Perancangan Sistem Pengolahan Air Limbah Pada Gedung Perkantoran (Studi Kasus: Gedung Perkantoran “MIPA Tower” ITS Surabaya)

Gedung perkantoran MIPA Tower, sebuah gedung bertingkat sebelas, yang terletak di wilayah Institut Teknologi Sepuluh Nopember Surabaya, saat ini masih dalam tahap pembangunan. Gedung tersebut akan digunakan untuk ruang perkantoran, ruang kelas dan laboratorium. Dalam pengoperasian gedung, limbah domestik dan laboratorium akan dihasilkan. Air limbah domestik dan laboratorium mengandung senyawa – senyawa yang dapat mencemari lingkungan. Perancangan sistem pengolahan air limbah domestik dan laboratorium dilaksanakan pada tugas akhir ini. Sistem ini terdiri dari bak netralisasi, grease trap, bak ekualisasi, anaerobic filter, dan filter menggunakan karbon aktif dan pasir silika. Langkah – langkah dalam perancangan ialah (i) mengumpulkan data primer dan sekunder, (ii) menghitung perancangan teknik, (iii) menggambar Detailed Engineering Design (DED), dan (iv) menghitung volume kerja dan rencana anggaran biaya. Kesimpulan dari perancangan ini ialah unit pengolahan akan mengolah campuran air limbah domestik dan laboratorium. Dimensi dari masing – masing unit ialah (i) bak netralisasi (Ø = 0,65 m, H = 0,43 m), (ii) grease trap (4 m x 2 m x 1 m), (iii) bak ekualisasi (10,5 m x 5,5 m x 2,5 m), (iv) tangki septik (4,5 m x 4 m x 2,5 m), (v) anaerobic filter 6 kompartemen (2,25 m x 4 m x 2,5 m) dan (vi) filter dengan tinggi karbon aktif 50 cm, pasir silika 150 cm, gravel 10 cm, dan diameter tangki 1,5 m. Anggaran biaya yang dibutuhkan untuk pembangunan dan operasi unit – unit pengolahan, masing – masing sebesar Rp 743.275.675 dan Rp 4.882.687,99. ================================================================= The MIPA Tower office building, an eleven-storey building, which is located in the area of Sepuluh Nopember Institute of Technology Surabaya, is under construction. The building will be utilized for offices, classrooms, and laboratories. In the operation of the building, domestic and laboratory wastewater will be produced. This wastewater contains compounds that can pollute the environment. A design of domestic and laboratory wastewater treatment system is conducted in this final project. The system comprises of a netralization tank, a grease trap, an equalization tank, an anaerobic filter, and an activated carbon and silica sand filter. The steps of the design are (i) collecting primary data and secondary data, (ii) calculating of engineering design, (iii) drawing the Detailed Engineering Design (DED), and (iv) calculating of bill of quantity and budget. The conclusion of this design is that the treatment plant will treat a mixture of domestic and laboratory wastewater. The dimension of each unit is as follows: (i) the netralization tank (Ø = 0.65 m, H = 0.43 m), (ii) the grease trap (4 m x 2 m x 1 m), (iii) the equalization tank (10.5 m x 5.5 m x 2.5 m), (iv) the septic tank (4.5 m x 4 m x 2.5 m), (v) the six-compartment anaerobic filter (2.25 m x 4 m x 2.5 m), and (vi) the filter with activated carbon (H = 50 cm), silica sand (H = 150 cm), gravel (H = 10 cm), with the diameter of the tank is 1.5 m. The cost budget required for the construction and operation of processing units, amounting to Rp 743,275,675 and Rp 4,882,687.99, respectively