Processing Waste
Recently Published Documents


TOTAL DOCUMENTS

849
(FIVE YEARS 482)

H-INDEX

45
(FIVE YEARS 19)

2021 ◽  
Vol 13 (20) ◽  
pp. 11395
Author(s):  
Alisson Mendes Rodrigues ◽  
Fabiana Pereira da Costa ◽  
Suellen Lisboa Dias Beltrão ◽  
Jucielle Veras Fernandes ◽  
Romualdo Rodrigues Menezes ◽  
...  

This study presents the development of new eco-friendly mortar compositions containing kaolin residues (KR) and assesses their durability behavior. Firstly, the natural and calcinated kaolin residues (600 °C, 650 °C, 700 °C, 750 °C, and 800 °C) were characterized by X-ray diffraction (XRD), differential thermal analysis (DTA), granulometric analysis, and surface area. The kaolin residue calcinated at 800 °C was chosen to be added to new compositions of mortar because it presented the best pozzolanic performance. The aging tests accomplished in internal (Ei) and external (Ee) environments were applied in mortars with a mass proportion of 1:2:6 (cement + KR: lime: sand), in which the KR, calcinated at 800 °C, replaced the cement in the mass fraction of 0%, 5%, 10%, 15%, 20%, and 30%. The Ei was performed for 30, 60, 90, 180, and 360 days, and the Ee for 90; 210; 360; and 512 days. After the aging tests were completed, the mortar compositions containing KR were evaluated to determine their mineralogical phases (XRD), compressive strength (CS), and thermal behavior (DTA and thermogravimetry). In summary, the KR addition to the mortar compositions decreases the mechanical resistance to compression; however, mortars with a substitution of 10% and 20% presented resistance values within the minimum limit of 2.4 MPa established by ASTM C 270.


Author(s):  
Shui-Wen Chang Chien ◽  
Yi-Pei Li ◽  
Cheng-Chung Liu

Abstract Heavy metal contamination in underground water commonly occurs in industrial areas in Taiwan. Wine-processing waste sludge (WPWS) can adsorb and remove several toxic metals from aqueous solutions. In this study, WPWS particles were used to construct a permeable reactive barrier (PRB) for the remediation of a contaminant plume comprising HCrO4−, Cu2+, Zn2+, Ni2+, Cd2+, and AsO43− in a simulated aquifer. This PRB effectively prevented the dispersals of Cu2+, Zn2+, and HCrO4−, and their concentrations in the pore water behind the barrier declined below the control standard levels. However, the PRB failed to prevent the diffusion of Ni2+, Cd2+, and AsO43−, and their concentrations were occasionally higher than the control standard levels. However, 18% to 45% of As, 84% to 93% of Cd, and 16% to 77% of Ni were removed by the barrier. Ni ions showed less adsorption on the fine sand layer because of the layer's ineffectiveness in multiple competitive adsorptions. Therefore, the ions infiltrated the barrier at a high concentration, which increased the loading for the barrier blocking. The blocking efficiency was related to the degree of adsorption of heavy metals in the sand layer and the results of their competitive adsorption.


Author(s):  
Elena E. Kuprina ◽  
◽  
Anastasiya N. Yakkola ◽  
Andrey N. Manuylov ◽  
Elena I. Kiprushkina ◽  
...  

Food edible coatings are an important milestone in food production and one of the innovations in food packaging development. This article presents materials on the development of the formulation and technology for the manufacture of a novel composite coating based on sodium alginate, chitosan and protein hydrolysate obtained by the electrochemical method of double extraction from cod processing waste to obtain edible coatings for semi-finished fish products. Furthermore, the physicochemical, physical, mechanical and microbiological properties of this material are described.


2021 ◽  
Vol 9 (2) ◽  
pp. 280
Author(s):  
Ni Putu Amelia Panida Dewi ◽  
Ida Ayu Gede Bintang Madrini ◽  
I Wayan Tika

ABSTRAK Desa Sanur Kaja memiliki satu depo pengelolaan sampah khusus untuk menangani sampah yang dihasilkan oleh masyarakat desa yang bernama Depo Cemara. Berdasarkan penelitian sebelumnya diketahui bahwa kegiatan yang berjalan di Depo Cemara menjadi kurang efisien karena tidak semua masyarakat desa memilah dan menerapkan prinsip 3R (reduce, reuse, dan recycle) dalam pengelolaan sampah rumah tangga. Penelitian ini bertujuan untuk mengidentifikasi sejauh mana efektivitas sistem pengelolaan sampah yang sudah dilakukan oleh masyarakat Desa Sanur Kaja dengan membandingkan jumlah sampah yang dikelola oleh rumah tangga dengan prinsip 3R dengan jumlah sampah yang terbuang sehingga diperoleh persentase reduksi sampah. Pengumpulan data diperoleh dengan menyebar kuesioner kepada responden yang ditentukan dengan teknik purposive sampling. Data yang diperoleh kemudian dihitung dengan analisis kesetimbangan massa sampah lalu dianalisis lebih lanjut dengan metode analisis statistik deskriptif. Hasil penelitian terhadap 96 rumah tangga menunjukkan bahwa pengelolaan sampah berbasis masyarakat memiliki efektivitas yang rendah karena reduksi sampah yang terjadi hanya 22,5 persen dalam satu hari dan responden yang melakukan pemilahan sampah rumah tangga sebanyak 44 persen. Masyarakat menyatakan setuju terhadap rencana penerapan prinsip 3R dalam pengelolaan sampah rumah tangga serta menganggap penting ditambahkannya fasilitas-fasilitas pendukung pengelolaan sampah.  ABSTRACT Sanur Kaja Village has a special waste management facility for processing waste produced by the village community, namely Depo Cemara. Based on previous research, it is known that activities that are running at Depo Cemara are less efficient because not all village communities sort waste and apply the 3R (reduce, reuse, and recycle) principle in household waste management. This study aims to identify the effectiveness of the waste management system that has been implemented by the people of Sanur Kaja Village by comparing the amount of waste managed by households with the 3R principle with the amount of waste wasted in order to obtain a percentage of waste reduction. Data collection was obtained by distributing questionnaires to respondents who were determined by purposive sampling technique. The data obtained were then calculated by analyzing the mass balance of waste and then further analyzed using descriptive statistical analysis methods. The results of research on 96 households show that community-based waste management is still not effective because the percentage of waste reduction that occurs in one day only 22,5 percent and respondents who sort household waste are 44 percent. The community agreed to the plan to implement the 3R principle in household waste management and considered it important to add supporting facilities for waste management.


Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5586
Author(s):  
Tatiana Vereshchagina ◽  
Ekaterina Kutikhina ◽  
Leonid Solovyov ◽  
Sergei Vereshchagin ◽  
Elena Mazurova ◽  
...  

Co-processing of radioactive effluents with coal fly ash-derived materials is recognized as a resource-saving approach for efficient stabilization/solidification of radioactive components of wastewater. In this context, the paper is focused on the hydrothermal synthesis of Sr2+-bearing aluminosilicate/silicate phases as analogs of a mineral-like 90Sr waste form using hollow glass-crystalline aluminosilicate microspheres from coal fly ash (cenospheres) as a glassy source of Si and Al (SiO2-Al2O3)glass) and Sr(NO3)2 solutions as 90Sr simulant wastewater. The direct conversion of cenosphere glass in the Sr(NO3)2-NaOH-H2O-(SiO2-Al2O3)glass system as well as Sr2+ sorption on cenosphere-derived analcime (ANA) in the Sr(NO3)2-H2O-ANA system were studied at 150–200 °C and autogenous pressure. The solid and liquid reaction products were characterized by SEM-EDS, PXRD, AAS and STA. In the Sr(NO3)2-NaOH-H2O-(SiO2-Al2O3)glass system, the hydrothermal processing at 150–200 °C removes 99.99% of the added Sr2+ from the solution by forming Sr-tobermorite and Sr-plagioclase phases. In the Sr(NO3)2-H2O-ANA system, Sr2+ sorption on analcime results in the formation of solid solutions (Na1−nSrn/2)AlSi2O6·H2O of the Na-analcime–Sr-wairakite series. The results can be considered as a basis for the development of environmentally sustainable technology for 90Sr removal from wastewater and immobilization in a mineral-like form by co-processing waste from coal-fired and nuclear power plants.


2021 ◽  
Vol 143 ◽  
pp. 112191
Author(s):  
Xinda Zou ◽  
Amrit BK ◽  
Tareq Abu-Izneid ◽  
Ahsan Aziz ◽  
Popy Devnath ◽  
...  

Sign in / Sign up

Export Citation Format

Share Document