Multilevel strategies for the retrofit of large‐scale industrial water system: A brewery case study

Abstract

This article presents an approach to designing a large-scale water system, which integrates water-using operations and wastewater treatment units in different production sections within the same network. This approach uses a mixed-integer nonlinear programming (MINLP) model for water reuse and regeneration reuse in batch and semicontinuous processes. The application of this mathematical formulation to large-scale industrial problems with changing daily production schedule leads to huge and complex mathematical models. Two alternative multilevel strategies are proposed to solve such problems by means of temporal decomposition. The approach is illustrated with a brewery case study that integrates water consumers in two production sections. The results obtained show that, despite the high piping cost, integration of both sections yields better result than the separate water network design in each section. © 2011 American Institute of Chemical Engineers (AIChE)

Bi-objective optimization of a water network via benchmarking

“…The water re-use and regeneration re-use opportunities were analyzed within the production and packaging areas, separately. Data for the case study can be found in Tokos et al (2012).…”

Process Design, Integration and Optimisation: Advantages, Challenges and Drivers

“…It should be pointed out that criteria that are valid for the retrofi t scenario are important, because they generally differ from those for a grassroots design (Jeżowski, 2010). Tokos et al (2012) developed an approach to retrofi t a large-scale brewery water system, which integrates water-using operations and wastewater-treatment units in different production sections within the same network. They used an MINLP model for water reuse and regeneration reuse in batch and semicontinuous processes, proposing two alternative multilevel strategies to solve such problems by means of temporal decomposition.…”

Superstructure-Based Synthesis Framework for a Batch Water Network with Multiple Regeneration Modules

“…Constraint (40) denotes contaminant balance in the module br when a fixed removal ratio for a contaminant is employed to characterize the purification efficiency. However, if a fixed outlet concentration assumption is adopted, constraint (40) will be replaced by constraint (41). The difference between the batch and semicontinuous regeneration modes is that the water purified in the br is only available after a specified processing time, while the water purified in the cr is available for use immediately.…”

“…Because of the natural extension of methodologies for continuous regeneration, single outflow semicontinuous regeneration unit is preferred in many papers, and these contributions considered only one central regeneration unit in the superstructures. − Cheng and Chang initiated an effective formulation to integrate water-using subsystem and wastewater treatment subsystem in batch plants, where batch treatment operations with identical and nonidentical charging and discharging were incorporated. Then, Tokos and co-workers − developed a systematic approach to handle the problem of a single contaminant water network synthesis in a brewery plant based on the work of Kim and Smith, and both batch and semicontinuous regenerators are investigated. In these papers, direct connections exist between water-using units and semicontinuous regenerator without buffer tanks, which assumed that wastewater purified in the semicontinuous regenerator was available for reuse immediately, irrespective of the amount of wastewater.…”