Systematization of the Mineral Raw Material Waste Recycling Process

The paper considers a system for optimizing the recycling process of mineral raw material waste in terms of the target function, which takes into account economic, technological, and environmental criteria. We have suggested a structural model of the production process of mineral raw material recycling using cost flows. Based on the analysis of this model, we concluded on the need to develop new methods for assessing and choosing the parameters of the equipment used, including specific performance criteria to assess the degree of sophistication of the systems under study.

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Potential Utilization of Sewage Sludge from Water Treatment Plant as Brick Material

E3S Web of Conferences ◽

10.1051/e3sconf/20187305001 ◽

2018 ◽

Vol 73 ◽

pp. 05001

Author(s):

Budi Prasetyo Samadikun ◽

Siti Rukayah ◽

Ika Bagus Priyambada ◽

Sry T. Romaito Lumbantobing ◽

Mochamad Arief Budihardjo

Keyword(s):

Water Treatment ◽

Treatment Plant ◽

Water Treatment Plant ◽

Waste Recycling ◽

Raw Material ◽

Recycling Process ◽

Economic Problems ◽

Water Treatment Process ◽

Research Findings ◽

Sludge Waste

One of the results of the water treatment process is the sludge. Generally, the processed sludge from the water treatment is collected and delivered to a landfil. With the delivery of sludge waste, it requires additional cost as a levy in handling sludge waste. Therefore, it is needed to innovate on the recycling of sludge. The waste recycling process is expected to minimize the residual impact of the Water Treatment Plant. The process of waste recycling can be done by utilizing sludge from water treatment, which is brick making process. The benefits can eliminate environmental problems and also some economic problems. This study aims to determine the potential of sludge from water treatment plant to be added for brick making by investigating the physical and characteristics of sludge. The research findings show that sludge waste has the potential to become a brick raw material depending on the nature and clay microstructure

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Is Recycling Always the Best Option? Environmental Assessment of Recycling of Seashell as Aggregates in Noise Barriers

Processes ◽

10.3390/pr8070776 ◽

2020 ◽

Vol 8 (7) ◽

pp. 776

Author(s):

Begoña Peceño ◽

Carlos Leiva ◽

Bernabé Alonso-Fariñas ◽

Alejandro Gallego-Schmid

Keyword(s):

Life Cycle ◽

Environmental Impacts ◽

Waste Recycling ◽

Point Of View ◽

Raw Material ◽

Recycling Process ◽

Noise Barriers ◽

Noise Barrier ◽

Pre Treatment ◽

Natural Aggregates

Waste recycling is an essential part of waste management. The concrete industry allows the use of large quantities of waste as a substitute for a conventional raw material without sacrificing the technical properties of the product. From a circular economy point of view, this is an excellent opportunity for waste recycling. Nevertheless, in some cases, the recycling process can be undesirable because it does not involve a net saving in resource consumption or other environmental impacts when compared to the conventional production process. In this study, the environmental performance of conventional absorption porous barriers, composed of 86 wt % of natural aggregates and 14 wt % cement, was compared with barriers composed of 80 wt % seashell waste and 20 wt % cement through an attributional cradle-to-grave life cycle assessment. The results show that, for the 11 environmental impact categories considered, the substitution of the natural aggregates with seashell waste involves higher environmental impacts, between 32% and 267%. These results are justified by the high contribution to these impacts of the seashell waste pre-treatment and the higher cement consumption. Therefore, the recycling of seashells in noise barrier manufacturing is not justified from an environmental standpoint with the current conditions. In this sense, it could be concluded that life cycle assessments should be carried out simultaneously with the technical development of the recycling process to ensure a sustainable solution.

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Effect of log loading on the performance of wood room

Nordic Pulp & Paper Research Journal ◽

10.3183/npprj-2014-29-02-p201-210 ◽

2014 ◽

Vol 29 (2) ◽

pp. 201-210

Author(s):

Ari Isokangas ◽

Kari Ala-Kaila ◽

Markku Ohenoja ◽

Aki Sorsa ◽

Kauko Leiviskä

Keyword(s):

Product Quality ◽

Material Properties ◽

Raw Material ◽

Performance Criteria ◽

Processing Unit ◽

Level Control ◽

Paper Mills ◽

Remarkable Effect ◽

Loading Process ◽

Small Wood

Abstract The purpose of this paper is to analyse the log loading process of wood room, which is typically the first processing unit in pulp and paper mills. The aim is to improve the log loading process to obtain production with a constant log flow of well de-iced logs to the debarking drum. This way it is possible to reduce costs and enhance product quality. The research was carried out utilising a log loading simulator. The parameters of the simulation model were selected on the basis of process observations on a mill. The results indicate that it is essential to adjust the process and equipment parameters, raw material properties and truck loader operation together in order to reach the target capacity with minimum costs. Especially the speed of the infeed conveyor affects all performance criteria and should be selected carefully. In addition, wood yard logistics and raw material properties have a remarkable effect on the wood room performance. The results can be utilised in mills to allow the upper level control perform in a planned way so that small wood loss and good product quality can be obtained.

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Treating and reusing wastewater generated by the washing operations in the non-hazardous plastic solid waste recycling process: Advanced method vs. conventional method

Journal of Environmental Management ◽

10.1016/j.jenvman.2021.112011 ◽

2021 ◽

Vol 284 ◽

pp. 112011

Author(s):

Valerio Guido Altieri ◽

Marco De Sanctis ◽

Damiano Sgherza ◽

Simona Pentassuglia ◽

Emanuele Barca ◽

...

Keyword(s):

Solid Waste ◽

Conventional Method ◽

Waste Recycling ◽

Recycling Process ◽

Advanced Method ◽

Solid Waste Recycling

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Present status of the world and russian uranium mineral-raw material resources

Atomic Energy ◽

10.1007/s10512-010-9230-2 ◽

2009 ◽

Vol 107 (5) ◽

pp. 310-316 ◽

Cited By ~ 2

Author(s):

V. V. Shatalov ◽

A. V. Tarkhanov

Keyword(s):

Present Status ◽

Raw Material ◽

Uranium Mineral ◽

Mineral Raw Material ◽

Material Resources ◽

The World

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Environmental assessment of construction and demolition waste recycling in Bolivia: Focus on transportation distances and selective collection rates

Waste Management & Research ◽

10.1177/0734242x211029170 ◽

2021 ◽

pp. 0734242X2110291

Author(s):

Navarro Ferronato ◽

Gabriela Edith Guisbert Lizarazu ◽

Marcelo Antonio Gorritty Portillo ◽

Luca Moresco ◽

Fabio Conti ◽

...

Keyword(s):

Developing Countries ◽

Environmental Impacts ◽

Waste Recycling ◽

Construction And Demolition Waste ◽

Primary Data ◽

Demolition Waste ◽

Collection Rate ◽

Material Recycling ◽

Material Recovery ◽

Selective Collection

Construction and demolition waste (CDW) management in developing countries is a global concern. The analysis of scenarios and the implementation of life cycle assessment (LCA) support decision-makers in introducing integrated CDW management systems. This paper introduces the application of an LCA in La Paz (Bolivia), where CDW is mainly dumped in open areas. The aim of the research is to evaluate the benefits of inert CDW recycling in function of the selective collection rate, defined as the amount of waste (%wt.) sorted at the source in relation to the total waste amount produced, and the distances from the CDW generation to the material recycling facility. The outcomes of the research suggest that increasing the selective collection rates (5% to 99%) spread the importance of transportation distances planning since it affects the magnitude of the environmental impacts (1.05 tCO2-eq to 20.7 tCO2-eq per km traveled). Transportation limits have been found to be lower than about 40 km in order to make recycling beneficial for all environmental impacts and for all selective collection rate, with the eutrophication potential as the limiting indicator. The theoretical analysis suggests implementing LCA with primary data and involving statistics related to the transportation of virgin materials avoided thanks to recycling. The outcomes of the research support the implementation of CDW recycling in developing countries since it has been found that material recovery is always beneficial.

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