Using modelling and simulation for the design of full scale ball mill circuits

In last decade the focal point of the activated sludge (AS) modelling shifted from a secondary-treatment to a plant-wide level. This new approach offers more possibilities, therefore demands more effort and expertise from a modeller. This paper presents a plant-wide approach to modelling and simulation of a full-scale AS wastewater treatment plant (WWTP). The construction and routine operational data of the full-scale Central WWTP in Gliwice (Poland) were used in this study to develop an integrated model of the water and sludge lines of the plant. The core of the plant model was the Activated Sludge Model No.1 (ASM1), which combined with sub-models of the other processes, was implemented in the WEST® Software version 3.7.6. The calibration strategy, verification and predictive capacity of the model are discussed. The calibrated model permitted acceptable accuracy of the simulation, yet limited data restrained its scope. Thus, the obtained mathematical description of the plant is a preliminary yet sound basis for a more versatile model. The model limitations and opportunities for its further applications and development are discussed.

Download Full-text

Modelling and Simulation of Variable Speed Thruster Drives with Full-Scale Verification

IFAC Proceedings Volumes ◽

10.1016/s1474-6670(17)37099-4 ◽

2000 ◽

Vol 33 (21) ◽

pp. 347-352

Author(s):

Jan Fredrik Hansen ◽

Trygve Lauvdal ◽

Alf Kåre Ådnanes

Keyword(s):

Full Scale ◽

Modelling And Simulation ◽

Variable Speed

Download Full-text

A new statistical view to modeling of particle residence time distribution in full-scale overflow ball mill operating in closed-circuit

Geosystem Engineering ◽

10.1080/12269328.2017.1392900 ◽

2017 ◽

Vol 21 (4) ◽

pp. 199-209 ◽

Cited By ~ 8

Author(s):

Ahmad Hassanzadeh

Keyword(s):

Residence Time ◽

Ball Mill ◽

Time Distribution ◽

Residence Time Distribution ◽

Full Scale ◽

Closed Circuit ◽

Particle Residence Time

Download Full-text

Minimisation of costs by using disintegration at a full-scale anaerobic digestion plant

Water Science & Technology ◽

10.2166/wst.2002.0637 ◽

2002 ◽

Vol 46 (4-5) ◽

pp. 405-412 ◽

Cited By ~ 11

Author(s):

A. Winter

Keyword(s):

Anaerobic Digestion ◽

Ball Mill ◽

Biogas Production ◽

Waste Water Treatment ◽

Solid Content ◽

Full Scale ◽

Pollution Level ◽

Ball Mills ◽

Capital Costs ◽

Stirred Ball Mill

Various half-scale and lab-scale investigations have already shown that the disintegration of excess sludge is a possible pre-treatment to optimise anaerobic digestion. To control these results different methods of disintegration were investigated at a full-scale plant. Two stirred ball mills and a plant for oxidation with ozone were applied. A positive influence of disintegration on the anaerobic biodegradability can be established with application of a stirred ball mill. Biogas production as well as the degree of degradation were increased by about 20%. Laboratory investigations also validate that disintegration increases the polymer demand and leads to a lower solid content after dewatering. A higher pollution level of process water after dewatering even with ammonia and COD corroborates the results of the anaerobic degradation. Capital costs for the stirred ball mill, costs for energy, manpower and maintenance can be covered if the specific costs for disposal are high. If the development of costs in future and the current discussion about sludge disposal are taken into account sewage sludge disintegration can be a suitable technique to minimise costs at waste water treatment plants.

Download Full-text