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METANA

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Published by Universitas Diponegoro

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Articles 7 Documents

Search results for , issue "Vol 4, No 1 (2007): Juni 2007" : 7 Documents clear

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

Abstract Iron is mineral that cause staining of plumbing fixtures Â 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 Â sand media. This media is known to able to decrease the Fe2+.The water Â 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 Â 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 Î»1=0,40Â± 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 Î»1=0,92Â± 0, l6 m -1 Â with the average on reducing Fe2+ 42,27%. Keywords : Ngrenehan beach ocean sand filte, rapid sand filter. Activated sand, filtration speed. removal coefficient

BIODIESEL DENGAN ALTERNATIF BAHAN BAKU MINYAK NABATI BARU DAN BEKAS Kusumayanti, Heny; Puspitasari, Nurul
METANA Vol 4, No 1 (2007): Juni 2007
Publisher : Universitas Diponegoro

Abstract Biodiesel represent one of substance of alternative of fuel substitution which can be innovated and friendly environmentally. This Biodiesel earn also made plainly Â and Â exploit the existing substance around. Price from raw material its maker also cheap enough. The example by using new vegetation oil and ex-vegetation oil. Process of with the process transesterifikasi, that is dissolve the oil by NaOH and methanol. Later then mingled and yield two coat after hushed 8 clock that is flake is biodiesel and substratum is gliserol. Examination conducted by experience is combustion by using tinder and with the iron rasher Keywords : biodiesel, oil

PENGARUH KANDUNGAN SULFAT TERHADAP KUAT TEKAN BETON Purba, Parhimpunan
METANA Vol 4, No 1 (2007): Juni 2007
Publisher : Universitas Diponegoro

Abstract Â Compressive strength is one of the important mechanical characteristic that it can indicates the concrete performance. One of the important material in concrete making is water. Water have .function as mixing material and treatment material. Water may not contain substrat that harm of concrete. This research is intendedÂ to know the influence of sulphate in the water both of as mixing material or treatment material. From this research indicates that the sulphate ion in the water most influence to concrete pressure strength. Â Key word : Compressive strength, concrete, sulphate, water cement ratio, treatment

STUDI AWAL REKAYASA PROSES PRODUKSI TEH HIJAU BERKATEKIN TINGGI MELALUI TEKNOLOGI STEAMING Yulianto, Mohammad Endy; Senen, Senen; Ariwibowo, Didik
METANA Vol 4, No 1 (2007): Juni 2007
Publisher : Universitas Diponegoro

Abstract Tea is a nalural healty, beverage because of catechin content which is a bioactive matter that can retard cancel growth, heart desease, blood and nerves, making healthy for mouth, teeth and some other infection. Therefore, high catechin in tea would be needed. To Obtain high catechin contend it must eliminate enzymatically oxidation process of polyphenol during tea manufacturing. Thus, it was created a process and processing system which sustain the process. The basic design was inactivation of polyphenol oxidase enzyme by steaming. It wishes a high catechin green tea product that can either be directly as a beverage or as a catechin powder for dietary food and functional food or medicine. The variables of this study, were percentage of steam, tea leaves feeding and humidity. The investigated parameters were temperature, catechin content, moisture content, and humidity as time function. The result was that at 900C yielded high catechin. The study shows that at 70%Â humidityÂ yielded higher catechin and lower moisture content. Â Keywords : Green tea; Steaming

SENYAWA BARU PASCA KEBAKARAN PENYEBAB RAPUHNYA BETON BERTULANG Lukman, Lukman
METANA Vol 4, No 1 (2007): Juni 2007
Publisher : Universitas Diponegoro

Abstract Fire can be happened everywhere at anytime, including to building which use reinforced concrete construction. As consequense of the fire. a heating and cooling cycle by turns happen which cause complex fisis and chemical phase chenge. Considering that concrete has teracity againts high temperature without having chemical compound coposition change because of the high Â silica, which is until 1000 Â EC ofÂ temperature Â Keyword The Â concrete after fire

PENYISIHAN KONSENTRASI TIMBAL (Pb) MENGGUNAKAN ADSORBENT ABU ENDAPAN BATU BARA (STUDI KASUS : AIR LIMBAH INDUSTRI PERCETAKAN SEMARANG) Hardyanti, Nurandani; Syafrudin, Syafrudin
METANA Vol 4, No 1 (2007): Juni 2007
Publisher : Universitas Diponegoro

Abstract Offset industries produced waste water contained lead contaminant and had pollution potential for environment. One of method to remove waste water contained lead was used bottom ash as adsorbent. This research was to know the ability of Â bottom ash to reduce lead in artificial waste water with concentration of lead was 20.64 mg/l in the batch and continuous processes. For the batch processes, bottom ash was used as independent variable of 0, 1, 3, 5, and 7 weight gram and highest removal efficiency up to 72.09-90.84%. While in continuous process experimental used column with diameter of 2 inch, discharge of 760 ml/minute, and influent concentration of 15 mg/l, 20mg/1, and 25 mg/l. Highest efficiency of removing lead was 73%-92.93%. With velocity constanst was 0.416-0.490 ml/mg. Second while operational capacity was 0.069-0.081 mg/g. Keywords:offset, adsorption, waste water, lead, coal bottom ash

STUDI POTENSI EKONOMI PEMANFAATAN LIMBAH INDUSTRI TEKSTIL PRINTING SEBAGAI BAHAN BAKAR ALTERNATIF (STUDI KASUS: PT. SEKAR BENGAWAN, KARANGANYAR) Badrus Zaman; M. Arief Budihardjo
METANA Vol 4, No 1 (2007): Juni 2007
Publisher : Universitas Diponegoro

Abstract PT. Sekar Bengawan in Karanganyar Regency. Central Java is a printing textile industry which produces 1,25 m3 of kerosene waste per day. Based on technical test, the characteristic of the kerosene waste are as follows, 42,772 MJ/kg of calorific value, 0, 08359 mg/m3 of SO2 emision, and 0,13518 mg/m3 of NO2 emision. The kerosene waste can be used as fuel with the ratio of time length, volume of soot, and weight of soot is 1,72 ; 1,6 ; and 3,1 times bigger than kerosene. Based on exposure assesment of SO2 and of NO2, Hazard index value for adult woman is 0,412; adult man is 0,272 ; child 6-12 years is 0,27;. and child 2-6 years is 0.2725. With hazard index less than one, so kerosene waste will not generate health impact. Based on these data, kerosene waste can be reused and resold to the market. The target market segments are households and street vendors. Kerosene waste which is priced Rp ll75/liters will generate Rp.22.643.437,5 per month of profit compared with Rp.50.625.000 per month of cost if it is treated an hazardous waste treatment. Key word : Waste kerosene, Hazard Index, Reuse, Economic potency

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