Judul: Estimation of Leachate Effluent  Quality in Stabilization Contact Unit Based on Biokinetic Parameters stabilization  process
Abstrak: Kandungan polutan organik yang terkandung pada air lindi melebihi baku mutu berdasarkan Permen LHK Nomor P.59/MENLHK/Setjen/Kum.1/7/2016 tentang Baku Mutu Air Lindi Bagi Usaha dan/atau Kegiatan Tempat Pemrosesan Akhir Sampah. Pengolahan biologis kontak stabilisasi dirancang untuk mendegradasi kandungan polutan organik air lindi. Penelitian ini bertujuan mengestimasi efluen air lindi berdasarkan parameter biokinetika unit stabilisasi. Prosedur penelitian skala laboratorium dilakukan dalam empat tahap, antara lain tahap persiapan, tahap pengambilan sampel, tahap pengujian reaktor pada kondisi tidak tunak, dan tahap analisis laboratorium. Persamaan umum biokinetika yang digunakan antara lain Monod, Contois, Blackman, dan Chen-Hashimoto. Berdasarkan hasil perhitungan dan uji validasi, parameter biokinetika terpilih diperoleh melalui persamaan Blackman dengan nilai Ke, Y, μmax, Ks sebesar 2,05 hari-1 ; 32,88 mgMLVSS/mgCOD; 0,57 hari-1 ; 24,38 mg/L. Konsentrasi efluen rata rata yang diperoleh melalui persamaan Blackman berdasarkan variasi waktu detensi 4 – 6 jam berturut-turut sebesar 208,46 ± 23,35 mg/L; 173,39 ± 54,03 mg/L; 146,83 ± 30,46 mg/L., The content of organic pollutants contained in leachate exceeds the quality standard based on the Minister of Environment and Forestry Regulation No. P.59/Menlhk/Setjen/Kum.1/7/2016 concerning Leachate Water Quality Standards for Business and/or Activities of Waste Final Processing Sites. The stabilizing contact biological treatment is designed to degrade the organic pollutant content of leachate. This study aims to estimate the leachate effluent based on the biokinetic parameters of the stabilization unit. The laboratory-scale research procedure is carried out in four stages, including the preparation stage, the sampling stage, the reactor testing stage under unsteady-state conditions, and the laboratory analysis stage. The general biokinetic equations used include Monod, Contois, Blackman, and Chen-Hashimoto. Based on the results of calculations and validation tests, the selected biokinetic parameters were obtained through the Blackman equation with the values of Ke, Y, μmax, Ks of 2.05 day-1 ; 32.88 mgMLVSS/mgCOD; 0.57 day-1 ; 24.38 mg/L. The average effluent concentration obtained through the Blackman equation based on the variation of detention time 4 – 6 hours in a row was 208.46 ± 23.35 mg/L; 173.39 ± 54.03 mg/L; 146.83 ± 30.46 mg/L.
Keyword: Air lindi, biokinetika, kontak stabilisasi, Biokinetics, leachate, stabilization contact

Judul: Efek Fosfor Terhadap Estimasi Parameter Biokinetika Dalam Evaluasi Kinerja Unit Kontak Stabilisasi Pengolahan Air Lindi
Abstrak: Tempat pembuangan sampah menghasilkan polusi air dalam kuantitas yang besar, sehingga membutuhkan unit pengolahan kontak stabilisasi guna mereduksi kandungan pencemar pada air lindi. Penelitian ini bertujuan untuk memperoleh hubungan biokinetika terrhadap kinerja unit kontak dalam rangka meningkatkan efisiensi terhadap peningkatan kualitas efluen tangki kontak. Penelitian diawali dengan mengkonfigurasi tangki kontak stabilisasi, menganalisis parameter kualitas air limbah, memprediksi parameter biokinetic, dan memprediksi biokinetika untuk memperkirakan kualitas air limbah dan aspek desain. Berdasarkan hasil penelitian, persentase efisiensi Chemical Oxygen Demand (COD) pada masing-masing waktu detensi (HRT) tangki kontak 2, 3, dan 4 jam berturut-turut sebesar 26,9%; 35,1%; dan 46,5%. Pengaruh biokinetika terhadap unit pengolahan tangki kontak tidak hanya untuk memprediksi pengolahan air limbah, tetapi juga untuk merancang, mengoperasikan, dan mengontrol sistem pengolahan. dst .., Landfills produce water pollution in large quantities, which requiring a contact stabilization treatment unit to reduce the pollutant content in leachate. This study aims to obtain a biokinetic relationship to the performance of the contact unit in order to enchance contaminant efficiency for improving the quality effluent. The research was started by configurating contact stabilization tank, analyzing the wastewater quality parameters, predicting biokinetic parameters, and predicting biokinetics to estimate water quality effluent and design aspect. Based on result of the research, the percentages of Chemical Oxygen Demand (COD) efficiency in each Hydraulic Retention Time (HRT) contact tank 2, 3, and 4 hours, respectively, were 26.9%; 35.1%; and 46.5%, respectively. The effect of biokinetics on contact tank treatment units is not only to predict wastewater treatment, but also to design, operate and control treatment systems. dst ...
Keyword: Biokinetic, contact stabilization, hydraulic retention time, leachate, phosporus

Judul: Penggunaan Teorema Homeomorphy 2-Manifold dan Teorema Euler Poincare pada Torus 𝑇�� dan Simplicial Complex 𝐾��
Abstrak: Two dimensional topological spaces are said to be homeomorphic if they have the same topological invariant, where one of topological invariant used is an Euler characteristic. Homeomorphy 2-Manifold’s Theorem and Euler Poincare’s Theorem are used to distinguish two topological spaces. Homeomorphy 2-Manifold’s Theorem uses Euler characteristic to identify two dimensional topological spaces. Euler Poincare’s Theorem is an alternative way to find Euler characteristic with Betti number, which is topological invariant as well. The objective of this paper is to investigate the homeomorphism of torus 𝑇����� and simplicial complex 𝐾�����. Topological space torus and simplicial complex 𝐾����� have the same Euler characteristic, which is two. Based on Homeomorphy 2-Manifold’s Theorem topological space torus 𝑇����� and simplicial complex 𝐾����� is homeomorphic.
Keyword: simplicial, torus, Euler, homeomorphism, topology