Efficient CAPE tools for optimising reliability issues of waste management

László Sikosa*, Jiří Klemešb

a Department of Computer Science, FIT, University of Pannonia, Egyetem u. 10, 8200 Veszprém, Hungary
b EC Marie Curie Chair (EXC) “INEMAGLOW”, Research Institute of Chemical and Process Engineering, FIT, University of Pannonia, Egyetem u. 10, 8200 Veszprém, Hungary


Failure data analysis has complex issues to deal with due to the specific characteristics of waste management failures. CAPE tools can be applied to improve Reliability, Availability, Maintainability and Safety (RAMS) analyses. Common problems, such as feeder failures, leakages, waste supply problems, breakdowns, stoppages, overflows, pressure problems, equipment fallouts, require various data to be considered. In addition, scheduled outages need to be taken into account too. The failure rates and mean times required for reliability calculations can be effectively modelled and optimised with a combination of different software groups (specific waste management software, RAMS, statistical software, mathematical packages etc.). However, the corresponding supply and treatment data in waste management is difficult to collect. Furthermore, input data have various sensitivity. Several components and products of treatment processes are complicate to measure, including ashes, burning gases, liquids and waste water, poisons and toxins.

Data collection and data analyses are only a few problems in this field. Waste management systems consist of numerous subsystems, both serial and parallel, with different availabilities and reliabilities. Each subsystem has numerous equipment units. These features should be taken into account as well.
A wide variety of reliability predictions, calculations and simulations need to be performed for complete reliability analyses. RAMS software packages have comprehensive features to support this field, as well as offering various life distributions. The examination of mean time failure characteristics can highlight the weak points of waste management systems from the reliability point of view. Problems occurred frequently can be reduced or eliminated.
Energy efficiency and modern waste treatment methods become more and more important nowadays. The impact on the environment should be decreased to the lowest possible level. The preferred order of waste treatment, i.e. avoidance, reduction, reuse, recycling, recovery, should be applied. However, they are not feasible everywhere. The various optimality constraints are capable to define a rather cheap and economic solution while performing complete reliability analyses with software support.

Even waste management systems with high reliability can be improved towards the desired level of reliability, however, it is not easy to determine that level due to the numerous aspects to be considered and especially the additional costs. Reliability predictions and calculations performed with the combination of software packages is a CAPE approach that capable to set the right balance of availability, reliability, operation and maintenance costs in waste management reliability engineering.

CAPE Forum, Limerick, Ireland, 2009


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