scholarly journals ANALISA DISPERSI PM2,5 MENGGUNAKAN MODEL GAUSS POINT SOURCE DIKAWASAN INDUSTRI DAN DESAIN VENTURI SCRUBBER BESERTA IPAL UNTUK EFFLUENT VENTURI (Studi Kasus : Industri Peleburan Aluminium PT.X Kecamatan Kesamben, Jombang)

2020 ◽  
Vol 12 (2) ◽  
pp. 44-52
Author(s):  
Ida Dwi Maharani ◽  
Mohammad Razif

Kegiatan Industri Peleburan Aluminium PT.X mengakibatkan kualitas udara di sekitar industri menurun hal tersebut ditandai oleh beberapa keluhan dari masyarakat, PM2,5 merupakan salah satu partikulat yang ditimbulkan dari proses peleburan aluminium yang mana sangat berpengaruh negatif terhadap kesehatan manusia. Tujuan dari penelitian adalah menganalisis konsentrasi PM2,5 di kawasan penduduk menggunakan model gauss point source serta mendesain alat pengendali pencemar udara venturi scrubber untuk dapur peleburan aluminium beserta instalasi pengolahan air limbah. Hasil perhitungan menunjukkan bahwa konsentrasi PM2,5 di kawasan industri PT.X titik 1 (50 m dari lokasi industri) yaitu 2,7 x 10-5/m3, titik 2 (100 m dari lokasi industri) yaitu 6,7 x 10-6/m3, titik 3 (200 m dari lokasi industri) yaitu 1,6 x 10-6/m3 dari ketiga titik tersebut masih memenuhi baku mutu udara ambient Peraturan Pemerintah Republik Indonesia No. 41 Tahun 1999. Hasil perhitungan desain venturi scrubber diperoleh dimensi venturi diameter throat  (lebar) 0,55 m, panjang throat 1,65 m, dan panjang bagian diverging 2,2 m prosentase removal partikulat PM2,5 sebesar 95% dan hasil perhitungan desain IPAL diperoleh untuk bangunan koagulasi dengan dimensi Panjang 0,86 m, lebar 0,86 m dan tinggi 1,2 m, bangunan Flokulasi  diperoleh panjang 2,1 m , lebar 4,2 m dan tinggi 2 m, bangunan Sedimentasi dengan diameter 5,6 m dan tinggi 1,57 m. Rencana Anggara Biaya dari perhitungan desain didapatkan untuk desain Venturi Scrubber dan IPAL yaitu sebesar Rp. 83.647.421.

Author(s):  
D. A. Carpenter ◽  
Ning Gao ◽  
G. J. Havrilla

A monolithic, polycapillary, x-ray optic was adapted to a laboratory-based x-ray microprobe to evaluate the potential of the optic for x-ray micro fluorescence analysis. The polycapillary was capable of collecting x-rays over a 6 degree angle from a point source and focusing them to a spot approximately 40 µm diameter. The high intensities expected from this capillary should be useful for determining and mapping minor to trace elements in materials. Fig. 1 shows a sketch of the capillary with important dimensions.The microprobe had previously been used with straight and with tapered monocapillaries. Alignment of the monocapillaries with the focal spot was accomplished by electromagnetically scanning the focal spot over the beveled anode. With the polycapillary it was also necessary to manually adjust the distance between the focal spot and the polycapillary.The focal distance and focal spot diameter of the polycapillary were determined from a series of edge scans.


2020 ◽  
Vol 64 (1-4) ◽  
pp. 621-629
Author(s):  
Yingsong Zhao ◽  
Cherdpong Jomdecha ◽  
Shejuan Xie ◽  
Zhenmao Chen ◽  
Pan Qi ◽  
...  

In this paper, the conventional database type fast forward solver for efficient simulation of eddy current testing (ECT) signals is upgraded by using an advanced multi-media finite element (MME) at the crack edge for treating inversion of complex shaped crack. Because the analysis domain is limited at the crack region, the fast forward solver can significantly improve the numerical accuracy and efficiency once the coefficient matrices of the MME can be properly calculated. Instead of the Gauss point classification, a new scheme to calculate the coefficient matrix of the MME is proposed and implemented to upgrade the ECT fast forward solver. To verify its efficiency and the feasibility for reconstruction of complex shaped crack, several cracks were reconstructed through inverse analysis using the new MME scheme. The numerical results proved that the upgraded fast forward solver can give better accuracy for simulating ECT signals, and consequently gives better crack profile reconstruction.


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