Optimization of chromium removal by the chromium resistant mutant of the cyanobacteriumAnacystis nidulans in a continuous flow bioreactor

2007 ◽  
Vol 82 (7) ◽  
pp. 652-657 ◽  
Author(s):  
Jasvir IS Khattar ◽  
Tangirala A Sarma ◽  
Anuradha Sharma
Keyword(s):  
Continuous Flow ◽  
Resistant Mutant ◽  
Chromium Removal

scholarly journals Total chromium removal from electroplating wastewater using Artocarpus Altilis leaves as adsorbent with continuous flow

Teknik ◽  
2019 ◽  
Vol 39 (2) ◽  
pp. 114
Author(s):  
Hardoyo Hardoyo ◽  
Nurbaiti Marsas Prilitasari ◽  
Natalina Natalina
Keyword(s):  
Atomic Absorption ◽  
Continuous Flow ◽  
Atomic Absorption Spectrophotometer ◽  
Chromium Removal ◽  
Total Chromium ◽  
Electroplating Wastewater ◽  
Artocarpus Altilis

Limbah cair elektroplating yang mengandung kromium (Cr) merupakan limbah yang berbahaya terhadap lingkungan. Limbah tersebut harus diolah terlebih dahulu sebelum dibuang ke lingkungan.  Salah satu jenis pengolahan limbah cair yang mengandung Cr adalah proses adsorpsi.  Batang dan daun Artocarpus altilis (daun sukun) mempunyai potensi untuk digunakan sebagai adsorben untuk mengolah limbah cair yang mengandung Cr.  Proses aktivasi pada pembuatan adsorben dapat dilakukan secara asam ataupun non asam.  Tujuan dari penelitian ini untuk mengetahui potensi daun sukun untuk mengadsopsi total Cr yang terkandung dalam limbah cair electroplating.  Penelitian ini dilakukan menggunakan reactor dari pipa berukuran panjang 12 cm dan diameter 1,3 cm dengan aliran keatas secara kontinyu.  Debit aliran yang digunakan pada penelitian ini sebesar 0,255 cm3/det.  Total Cr diukur menggunakan Atomic Absorption Spectrophotometer (AAS).  Hasil penelitian menunjukkan bahwa adsorpsi menggunakan  yang dihasilkan dengan proses  asam dapat mereduksi  total-Cr dari 77,45 mg/l menjadi  0,474 mg/l (99,34) %, sedang adsorpsi menggunakan adsorben yang dihasilkan dengan proses non asam hanya menurunkan total-Cr dari 77,45 mg/l  hingga mencapai 4,753 mg/l (93,86 %).  Adsorpsi menggunakan adsorben daun Sukun yang diproduksi melalui proses asam dapat digunakan untuk mengolah limbah cair electroplating yang mengandung Cr sebab konsentrasi limbah terolah lebih rendah 0,5 mg/l ( sesuai Peraturan Menteri Lingkungan Hidup No.5, 2014)

Catalyst- and oxidant-free electrochemical para-selective hydroxylation of N-arylamides in batch and continuous-flow

2020 ◽  
Vol 22 (19) ◽  
pp. 6437-6443
Author(s):  
Cheng-Kou Liu ◽  
Meng-Yi Chen ◽  
Xin-Xin Lin ◽  
Zheng Fang ◽  
Kai Guo
Keyword(s):  
Ammonium Salt ◽  
Quaternary Ammonium ◽  
Continuous Flow ◽  
Quaternary Ammonium Salt ◽  
Selective Hydroxylation

A catalyst-, oxidant-, acidic solvent- and quaternary ammonium salt-free electrochemical para-selective hydroxylation of N-arylamides at rt in batch and continuous-flow was developed.

Development of a Progression-Based Signal-Timing Strategy for Continuous-Flow Intersections

2021 ◽  
Vol 147 (3) ◽  
pp. 04021002
Author(s):  
Wenrui Qu ◽  
Shaojie Liu ◽  
Qun Zhao ◽  
Yi Qi
Keyword(s):  
Continuous Flow ◽  
Signal Timing

Avalanche Stratification - Experimental Tests of the “Metastable Wedge” and “Continuous Flow” Models

2000 ◽  
Vol 627 ◽  
Author(s):  
M. E. Swanson ◽  
M. Landreman ◽  
J. Michel ◽  
J. Kakalios
Keyword(s):  
Continuous Flow ◽  
Granular Media ◽  
Experimental Tests ◽  
Coarse Sand ◽  
Angle Of Repose ◽  
Flow Models ◽  
Maximum Angle ◽  
Stratification Effect ◽  
Upward Moving ◽  
Moving Layer

ABSTRACTWhen an initially homogeneous binary mixture of granular media such as fine and coarse sand is poured near the closed edge of a “quasi-two-dimensional” Hele-Shaw cell consisting of two vertical transparent plates held a narrow distance apart, the mixture spontaneously forms alternating segregated layers. Experimental measurements of this stratification effect are reported in order to determine which model, one which suggests that segregation only occurs when the granular material contained within a metastable heap between the critical and maximum angle of repose avalanches down the free surface, or one for which the segregation results from smaller particles becoming trapped in the top surface and being removed from the moving layer during continuous flow. The result reported here indicate that the Metastable Wedge model provides a natural explanation for the initial mixed zone which precedes the formation of the layers, while the Continuous Flow model explains the observed upward moving kink of segregated material for higher granular flux rates, and that both mechansims are necessary in order to understand the observed pairing of segregated layersfor intermediate flow rates and cell separations.

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