scholarly journals Waste acid recycling via diffusion dialysis

1995 ◽  
Author(s):  
C. Steffani
Keyword(s):  
Diffusion Dialysis ◽  
Waste Acid

PERFORMANCE OF DIFFUSION DIALYSIS FOR PICKLING EFFLUENT OPERATING UNDER A HIGH FLOW RATE

2016 ◽  
Vol 78 (5-3) ◽  
Author(s):  
Chantapala S. ◽  
Somattanai W. ◽  
Sudtida P. Thanasupsin
Keyword(s):  
Flow Rate ◽  
Metal Ion ◽  
Ionic Concentration ◽  
Feed Ratio ◽  
Driving Mechanism ◽  
Feed Flow Rate ◽  
Treatment Unit ◽  
Ion Rejection ◽  
Diffusion Dialysis ◽  
Waste Acid

Diffusion dialysis (DD) is a membrane separation process. The major driving mechanism is an ionic concentration gradient. An anion-exchange membrane (AEM) equipped with DD is efficiently used for purifying waste acid and metal ion separation. The goal of this laboratory-scale study is to investigate the efficiency of a diffusion dialyser (model HKY-001), which was equipped with an AEM (model DF120), to purify waste acid solution (sulphuric acid). This study was conducted with actual waste acid from a pickling bath of an electroplating manufacturer in Samut Prakarn Province. In the experimental tests, the operating parameters, such as time to reach equilibrium, feed flowrate, water to feed (Qwater/Qfeed) and type of stripping water, were varied. To examine the performance of this treatment unit, the concentration of H+ (mol.L-1), acid recovery (% as H+) and metal ion rejection (%) were monitored regularly. In conclusion, increasing the feed flow rate will likely decrease the H+ recovery (%). The rejection (%) of Zn, Mn and Pb is likely to increase with increases in the feed flow rate. A higher metal ion rejection (%) can be achieved at a lower water-to-feed ratio.  

Recovery of HSO from waste acid solution by a diffusion dialysis method

2005 ◽  
Vol 124 (1-3) ◽  
pp. 230-235 ◽  
Author(s):  
J JEONG ◽  
M KIM ◽  
B KIM ◽  
S KIM ◽  
W KIM ◽  
...  
Keyword(s):  
Acid Solution ◽  
Dialysis Method ◽  
Diffusion Dialysis ◽  
Waste Acid

Aplikasi Pendayagunaan Asam In-Situ pada Kulit Pikel Terbuang untuk Pembuatan Gelatin Pangan

2016 ◽  
Vol 9 (2) ◽  
pp. 187-197
Author(s):  
Sugihartono Sugihartono
Keyword(s):  
Food Industry ◽  
Type A ◽  
Collagen Fibers ◽  
Final Phase ◽  
Acid Base ◽  
Salt Hydrate ◽  
Food Grade ◽  
Hydrolyze Collagen ◽  
Waste Acid

Skinswaste at pre-tanning operations can be processed into food grade gelatin. The degradation of collagen using acid, base, or enzymes produced gelatin. Pickle skins is skins that acidified, the results of the final phase of the pre-tanning operations. The addition of salt on the skin makes the skins pickle not swollen, produced a wide space between collagen fibers and collagen can not be degraded. Thereby directly extract pickle skins or waste will not be obtained gelatin.This study discussed the processing of food gelatin type A pickle skins through the utilization of waste acid it contains. The discussion includes the components of animal skins, pre-tanning waste, acidification of skins, processing gelatin and gelatin from skins picklewaste and usefulness for the food industry. Salt hydrate collagen fibers in the skin pickle including waste can be separated by washing, to a certain extent still acidic skins waste. The remaining acid on the skins pickle waste can be utilized to hydrolyze collagen into gelatin. The resulting gelatin is gelatin type A, that can be used for food industry.ABSTRAKKulit limbah pada operasi pra-penyamakan dapat diolah menjadi gelatin pangan. Pemecahan kolagen menggunakan asam, basa, atau enzim dihasilkan gelatin. Kulit pikel merupakan kulit yang diasamkan, hasil dari tahap akhir operasi pra-penyamakan. Penambahan garam pada kulit pikel menjadikan kulit tidak bengkak, menghasilkan ruang lebar diantara serat kolagen dan menjadikan kolagen tidak dapat terdegradasi. Hal ini berarti ekstrak secara langsung kulit pikel atau limbahnya tidak akan diperoleh gelatin. Dalam kajian ini dibahas pengolahan gelatin pangan tipe A dari kulit pikel limbah melalui pendayagunaan asam yang dikandungnya. Bahasan mencakup komponen kulit hewan, limbah pra-penyamakan, pengasaman kulit, pengolahan gelatin, dan pengolahan gelatin dari kulit pikel limbah melalui pendayagunaan asam yang dikandungnya serta kegunaannya untuk industri pangan. Garam yang menghidrasi serat kolagen pada kulit pikel termasuk limbahnya dapat dipisahkan dengan cara pencucian, sampai batas tertentu kulit limbah masih bersifat asam. Asam yang tersisa pada kulit pikel limbah tersebut dapat didayagunakan untuk menghidrolisis kolagen menjadi gelatin. Gelatin yang dihasilkan adalah gelatin tipe A, dapat digunakan untuk keperluan industri pangan. Kata kunci : Kulit pikel limbah, gelatin, pengasaman, pangan.

scholarly journals Innovative BPPO Anion Exchange Membranes Formulation Using Diffusion Dialysis-Enhanced Acid Regeneration System

Membranes ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 311
Author(s):  
Muhammad Imran Khan ◽  
Majeda Khraisheh ◽  
Fares AlMomani
Keyword(s):  
Anion Exchange ◽  
Room Temperature ◽  
Feed Solution ◽  
Exchange Capacity ◽  
Anion Exchange Membranes ◽  
Regeneration System ◽  
Waste Streams ◽  
Acid Recovery ◽  
Aqueous Waste ◽  
Diffusion Dialysis

Recycling of acid from aqueous waste streams is crucial not only from the environmental point of view but also for maturing the feasible method (diffusion dialysis). Anion exchange membrane (AEM)–based diffusion dialysis process is one of the beneficial ways to recover acid from aqueous waste streams. In this article, the synthesis of a series of brominated poly (2, 6–dimethyl-1, 4–phenylene oxide) (BPPO)-based anion exchange membranes (AEMs) through quaternization with triphenylphosphine (TPP) were reported for acid recovery via diffusion dialysis process. The successful synthesis of the prepared membranes was confirmed by Fourier transform infrared (FTIR) spectroscopy. The as-synthesized anion exchange membranes represented water uptake (WR) of 44 to 66%, ion exchange capacity of (IEC) of 1.22 to 1.86 mmol/g, and linear swelling ratio (LSR) of 8 to 20%. They exhibited excellent thermal, mechanical, and acid stability. They showed homogeneous morphology. The acid recovery performance of the synthesized AEMs was investigated in a two compartment stack using simulated mixture of HCl and FeCl2 as feed solution at room temperature. For the synthesized anion exchange membranes TPP–43 to TPP–100, the diffusion dialysis coefficient of acid (UH+) was in the range of 6.7 to 26.3 (10−3 m/h) whereas separation factor (S) was in the range of 27 to 49 at 25 °C. Obtained results revealed that diffusion dialysis performance of the synthesized AEMs was higher than the commercial membrane DF–120B (UH+ = 0.004 m/h, S = 24.3) at room temperature. It showed that the prepared AEMs here could be excellent candidates for the diffusion dialysis process.

Separation and recovery of sulfuric acid from acidic vanadium leaching solution by diffusion dialysis

2012 ◽  
Vol 96 ◽  
pp. 44-49 ◽  
Author(s):  
Wang Li ◽  
Yimin Zhang ◽  
Jing Huang ◽  
Xiaobo Zhu ◽  
Yi Wang
Keyword(s):  
Sulfuric Acid ◽  
Leaching Solution ◽  
Diffusion Dialysis
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