Optimization of Maintenance Management Indicators in a Chilled Water Plant

The academic sector, like any other service or industrial sector, requires constant innovation in each of its processes. In Colombia, the Universidad EAFIT, as part of the search for new ways of teaching and learning, has recognized the significance of making learning spaces suitable for the people involved in this process. In consequence, the project described in this chapter shows the most efficient methodology for the optimization of asset management for the Universidad EAFIT's Ice Water Plant. The methodologies used include key concepts and factors such as availability, maintainability, and reliability in the costs related to the behavior and nature of the failures, having as reference an integral model of the maintenance management process. The objective of this project is to maintain these high standards of operation and maintenance throughout the useful life of the system and to show the importance that maintenance and the methodologies associated with it have in any sector or industry.

Studies on Lectin Mediated Agglutination Reaction on Red Blood Cell Surface Antigens Using Hot and Cold Water Plant Extracts

Lectin has various physiological roles in cell agglutination, based on their carbohydrate-binding properties, plant lectins are widely used for the detection, segregation, and characterization of glycoconjugates. Rhesus (Rh) factor is a protein that is inherited and found on the surface of red blood cells. If the surface protein is present, the RBC is Rh positive; otherwise, it is Rh-negative in nature. In this paper, we use agglutination reactions to investigate the effect of different cold and hot water extracted plants on RBC antigens as an alternative to commercial monoclonal antibodies. Extensive research on the sequence homology and 3-D structure of various plant lectins suggests that they have been conserved throughout evolution and may play important physiological roles that are still unknown.

THE GECHEPSIN FORTIFIED SETTLEMENT: EXPERIENCE OF COMPREHENSIVE EXCAVATIONS

Несмотря на очевидный прогресс в наших представлениях о системе расселения восточной периферии азиатского Боспора, круг известных памятников совсем невелик, а об их хронологии можно судить только на основании подъемного материала. Комплексные исследования на городище Гечепсин позволили выявить два строительных горизонта, датируемых керамическими материалами в пределах II в. до н. э. - II в. н. э. и охарактеризовать особенности топографии (фортификацию, коммуникации и т. п.). Исследованная кладка сооружения фортификационной системы крепости была сооружена на культурном слое эпохи позднего эллинизма и просуществовала не более века. Выявленные на площадке городища постройки возведены, судя по всему, в античных традициях сырцово-каменной архитектуры. В конце I тыс. до н. э. - нач. I тыс. н. э. в районе городища, согласно спорово-пыльцевому анализу, были широко распространены степные злаково-разнотравные растительные сообщества. Присутствие пыльцы водных растений в верхней части профиля отражает, вероятнее всего, использование речной глины для возведения сырцовых конструкций. Despite obvious progress in developing our concepts on the settlement system in the eastern periphery of Asian Bosporus, the group of the known sites is not that large, while their chronology can be determined only with the use of surface finds. Comprehensive excavations at the Gechepsin fortified settlement made it possible to identify two construction horizons dated by ceramic finds to 2 century BC -2 century AD and characterize specifics of topography (fortification, communications, etc.). The examined masonry of the fortress fortification construction was built in the occupation layer of the Late Hellenic period and did not function more than half a century. Constructions identified at the fortified settlement were, most likely, built in Ancient Greek traditions of adobe-stone architecture. At the end of I mill. BC - early I mill. AD steppe gramineous-mixed grass plant associations were widespread in the area around the settlement as evidenced by pollen analysis. Presence of water plant pollen in the upper part of the profile, most likely, reflects use of river clay for building adobe constructions.

Flow hydraulic simulation through two sand traps, using Ansys fluent

Computational fluid dynamics is a tool that allows to simulate and observe the behavior of any fluid, based on a physical, hydraulic, and hydrodynamic analysis. This research analyses the behavior of the flow in a sand trap, which is a structure used to remove sand particles with a minimum size of 0.10 mm, prior to treatment in a drinking-water plant. The objective of this study is to determine the highest efficiency between two sand traps, one with a double smooth screen and the other with a double perforated screen (with diffusers), based on the simulation and analysis behavior of the flow inside each sand trap. The methodology used includes the traditional design of each unit based on Hazen’s model and Stokes viscosity law, to later carry out the numerical model simulation from Ansys Fluent (pre-processing, processing, and post-processing). The result shows that perforated double screen sand trap generates a removal efficiency of 78%, while the smooth double screen 28%. In addition, other four units of interleaved screens are proposed, in these cases efficiencies of up to 50% are observed and it is shown that it is necessary to implement at least two perforated screens (with diffusers) to guarantee an efficiency greater than 70%. Hydraulic simulation has a broad impact on infrastructure works and consulting.

Game Analysis on Profits of Water Diversion Project Supply Chain Under the Overall Loss of Supply Chain in Undeveloped Areas

This paper compares and analyzes the effects of different amounts of government subsidies and subsidy patterns on water supply, pricing, and profit distribution, and takes water diversion project supply chain composed of water transfer company and the water work as the study object, using financial accounting method innovatively, establishing non-cooperative and cooperative game models of two under government subsidies. The results show that as the number of subsidies increased, the optimal amount of water supply and the profits increased, but the price of water work decreased. When the amount of subsidy stays same, the price of water plant also stays same. However, the price of the water transfer company is constantly changing, the higher the proportion of subsidies it received, the lower the price. In terms of data, the authors take a practical example – the Tao River Water Diversion Project to analyze. This paper’s limitation is that the conclusion is based on a single water transfer company and a single water plant as the research object. However, the actual situation of the water transfer project is that a water transfer company faces a complex supply chain network formed by many water plants and farmers’ water users’ associations.

Preferensi Habitat Ikan Gabus [Channa striata (Bloch 1793)] di Perairan Rawa Aopa, Sulawesi Tenggara

The use of habitat by fish is closely related to efforts to find the best conditions for the survival of these fish. This study aims to analyze the habitat preferences of Striped snakehead in Rawa Aopa waters, Southeast Sulawesi. This research was conducted from November 2018 to February 2019 in the waters of Swamp Aopa Southeast Sulawesi. Fish collection using traps. The constancy and fidelity index determined the preference of striped snakehead for habitat type. A total of 1024 striped snakehead fish were caught during the study with a length range of 200,0-420,0 mm and 69,0-596,0 g weight. Striped snakehead measuring 200-367 mm were consistent in occupying habitats with a slightly dense to dense water plant density, while sizes 368-388 and 389-430 mm were consistent in habitats with sparse water plant density. The preference level of striped snakehead fish size 389-430 mm to habitats with rare aquatic plants is very high (Fij = 6). Therefore, the size can be used as an indicator of habitats with the rare aquatic plant category. The preference for 200-367 mm striped snakehead fish in dense aquatic plant habitats indicates that these habitats are foraging, growing, and protective zones. Keywords: Channa striata, fish habitat, Rawa Aopa, Southeast Sulawesi, stripe snakehead

Reclamation of Cobalt and Copper from Single- and Co-contaminated Wastewater via Carbonate and Hydroxide Precipitation

Wastewater containing cobalt and copper comprised of plating wash water, plant wash water, and equipment cooling and wash water is generated in the electroplating industry. These metals can be detrimental to humans, animals, plants, and the environment. Thus, it is necessary to treat electroplating wastewater to remove these toxic metals. Carbonate and hydroxide precipitation were utilized for the removal of Co(II) and Cu(II) from synthetic electroplating wastewater by jar tests in this work. The effects of solution pH, precipitant-to-metal ratio, and type of precipitant on the precipitation efficiency of cobalt and copper from the single- and co-contaminated systems were investigated. Carbonate precipitation achieved higher removal efficiency for both target metals in the single- and co-contaminated wastewater streams. Furthermore, it can operate at relatively low pH range of about 7.0-8.0. Cobalt in both pollutant systems was almost completely removed at pH 10.0 using both precipitant systems. Copper was found to be easily removed which was possibly brought about by precipitation-adsorption mechanism. The extent of the co-removal of cobalt with copper is significantly pH dependent. The effect of precipitant-to-metal ratio for cobalt and copper treatment varied in single- and co-contaminated streams. Carbonate precipitation led to lower sludge density than that of hydroxide precipitation.