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All Journal Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan METANA Jurnal Sains & Teknologi Lingkungan Journal of Environment and Sustainability Jurnal Pasopati : Pengabdian Masyarakat dan Inovasi Pengembangan Teknologi IJEE (International Journal of Engineering Education) Waste Handling and Environmental Monitoring
Wiharyanto Oktiawan
Environmental Engineering Department Diponegoro University
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering

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PENGOLAHAN AIR LINDI DENGAN PROSES KOMBINASI BIOFILTER ANAEROB-AEROB DAN WETLAND Hadiwidodo, Mochtar; Oktiawan, Wiharyanto
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 9, No 2 (2012): Vol 9, No 2 (2012)
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (559.932 KB) | DOI: 10.14710/presipitasi.v9i2.84-95

Abstract

In Indonesia leachate is still an issue yet to be addressed. With a high content of pollutant parameters and lack of government support resulting landfill must think about the appropriate treatment to be safe for treating waste when discarded into the environment. Biofilter methods and wetland is the one of alternatives leachate treatment that can be used. This method does not require a large operating costs and does not require skilled professionals to operate it. With a combination of wetland and biofilter, it is expected to reduce the content of pollutants in  the leachate, so it can be meet the wastewater quality standards which set by the government. The levels of pollutants were tested in this study is the BOD5, COD, TSS, ammonia, nitrite and nitrate.
OPTIMALISASI INSTALASI PENGOLAHAN LUMPUR TINJA DENGAN PENGOMPOSAN LUMPUR TINJA (Studi Kasus IPLT SEMARANG) Oktiawan, Wiharyanto; Priyambada, Ika Bagus
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 3, No 2 (2007): Vol 3, No 2 (2007)
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (964.002 KB) | DOI: 10.14710/presipitasi.v3i2.53-57

Abstract

Semarang Septage  Treatment  Facillty  is a septage manufacture which serves Semarang  Clty distrik. At this moment,  the facility  is disfunction  because  the septage pile up in the anaerobic pond.  Because  of that, Semanng Septage Treatment  Facility  has to be evaluated  which  is consisf of technical, infrastructure and management evaluations. As the resulfs of  the evaluation, the new anaerobic pond is recomended in 2007, so as the new sludge drying bed in 2005 and 2010.  The septage of Semarang Septage Treatment Facility  is very huge that is about 3m3/day.  The solution that can be taken is composting. The septage is fulfill the compost characteristic after it was dried in 30 days. The management of septage composting are consist of transporation, sifterization, weighing and packaging, and also transportation and storage. Thte price of compos product is Rp. 440,00/kg in 2005 and it will rise to 707,00 in 2014. it is relatively cheap if it is compared with the prices of another fertilizers, so it is proper to sold in the market.
Detail Desain Sistem Penyediaan Air Bersih Menggunakan Sumber Mata Air (Studi Kasus DAS Citarik, Kecamatan Cimanggung, Kabupaten Sumedang Nugeraha, Winardi Dwi; Oktiawan, Wiharyanto
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 4, No 1 (2008): Vol 4, No 1 (2008)
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3485.08 KB) | DOI: 10.14710/presipitasi.v4i1.85-91

Abstract

Water is one of the fundamental nedds of human being, but not everyone could easly access it. At kecamatan Cimanggung, Kabupaten Sumedang there are a few spring water that could be used, but there is no sufficient clean water supply system available. this has caused the people at the area found difficulties to obtain clean water.
PENGGUNAAN BIOCATALYS ELECTROLYSIS DALAM PENURUNAN KONSENTRASI TOTAL SUSPENDED SOLID (TSS) DAN CHEMICAL OXYGEN DEMAND (COD) LIMBAH DOMESTIK Oktiawan, Wiharyanto; Hadiwidodo, Mochtar; Purwono, Purwono
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 13, No 2 (2016): September 2016
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (225.443 KB) | DOI: 10.14710/presipitasi.v13i2.81-87

Abstract

Secara umum air limbah kegiatan rumah tangga (domestik) dibuang langsung menuju badan air seperti sungai dan danau. Pengolahan limbah cair secara biologis (aerob) sering menghasilkan lumpur dalam jumlah besar. Jumlah lumpur dapat dikurangi dengan pengolahan anaerob. Sistem bioelektrokimia merupakan salah satu terobosan teknologi yang memungkinkan untuk mengolah limbah sekaligus menghasilkan energi berupa gas metana. Penggunaan biocatalys electrolysis dapat mengatasi kelemahan proses anaerob secara konvensional dalam penurunan konsentrasi TSS dan COD limbah domestik salah satunya mampu menghasilkan gas H2 dari proses elektrolisis. Penambahan daya ekternal sebesar 6 volt mampu menyisihkan TSS sampai kadar 82 mg/l dari kadar semula 157 mg/l. Tegangan 12 volt mampu menurunkan kadar COD sampai 47,46 mg/l dari kadar awal 223 mg/l. Penyisihan TSS paling rendah pada waktu elektrolisis 15 menit dengan kadar 87 mg/l. Penambahan waktu elektrolisis sebanding dengan penurunan konsentrasi COD limbah domestik. Pada penelitian ini kualitas maupun kuantitas gas metana tidak diketahui secara jelas. Selain gas metan, produk fermentasi juga belum diketahui.
EFEKTIFITAS PENURUNAN Fe 2+ DENGAN UNIT SARINGAN PASIR CEPAT MEDIA PASIR AKTIF Oktiawan, Wiharyanto; Krisbiantoro, Krisbiantoro
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 2, No 1 (2007): Vol 2, No 1 (2007)
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (182.584 KB) | DOI: 10.14710/presipitasi.v2i1.56-59

Abstract

The process that happened in decreasing Fe2+ with a rapid sand filter are mechanical straining, sedimentation, adsorbs and an activities of chemical in the water it self. This research uses 2 stages in testing; they are the batch filter and the column filter. On each of the stages we try using activated sand media. This media is known to able to decrease the Fe2+. The water spring is from the 2nd deep well at the Prambanan water treatment facility. The goal from this research is to find the criteria design on surface loading and to find out the effectiveness in reducing Fe2+ that is in the water by using the media of activated sand. From this experiment we found that the maximal filtration speed on activated sand is 12, 85 m/jam. Calculation analysis shows that the removal  coefficient  of  Fe2+  in  the  batch activated  sand  filter  is  λ 1   =  0,92  ±  0,16  m-1  with  the average on reducing Fe2+ 42,27%.
STUDI PENURUNAN Fe2+ DENGAN UNIT SARINGAN PASIR CEPAT MEDIA PASIR LAUT Oktiawan, Wiharyanto; Krisbiantoro, Krisbiantoro
METANA Vol 4, No 1 (2007): Juni 2007
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4184.782 KB) | DOI: 10.14710/metana.v4i1.1722

Abstract

Abstract Iron is mineral that cause staining of plumbing fixtures  and laundered clothes as wall as produce distinct taste and odors in a drinking water. Aeration is alternative processes for the removal of iron. Sedimentation and filtration will remove the iron precipitates formed in the aeration device. This research uses 2 stages in testing; they are the batch filter and the column filter. On each of the stages we try using activated  sand media. This media is known to able to decrease the Fe2+.The water  spring is from the 2nd deep well at the Prambanan water treatment facility. The goal from this research is to find the criteria design on surface loading and to find out the effectiveness in reducing Fe2+ that is in the water by using the media of activated sand. From this experiment we found that the maximal filtration speed on activated  sand is 11,05 m/hour. Calculation analysis shows that the coefficient. Figure of Fe2+ in the batch filter on Ngrenehan beach ocean sand filter is λ1=0,40± 0, l0 m -1 with the average on reducing Fe2+ 21,37%. This figure is small if it is compare to the coefficient figure of Fe2+ in the batch activated sand filter is λ1=0,92± 0, l6 m -1  with the average on reducing Fe2+ 42,27%. Keywords : Ngrenehan beach ocean sand filte, rapid sand filter. Activated sand, filtration speed. removal coefficient
Tingkat Korosifitas Air Permukaan Hilir Rawa Pening pada Musim Kemarau dan Penghujan Purwono, Purwono; Oktiawan, Wiharyanto; Istirokhatun, Titik; Nurfaiz, Agus
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 17, No 3 (2020): November 2020
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (764.763 KB) | DOI: 10.14710/presipitasi.v17i3.215-222

Abstract

Corrosion is an important factor that can affect the quality of air used by humans. This has an impact on health and economic factors, damage to air distribution equipment. The level of corrosivity of surface water as raw water for drinking water is important to be examined before the water enters the processing process or other uses such as hydroelectric power (PLTA). This study aims to measure the level of water corrosivity on the surface of the Pening swamp during the dry and rainy seasons in 2018. Taking air samples on the surface of the Pening swamp, then carrying out laboratory tests on the parameters of air corrosivity. The results showed that the downstream surface of the Pening swamp was not corrosive in terms of pH, temperature, TDS, and chloride parameters. The pH value in the dry season (J1) is 7.00, while in the rainy (J2) it is 7.77 and is non-corrosive. The temperature values are 28.6oC and 29.3oC in the rainy and dry seasons, respectively. The TDS measurement results in the dry season are lower than the rainy season by a difference of 12 mg / l. In the dry season it is 141 mg / l and the rainy season is 153 mg / l. This increase probably came from geological material (geological material) such as rocks and soil around the Pening Swamp Lake. Other sources of TDS include urban land, road workers, agricultural land and pasture. Human activities also increase in the increase of TDS in water including domestic activities (bathing and washing), trade, and industry. Chloride levels were 2.19 mg / l and 3.19 mg / l. This research has implications for the users of Sungai Pening Swamp. The corrosivity of air measurement is also by microbiological parameters which need to be investigated further.
PENENTUAN SURFACE LOADING RATE (Vo) DAN WAKTU DETENSI (td) AIR BAKU AIR MINUM SUNGAI KREO DALAM PERENCANAAN PRASEDIMENTASI DAN SEDIMENTASI HR-WTP JATIBARANG Ahmad Iman Tauhid; Wiharyanto Oktiawan; Ganjar Samudro
Jurnal Sains & Teknologi Lingkungan Vol. 10 No. 2 (2018): SAINS & TEKNOLOGI LINGKUNGAN
Publisher : Teknik Lingkungan Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/jstl.vol10.iss2.art1

Abstract

Umumnya dalam pengolahan air, proses pemisahan padatan terjadi dalam bentuk pengendapan pa rtikel diskrit (prasedimentasi atau grit chamber) dan pengendapan flokulan (sedimentasi). Sebelum melakukan perencanaan untuk mengolah air sungai Kreo, diperlukan analisa kecepatan pengendapan sebagai dasar kriteria desain yang akan digunakan dalam perencanaan bak prasedimentasi dan sedimentasi. Air sungai diambil sesuai dengan SNI 6989.57:5008 pada titik kordinat X = 429320, Y = 9222982, dalam zona 49 M. Sebelum melakukan analisa pengendapan, dilakukan Jar test untuk mengetahui dosis koagulan yang optimum. Didapatkan dosis koagulan yang optimum sebesar 20 mg/L. Hasil analisis didapatkan bahwa, dengan overflow rate sebesar 2,769 m/h, bak prasedimentasi dapat mengendapkan partikel dengan ukuran 0,0315 mm atau lebih besar. Untuk mencapai efisiensi 70% dalam pengolahan sedimentasi, maka dibutuhkan overflow rate (Vo) sebesar 1,3 m/h. 
EDUKASI PELINDUNGAN LAPISAN OZON MELALUI IDENTIFIKASI ALIRAN MASSA REFRIGERANT DAN BAHAN PENDINGIN DI KOTA SURAKARTA Bimastyaji Surya Ramadan; Nurandani Hardyanti; Titik Istirokhatun; Winardi Dwi Nugraha; Wiharyanto Oktiawan
Jurnal Pasopati : Pengabdian Masyarakat dan Inovasi Pengembangan Teknologi Vol 3, No 1 (2021)
Publisher : Fakultas Teknik Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Pengabdian masyarakat ini bermitra dengan Dinas Lingkungan Hidup Kota Surakarta untuk mengidentifikasi aliran massa bahan pendingin di Kota Surakarta. Tujuan dari kegiatan ini adalah untuk mengindentifikasi bahan pendingin di Kota Surakarta. Bahan pendingin berpotensi memberikan kontribusi terhadap gas rumah kaca sehingga pengetahuan mengenaik aliran massa sangat diperlukan untuk edukasi lanjutan terkait. Pengambilan sampel dilakukan pada penyedia jasa bengkel/servis AC, distributor, penjual bahan kimia dan para pengguna, terutama dari sektor non domestik. Kegiatan ini dibatasi pada inventarisasi kegiatan yang berpotensi menggunakan bahan perusak ozon, utamanyya dari massa refrigerant yang digunakan secara umum. Dari hasil survei yang telah dilakukan, dapat diketahui bahwa refrigeran yang paling banyak ditemukan di Kota Surakarta adalah R-22 dan yang paling rendah adalah MC-22 dimana bahan tersebut digunakan sebagai bahan pendingin pada AC ruangan, lemari pendingin, freezer, ixe cube dan cold roomKata kunci : bahan pendingin, refrigeran, distributor AC, Surakarta
Enhancement Student Understanding Through The Development Of Lab Module Based On Constructivistic Wiharyanto Oktiawan; Mochtar Hadiwodo; Purwono Purwono
International Journal of Engineering Education Vol 1, No 1 (2019)
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (676.789 KB) | DOI: 10.14710/ijee.1.1.41-45

Abstract

Experimental focuses learning on developing the skills of student in the process of knowledge, discover and develop their own fact, concept, and values required. The way to make it is by doing  modification to the practical guidance module had been given. Nowadays, practical guidance tend to emphasize on the explanation, so its use both practical and follow the path that has been presented. The practical guidance module should be modified based on constructivism. The module is an experimental guidance to environmental laboratory subject. The test material consists of water and wastewater sample with parameter of chemical oxygen demand (COD), total dissolved solid (TDS), and nitrate. The results showed progress in the cognitive aspects such students' ability to predict the concentration of COD sample. The greater COD concentration of wastewater make the color of mixture is blue-green. The student could communicate the calibration curves correctly. Hypothesis skills presented at TDS testing. The greater of the sediment, the greater the concentration of its. The same thing happened on COD testing, COD levels can be estimated earlier. The skills show an increasing such as the skill to ask questions, experiment planning skills, skills in using tools/materials, accuracy in data retrieval, seriousness and cooperation in conducting the experiment.
Co-Authors Ahmad Iman Tauhid Ainurrofiq, Mohammad Naffah Anik Sarminingsih, Anik Damayanti, Poerborini Endro Sutrisno Fadhila Raziani Ganjar Samudro Ganjar Samudro Ika Bagus Priyambada Junaidi Junaidi Junaidi Junaidi Komang Dewi Novianti Krisbiantoro Krisbiantoro Mahfud Afandi, Mahfud Marsyea, Rihlah Fahiranti Mochtar Hadiwidodo Mochtar Hadiwodo Moh. Djaeni Nurandani Hardyanti Nurfaiz, Agus Priska Septiana Putri Purwono Purwono Purwono Purwono, Purwono Ramadan, Bimastyaji Surya Ratih Puspa Endah Suprapto, Ratih Puspa Endah Setia Amalia Sudarno Utomo Titik Istirokhatun Ulfatul Fuadah, Ulfatul Wijanarka Wijanarka Winardi Dwi Nugeraha, Winardi Dwi Winardi Dwi Nugraha ZAMAN, Badrus