scholarly journals Influence of the characteristics of biogas generated in the leather industry on combustion quality

2018 ◽  
Vol 22 (Suppl. 5) ◽  
pp. 1349-1357 ◽  
Author(s):  
Lucian Mihaescu ◽  
Gheorghe Lazaroiu ◽  
Gabriel Negreanu ◽  
Ionel Pisa
Keyword(s):  
Combustion Velocity ◽  
Experimental Tests ◽  
Flame Velocity ◽  
Leather Industry ◽  
Protein Waste ◽  
Stable Flame ◽  
Ch4 Concentration ◽  
Equality Condition ◽  
Combustion Technique ◽  
Pilot Burner

The treatment of protein waste in the leather industry also includes transformation into biogas through anaerobic digestion. A pilot plant producing biogas with a 45-60% CH4 concentration was designed for this purpose. Starting from primary experimental tests in a Bunsen burner, the paper presents the theoretical aspects of choosing the best combustion technique for this peculiar gaseous fuel in order to calculate the combustion velocity and checking the conditions for the flame stability. The applicability of the kinetic combustion (with pre-mix) will be attempted, because low combustion rates for this fuel also involve low air velocities. Diffusive combustion seems to not be affected by this impediment, as there is always an equality condition of flame velocity with burning speed, so a theoretical spot of a stable flame. After selecting the best combustion technique, a pilot burner will be designed and tested.

scholarly journals Bio-agent de retanare utilizat in procesarea pieilor si procedeu de obtinere

2019 ◽  
Vol 70 (11) ◽  
pp. 3878-3880
Author(s):  
Rodica Roxana Constantinescu ◽  
Gabriel A. Zainescu ◽  
Marian Crudu ◽  
Gheorghe Bostaca
Keyword(s):  
Waste Treatment ◽  
Leather Industry ◽  
Complex Products ◽  
Leather Processing ◽  
Protein Waste ◽  
Starting Point ◽  
Filling Agent ◽  
Treatment And Disposal ◽  
Biochemical Degradation ◽  
Very High

Currently, the leather industry has to deal with very high costs for waste treatment and disposal. As a result, it is recommended to subject the organic protein waste from tanning to biochemical treatments for recycling in the industry. The degree of novelty lies primarily in the fact that the starting point of the promoted technologies is obtaining new complex products by processing organic waste and using it in tanneries. The lime fleshings resulting from the hide fleshing operation represents the highest amount of reusable leather material of approx. 25%. This paper presents an innovative process for the biochemical degradation of hide waste resulting from hide fleshing in order to obtain a retanning/filling agent used in leather processing.

scholarly journals Bio-agent de retanare utilizat in procesarea pieilor si procedeu de obtinere

2019 ◽  
Vol 70 (11) ◽  
pp. 3878-3880
Author(s):  
Rodica Roxana Constantinescu ◽  
Gabriel A. Zainescu ◽  
Marian Crudu ◽  
Gheorghe Bostaca
Keyword(s):  
Waste Treatment ◽  
Leather Industry ◽  
Complex Products ◽  
Leather Processing ◽  
Protein Waste ◽  
Starting Point ◽  
Filling Agent ◽  
Treatment And Disposal ◽  
Biochemical Degradation ◽  
Very High

Currently, the leather industry has to deal with very high costs for waste treatment and disposal. As a result, it is recommended to subject the organic protein waste from tanning to biochemical treatments for recycling in the industry. The degree of novelty lies primarily in the fact that the starting point of the promoted technologies is obtaining new complex products by processing organic waste and using it in tanneries. The lime fleshings resulting from the hide fleshing operation represents the highest amount of reusable leather material of approx. 25%. This paper presents an innovative process for the biochemical degradation of hide waste resulting from hide fleshing in order to obtain a retanning/filling agent used in leather processing.

scholarly journals Smart biopolymers from protein wastes used in agriculture

2020 ◽  
Author(s):  
Rodica Roxana Constantinescu ◽  
Gabriel Zainescu ◽  
Iulia Caniola
Keyword(s):  
Chemical Composition ◽  
High Performance ◽  
Collagen Matrix ◽  
Extensive Study ◽  
Natural Polymers ◽  
Leather Industry ◽  
Smart Hydrogel ◽  
Area Of Interest ◽  
Protein Waste ◽  
Analysis System

The area of interest is the synthesis and study of properties of new types of hydrogels made from pelt waste, in order to recover waste from tanneries. The complex aspects related to protein projects in the leather industry are addressed by accurately determining a chemical composition, a skin designer and a different possibility of recovery and claiming a value, the use of biotechnology. The complex aspects related to protein waste in the leather industry are addressed by accurately determining the chemical composition of leather waste and the different possibilities of recovery and recycling using biotechnology. The technologies used in order to obtain a smart hydrogel based on collagen and natural polymers are non-polluting and waste-free. An important aspect to note is that the smart hydrogel is obtained through an almost identical technological process to the one used for medical collagen. An extensive study of the potential for reuse and recycling of leather protein waste in ecological conditions by developing innovative procedures for obtaining an NPK collagen matrix to be used successfully as smart fertilizer for modifying nutrient-poor soils. Hydrogels with collagen structure are characterized by a high-performance instrumental analysis system (FT-IR-ATR, SEM, EDAX, etc.).

scholarly journals Pelt waste degradation using active microbial consortia

2020 ◽  
Author(s):  
Rodica Roxana Constantinescu ◽  
Gabriel Zainescu ◽  
Mariana Ferdes ◽  
Iulia Caniola
Keyword(s):  
Degradation Process ◽  
Point Of View ◽  
Microbial Consortia ◽  
Leather Industry ◽  
The Sustainable Development ◽  
Production Methods ◽  
Leather Processing ◽  
Protein Waste ◽  
Waste Degradation ◽  
By Products

In tanneries, environmental problems have special implications in terms of optimizing the consumption of used chemicals, applied technologies, the degree of recovery of useful substances from leather waste. Biodegradation is the process by which organic substances are broken down by microorganisms. From an ecological point of view, biodegradability assessments of new materials and compounds in the industry are essential to understand and quantify their impact on the environment. The sustainable development of the leather industry has focused on major environmental issues, such as clean production methods and waste management. Tanneries generate huge quantities of solid wastes as pelt waste. If these bio-waste materials are not utilized properly, they are potential source of pollution. Microbiological degradation of pelt waste is amongst the permanent concerns of leather processing units. The process may have the purpose of decomposing waste to exploit by-products as biocompost or to obtain proteases through a biotechnological process. These enzymes can be used after purification in various processes that have animal protein as a substrate. They can also be used in raw state for enzymatic hydrolysis. The paper aims at development of an experimental model on the bioenzymatic degradation process of protein waste from tanneries.

Randomized Experimental Tests of Mediation Models

2011 ◽  
Author(s):  
Charles E. Lance ◽  
Richard P. DeShon ◽  
Eugene Stone-Romero
Keyword(s):  
Experimental Tests ◽  
Mediation Models
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