in this research degradation and mineralization of ortho-toluidine (ot) in the wastewater of petrochemical industries was investigated by uv/tio 2 process in a batch recirculating photo reactor. the influence of different variables such as initial ph, amount of tio 2 and initial concentration of ot on the reaction rate was investigated. in optimum conditions (1.75 g/l of catalyst, ph at 7 and i...

• A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website. • The final author version ...

The detection of abnormal events in advance is still a challenge in chemical industries. The earlier it is done, the greater the possibility of at least mitigating losses. This study investigates the performance of a signal processing tool so-called hidden Markov model (HMM) in accomplishing detection tasks. The case study is based on a chemical recovery boiler that belongs to a Kraft pulping m...

The design of a process plant is a daunting task. Numerous sensors and actuators need to be installed and connected, cables must be laid and cabinets wired. The instrumentation within the plant is specified and designed by different teams. Highly complex documentation is required to keep track of all this. It is essential that such documentation is updated as modifications are made during the l...

Abstract:The operation of modern day process plant cannot be visualized without the smart looking Distributed Control System (DCS) situated in control rooms. Process plant automation has evolved from pneumatics to electronics’ to DCS. Use of DCS leads to various advantages like the overall optimization, ease of operation and maintenance tasks, easy monitoring of more plant parameters and ensure...

We consider the planning and scheduling of production in a multitask/multistage batch manufacturing process typical of industries such as chemical manufacturing, food processing, and oil refining. We allow instances in which multiple sequences of tasks may be used to produce end products. We formulate the problem as a mixed-integer linear program and show that the linear programming relaxation ...

We discuss three emerging technologies for process enterprise optimization, using a different application domain as an example in each case. The first topic is cross-functional integration on a model predictive control (MPC) foundation, in which a coordination layer is added to dynamically integrate unit-level MPCs. Enterprise optimization for oil refining is used to illustrate the concept. We ...

The overall purpose of this research is to map the maintenance management in three companies in the process industry sector and to analyse whether these companies apply a holistic perspective on their maintenance management. We have mapped our cases using the framework developed by Crespo Márquez et al. (2009) and our results show that even though maintenance is of utmost importance in the proc...

We consider a competitive version of the traditional aggregate production planning model with capacity constraints. In the general case, multiple products are produced by a few competing producers (oligopoly) with limited capacities. Production quantities, prices and consequently profits depend on production and allocation decisions of each producer. In addition, there is competition for the ra...

The objective of this research is to study the effect of tapioca starch wastewater industries as substrate on an anaerobic fixed bed digester to the biogas production and to study the performance of 2.25 m fixed bed digester. The research was conducted from February-November 2000 in Situraja, Sumedang, West-Java the benefit of this research is to obtain environmentally sound technologiest in th...