Judul: Utilization of PT. Krakatau Tirta Industri water treatment plant sludge as compost raw materials
Abstrak: The process of making capsule package produces waste in form of mud which has to be disposed periodically. The mud contains such elements as Ca, N and P that are useful for plants. This study was aimed to utilize the mud as a mixture of compost media for caisin plant (Brassica rapa L). The research used a completely randomized design with Advanced Duncan Test at a level of a = 5%. The waste (L) doses used were 0 g, 250 g, 500 g and 750 g, and the compost (L) doses were 0 g, 250 g, and 500 g. The addition of compost in this research could improve the physical properties of soil, making it not too tough to be able to bind water and nutrients. The research result showed that the mud had a significant effect on vegetative growth such as the height of plants, the width of leaves, and the number of leaves. Treatments K3L2 (K 500 g + L 250 g), K2L4 (K 250 g + L 750 g), and K2L3 (K 250 g + L 500 g) indicated very good results, while treatment K1L1 (without the addition of compost and waste) showed unsatisfactory results, with each treatment having a value of 22.65 cm, 7.86 cm and 7.67 leaves.
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Judul: Pemanfaatan limbah lumpur water treatment plant PT. Krakatau Tirta Industri sebagai bahan baku kompos, Utilization of PT. Krakatau Tirta Industri water treatment plant sludge as compost raw materials
Abstrak: Limbah lumpur atau sludge merupakan sisa hasil proses sedimentasi yang mengendap di dasar unit kolam clarifier. Sludge yang kemudian terkumpul dalam kolam penampung lumpur ini dapat dibuang dengan menggunakan beberapa metode pengolahan. Pengomposan merupakan salah satu metode alternatif dalam pengolahan sludge. Penelitian ini bertujuan untuk memanfaatkan sludge yang berasal dari Water Treatment Plant (WTP) milik PT. Krakatau Tirta Industri (PT. KTI) menjadi kompos dan menganalisa kandungan kompos, kemudian membandingkannya dengan standar mutu kompos menurut SNI 19-7030-2004. Peralatan yang digunakan dalam penelitian ini adalah timbangan gantung pegas, termometer alkohol, pipa pvc, spidol, wadah tempat pengomposan (box kompos), terpal plastik, alat penyiram air, dan plastik. Bahan yang digunakan adalah lumpur sisa pengolahan air WTP milik PT. KTI, jerami, bakteri dekomposer dan kotoran kambing. Penelitian ini dibagi menjadi 3 tahap, yaitu analisis lumpur dan bahan baku kompos, pengomposan, dan analisis kompos. Analisis bahan baku kompos yang terdiri dari jerami, kotoran kambing, dan lumpur dilakukan di laboratorium Balai Penelitian Tanah Indonesia untuk diketahui nilai beberapa parameter seperti pH, kadar air, kandungan organik dan anorganik-nya. Pengomposan menggunakan 2 jenis aktivator, yaitu penggunaan kotoran kambing untuk box 1 dan penggunaan bakteri dekomposer untuk box 2. Perbandingan pada box 1 antara jerami, kotoran kambing, dan lumpur adalah 100 kg:100kg:100kg, sedangkan perbandingan pada box 2 antara jerami, bakteri, dan lumpur adalah 100 kg: 100kg(ml): 90 kg.
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Judul: Penentuan Nilai Eigen dan Vektor Eigen dari Matriks Tridiagonal 2-Toeplitz dengan Pendekatan Polinomial Chebyshev
Abstrak: The eigenvalues and eigenvectors of a matrix can be determined by finding its characteristic polynomials. The characteristic polynomials of a tridiagonal 2-Toeplitz matrix is shown to be closely connected to polynomials which satisfy the Chebyshev recurrence relationship. If the order of the matrix is odd, then the eigenvalues are found explicitly in terms of the Chebyshev zeros and the eigenvectors are found in terms of the polynomials satisfying the recurrence relationship. For even ordered matrices, the situation is more complicated. The problem in these cases is that although the Chebyshev recurrence formula is still applied, its initial values are not generating Chebyshev polynomials
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