Biosorption Process for Treatment of Electroplating Wastewater Containing Cr(VI):  Laboratory-Scale Feasibility Test

2006 ◽  
Vol 45 (14) ◽  
pp. 5059-5065 ◽  
Author(s):  
Donghee Park ◽  
Yeoung-Sang Yun ◽  
Ji Hye Jo ◽  
Jong Moon Park
Keyword(s):  
Laboratory Scale ◽  
Electroplating Wastewater ◽  
Biosorption Process ◽  
Feasibility Test

Cadmium electroplating wastewater treatment using a laboratory-scale electrodialysis system

2004 ◽  
Vol 37 (3) ◽  
pp. 247-255 ◽  
Author(s):  
Luciano Marder ◽  
Andréa Moura Bernardes ◽  
Jane Zoppas Ferreira
Keyword(s):  
Wastewater Treatment ◽  
Laboratory Scale ◽  
Electroplating Wastewater

Low-temperature Conversion of Fe-rich Sludge to KFeS2 Whisker: a New Flocculant Synthesis From Laboratory Scale to Pilot Scale

2021 ◽  
Author(s):  
Dongxu Liang ◽  
Yu Chen ◽  
Suiyi Zhu ◽  
Yidi Gao ◽  
Tong Sun ◽  
...  
Keyword(s):  
Low Temperature ◽  
Cold Rolling ◽  
Freeze Drying ◽  
Pilot Scale ◽  
Laboratory Scale ◽  
Raw Material ◽  
Electroplating Wastewater ◽  
One Dimensional ◽  
Electroplating Effluent ◽  
Pure Grade

Abstract KFeS2 is a one-dimensional material and commonly used raw material for synthesising AgFeS2 and CuFeS2. With the solvothermal method, KFeS2 cluster could be synthesised at 190 °C with chemically pure grade Fe salt as Fe source. Herein, a KFeS2 whisker was formed in mass production at a low temperature, with waste cold-rolling sludge as Fe source, and exhibited good performance in the removal of Zn/Ni from real electroplating effluent. At laboratory scale, results showed that KFeS2 was not generated after heating at 50 °C for 24 h; however, after heating at 80 °C for 10 h, KFeS2 whisker (diameter and length of 0.2 and 0.5–1 mm, respectively) was produced, which grew radially to 1–4 mm after 24 h. This method was applied at pilot scale, where a similar KFeS2 whisker was also produced with waste cold-rolling sludge as Fe source. At pilot scale, a residual brownish supernatant was observed after the reaction and then completely recycled in the next round for KFeS2 synthesis. After recycling five times, the produced KFeS2 whisker did not change. For KFeS2 drying, freeze-drying and vacuum-drying were applicable, whilst air-drying was not profitable. The prepared KFeS2 was spontaneously hydrolysed in electroplating wastewater to generate Fe/S-bearing oxyhydroxide colloid for Zn/Ni removal. By adding 1 g of KFeS2, the residual levels of Zn/Ni were 0.22 and 0.02 mg/L, met the discharge standard of electroplating wastewater. Undried KFeS2 showed similar efficiencies of Zn/Ni removal to dried KFeS2, whose efficiencies were apparently higher than those with Na2S·9H2O, polymeric ferric sulfuric, sodium diethyldithiocarbamatre and lime. With the method, KFeS2 whisker was produced at pilot scale without generating any secondary waste and exhibited good performance in the treatment of electroplating wastewater.

Metal Recovery from Electroplating Wastewater Using Acidophilic Iron Oxidizing Bacteria:  Pilot-Scale Feasibility Test

2005 ◽  
Vol 44 (6) ◽  
pp. 1854-1859 ◽  
Author(s):  
Donghee Park ◽  
Dae Sung Lee ◽  
Jong Moon Park ◽  
Hee Dong Chun ◽  
Sung Kook Park ◽  
...  
Keyword(s):  
Pilot Scale ◽  
Metal Recovery ◽  
Electroplating Wastewater ◽  
Iron Oxidizing Bacteria ◽  
Feasibility Test

Pemanfaatan Cangkang Pensi (Corbicula Moltkiana) sebagai Bahan Penyerap Zat Warna Rhodamin B Dalam Larutan

2019 ◽  
Vol 2 (2) ◽  
Author(s):  
Rahmiana Zein ◽  
Mutia Khuratul Aini ◽  
Hermansyah Aziz
Keyword(s):  
Rhodamine B ◽  
Sem Analysis ◽  
Spectra Analysis ◽  
Biosorption Capacity ◽  
Biosorption Process ◽  
Langmuir Isotherm Model ◽  
Ft Ir ◽  
Cationic Exchange ◽  
Rhodamin B ◽  
Model Isotherm

Biosorpsi zat warna Rhodamine B menggunakan cangkang Pensi (Corbicula moltkiana) telah dikaji. Percobaan dilakukan dengan system batch guna memperoleh kondisi optimum biosorspi zat warna. Kapasitas biosorpsi zat warna pada pH 2 adalah 0.9958 mg/g, dengan konsentrasi larutan mula-mula 150 mg/L waktu kontak 105 menit, massa biosorben 0.1 g, ukuran partikel 32 µm dan temperature pengeringan biosorben pada 75oC. Model isotherm Langmuir menunjukkan bahwa proses penyerapan berlangsung secara kimia dan biosorpsi homogeny dari adsorbat (Rhodamine B) pada permukaan biosorben membentuk lapisan tunggal dengan nilai R2 0.9966. Analisis XRF menunjukkan bahwa penurunan kadar unsur logam pada cangkang Pensi membuktikan bahwa proses biosorpsi berlangsung dengan pertukaran kation. Hasil analisis spektrum FT-IR membuktikan adanya interaksi antaramolekul Rhodamin B dengan gugus fungsi pada cangkang Pensi. Analisis dengan SEM memperlihatkan bahwa pori-pori cangkang Pensi telah terisi penuh oleh molekul Rhodamin B. Kondisi optimum biosorpsi telah diaplikasikan pada limbah kerupuk merah dengan kapasitas penyerapan sebesar 0,2835 mg/g.   The biosorption of Rhodamine B dyes by Pensi (Corbicula moltkiana) shell has been investigated. The experiment was conducted in batch sistem in order to obtain the optimum conditions of dye biosorption. Biosorption capacity of dye was 0.9958 mg/g at pH 2, initial concentration 150 mg/L, contact time 105 minutes, biosorbent mass 0.1 gram, particle size 32 µ m and biosorbent drying temperature was at 75oC. The Langmuir Isotherm model showed chemisorption and homogeneous biosorption process of adsorbates onto the biosorbent surface formed monolayer dye molecules on the biosorbent surface with R2 value was 0.9966. XRF analysis showed that reduction of metals unsure quantity of pensi shell indicated biosorption process was occupied through cationic exchange. The result of FTIR spectra analysis indicated an interaction between Rhodamin B molecules and functional group of pensi shell. SEM analysis showed that the pensi shell pores were completely filled by Rhodamine B molecules. The optimum condition of biosorption has been aplicated in red chips wastewater industry with biosorption capacity was 0.2835 mg/g.

DEVELOPMENT OF MACAMI (MARI MEMBACA DAN MEMAHAMI) INSTRUMENT USING MACROMEDIA FLASH 8 IN PRIMARY SCHOOLS

2020 ◽  
Vol 4 (3) ◽  
pp. 544
Author(s):  
Ermaida Dewi
Keyword(s):  
Reading Comprehension ◽  
Primary School ◽  
Product Design ◽  
Primary Schools ◽  
Measuring Instrument ◽  
School Students ◽  
Average Percentage ◽  
Measuring Devices ◽  
Comprehension Ability ◽  
Feasibility Test

The background of this research is an instrument of learning for reading comprehension which in general is still dominated by an instrument in the form of print out which makes the students’ interest to read is reduced. In addition, this instrument is usually done manually or handwritten so that the students’ work must be corrected manually and require some time to get the results. This study aims to develop instruments or measuring devices for reading comprehension in the Primary School in Pekanbaru and find out the feasibility of measuring devices for reading comprehension skills. This product is Macromedia Flash 8 based namely "MaCaMi" which stands forMari Membaca dan Memahami. The research method used was the 4D model with four stages, such as the define stage, the design phase, the develop phase, and the dessiminate stage which is limited to the third stage. The data of this study were obtained from product design expert validation questionnaire, questionnaire validated by linguists, teacher response questionnaire and students response questionnaire. The data were generated quantitatively and analyzed by using the assessment criteria to determine the product quality. The results of this study showed the assessment of product design experts in draft 1 had an average percentage of 69.61% with the appropriate category then had increased in draft 2 to 90.56% with the very feasible category. The results of  the feasibility test by linguists in draft 1 with had average percentage of 95.30% with the very feasible category then increased in draft 2 to 97.20% withn the very feasible category. The results of the teacher's response to the reading comprehension measuring instrument in the Primary School in Pekanbaru developed by researchers obtained an average percentage of 93.50% with a very good category and the results of students' responses to the measuring instrument obtained an average percentage of 89.90% with a category very good. Based on these results, it can be concluded that the product developed by researchers is feasible to be used as a measure of reading comprehension ability of primary school students.

EVALUATION OF A LABORATORY-SCALE HYBRID ROCKET ENGINE'S PERFORMANCE

2014 ◽  
Vol 13 (2) ◽  
pp. 123-139
Author(s):  
V. Brahmbhatt ◽  
David R. Greatrix ◽  
J. Karpynczyk ◽  
A. P. Trumpour
Keyword(s):  
Laboratory Scale ◽  
Hybrid Rocket

Compact and Laboratory―Scale Calendering Unit

2015 ◽  
Vol 69 (2) ◽  
pp. 131-134
Author(s):  
Masaru Futaba
Keyword(s):  
Laboratory Scale
Sign in / Sign up

Export Citation Format

Share Document