Mercury as an indicator of geological and environmental risks in the development of various mineral raw materials

Mercury is a highly toxic pollutant of the environment, and a quantitative assessment of its emission and migration in the technogenic transformation of mining regions is vital. The presented study focuses on the features of mercury concentration in the natural mineral raw materials, commercial products and processing waste by the example of mercury-containing copper pyrite deposits in the Urals. Mercury (its quantitative indicators) is used as a reliable element-tracer of the evolution of the technogenic system: mineral raw materials – subsurface use wastes – environmental components – food products – the human body. Such integrated approach is recommended for optimizing the forecasting, assessment and management of geological and environmental risks, as well as for the geological and environmental monitoring of the modern mining engineering system.

Analytical hierarchy process in determining the location of the cascara industry in Aceh Tengah District

Choosing the right industry location is an important thing in the business planning process. Cascara industry is one of activity that produces a new product of coffee tree such as a pulp coffee berry. This Industry has the potential to be developed. Processing waste pulp coffee cascara products such as cascara tea is expected to add higher value to pulp coffee. Building the new cascara industry in Aceh Tengah District needs a good strategy to choose the right location for the industry. One method that can be used to analyse this aspect is the method Analytical Hierarchy Process (AHP). Determination of the location of the cascara industry in Aceh Tengah District uses several criteria, namely the potential for cascara production, human resources, transportation access, and infrastructure availability. While the alternative locations chosen for the establishments of the cascara industry are Bebesen Sub district, Kebayakan Sub district, and Pegasing Sub district. According to the result of research, the best alternative location of raw material and infrastructure availability for the establishment of the cascara industry is Pegasing Sub districts with the weight of around 0.399.

Processing tomato waste as a potential bioactive compounds source: phenolic compounds, antioxidant capacity and bioacessibility studies

ABSTRACT: A comparative study was perfomed with conventional and ultrasound assisted extraction on tomato processing waste. Ultrasound extraction exhibited slightly higher phenolic and flavonoids content, as well as higher ABTS + radical scavenging capacity (4.63 mg GAE.g-1, 0.96 mg RUE.g-1 and 27.90 μmol TE.g -1 respectively). On both extracts, a high percentage of flavonoids was lost during simulated digestion, resulting on a bioacessibility of approximately 13 %. Extracts presented good stability during storage conditions, which indicates a possible technological application.

Improved Design of Lifting Slide Rail System of Stone Processing Machine

In this research, improved design for the lifting slide rail system on stone processing machine has innovated in a few aspects, including the innovative design of the lifting rail, fixture to fix and connect with the hydraulic tappet, and the sliding block equipped with limit device etc. The improved design has been successfully applied to the stone processing machine to crush and process block and stone flake processing waste of different shapes, it turned out that the needle flake particle content and crushing index of the processed stone are in line with the national standard requirements, i.e. crushing index of 7.2%, reaching the technical requirements of Class I crushed stone. In another words, the improved design has significantly improved the processing efficiency and safety and reduced costs effectively; meanwhile, its handy operation and utilization has made it ready to promote in a wider range.

IMPLEMENTASI WASTE ASSESMENT MODEL UNTUK MENINGKATKAN OUTPUT PRODUKSI (STUDI KASUS SEWING LINE PT X)

Rendahnya tingkat pencapaian output produksi dapat terjadi karena adanya pemborosan atau waste. Waste ditandai dengan tingginya rework dan reject, serta rendahnya kualitas dan produktivitas kerja. Waste dapat direduksi dengan mengetahui tingkat prosentase waste tertinggi dan terendah, sehingga dapat diketahui jenis waste yang paling mempengaruhi timbulnya jenis waste yang lain. Dengan mengidentifikasi jenis waste yang terjadi diharapkan dapat dicari akar penyebab waste dan solusinya sehingga berdampak pada peningkatan output produksi. Waste Assessment Model (WAM) merupakan metode yang digunakan untuk mengetahui jenis waste yang terjadi pada industri manufaktur. Berdasarkan pendekatan metode WAM pada studi kasus proses penjahitan artikel “01” ditemukan bahwa waste yang paling kritis yaitu waste inappropriate processing. Waste ini diakibatkan oleh tingginya tingkat rework pada bagian kerah dari output yang dihasilkan. Akar penyebab rework pada bagian kerah yaitu tidak adanya alat bantu yang dapat meminimalisir dan memudahkan proses penjahitan kerah. Setelah dilakukan perbaikan tingkat rework menurun yang diikuti dengan meningkatnya output produksi.

Analisis Kadar Merkuri Dalam Rambut Penambang Emas Desa Alue Baro Kecamatan Meukek Secara Spektrofotometri Serapan Atom

The activity of using mercury in gold mining in Alue Baro Village, Meukek District is carried out freely so that it has a negative impact on the environment and the health of the miners. This study aims to determine the level of mercury in the hair of artisanal gold miners in Alue Baro village by referring to the reference that has been set by WHO. The data sample collection was carried out by taking 6 hair samples from the Alue Baro village gold miners who were selected with various types of work, namely gold processing, waste processing and waste waste until the time of the interview with a minimum working period of 1 year with sample codes R1, R2, R3, R4, R5 and R6 as control samples. The six samples were analyzed using Atomic Absorption Spectrophotometry equipped with a Mercury Analyzer which showed results, respectively, 1.01; 2.38; 1.65; 1.35; 1.66; and 0.64 ppm. The results of this study indicate that all hair samples have mercury levels above the mercury threshold that has been set by WHO, namely 1 ppm. High levels of mercury in hair samples were analyzed on exposure to mercury. Further research was conducted to analyze other metals contained in the hair of gold miners in Alue Baro village

Principles of obtaining light permeable conglomerate materials based on wood filler

Recently, the world has seen a demand for transparent or translucent concrete, capable of performing both, structural functions and decorative - design tasks. Such concrete use opens up new opportunities for the creative searches of designers, allows inclusion of new materials in those elements of decorating the internal and external of buildings, structures, large and small architectural forms. The research results on obtaining a new translucent material in the form of wood concrete (arbolite), which makes it possible to introduce previously unused wood processing waste of low-value wood species - birch and aspen into the technological process are presented in the article. The primary results open up new possibilities for light-conducting concretes at significantly low economic costs of their production. The results allows us to conclude about the complexity and ambiguity of wood bleaching processes and the need to strictly follow optimal formulations, modes and compositions at all stages of production.