Judul: Penerapan Bakteri sebagai Agen Bioremediasi dalam Mereduksi Limbah Organik Danau Ebony, Pantai Indah Kapuk, Jakarta Utara
Abstrak: Danau Ebony yang menerapkan polder system sebagai penampung air diindikasikan banyak menerima bahan organik yang dapat menyebabkan tingginya beban bahan organik perairan danau. Masuknya limbah organik ke perairan dalam jumlah berlebih akan menyebabkan meningkatnya beban nutrient ke perairan. Selain itu, juga akan memicu pertumbuhan mikroalga secara cepat yang dapat mengganggu keseimbangan ekosistem perairan. Bakteri dapat digunakan sebagai agen bioremediasi limbah organik Danau Ebony. Hasil penelitian menunjukkan bahwa penerapan bakteri tipe VannaPro dan Super PS mampu mereduksi limbah organik. Waktu efektif bakteri dalam mereduksi limbah organik adalah pada 6 hari pertama. Perlakuan yang paling efektif dalam mereduksi limbah organik adalah VannaPro. Perlakuan tersebut mampu menurunkan nilai COD mencapai 88,71% pada hari ke-6 dan meningkatkan jumlah koloni bakteri hingga 51,6 x 105 cfu/mL. Dosis bakteri yang efektif dalam mereduksi limbah organik Danau Ebony adalah VannaPro dua kali dosis anjuran.
Keyword: bakteri, bioremediasi, limbah organik

Judul: Aplikasi Salvinia molesta dan Pistia stratiotes sebagai Agen Bioremediasi untuk Memperbaiki Kualitas Perairan Danau Ebony Jakarta Utara
Abstrak: The Polder System of Ebony Lake receive water from household drainase and run-off input, Ebony Lake has high turbidity and bad odor, it indicated the occurrence of organic matter pollution. The purpose of this study was to examine changes in water of Ebony Lake through bioremediation procces by Salvinia molesta and Pistia stratiotes. The main parameters were COD, ammonia, nitrite, nitrate, sulfide, orthophosphate, and turbidity. Based on the results of the study, it was found that a decline in the value of COD, ammonia, nitrite, nitrate, orthophosphate, sulfide, and turbidity. However, the decrease was not different in the control treatment. This is presumably due to other factors, namely bacteria or microorganisms that decompose organic matter. Decomposition results in the form of inorganic nutrients and water used by plant for growth. This is evident from the increased extent of the closure and the water plant biomass.
Keyword: Salvinia molesta, Pistia stratiotes, water quality, organic material, bioremediation

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