) ◽  
pp. 65-72
Author(s):  
Harald Kainz ◽  
Herbert Hofstetter
Keyword(s):  
Waste Water ◽  
Water Treatment ◽  
Waste Water Treatment ◽  
Treatment Plant ◽  
Optimal Solution ◽  
Evaluation Process ◽  
Water Treatment Plant ◽  
Waste Water Treatment Plant ◽  
Aeration Tank ◽  
Emission Regulations

The modification of the main waste water treatment plant in Vienna will take place in accordance with the minimum efficiences laid down in the emission regulations as issued in 1991 by the Austrian Federal Office for Agriculture and Forestry. To meet these figures it is necessary to adapt the plant by 2001. The studies on several variants and the evaluation process showed a 2-step technology with partial by-passing of the 1st step to be the optimal solution. For this flexible system a new aeration tank volume of only 210,000 m3 is sufficient. Test-runs with a semi-commercial plant confirmed the correctness of all calculations. Possibilities for further modifications have been considered, e.g. dimensioning of all relevant hydraulic installations up to 24 m3/sec, final purification by sand or flocculant filtration and spare areas for measures after 2015.

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