VARIASI WAKTU ELEKTROLISIS MENGGUNAKAN ELEKTRODA ALUMUNIUM UNTUK MENURUNKAN COD LIMBAH “BATIK AYU” DI PIJENAN, WIJIREJO, PANDAK, BANTUL

The development of batik indutry gives both positive and negative impacts on people life. One of the negative effects is the waste yielded from the production process which is potential to pollute the environment. The results of preliminary survey show that the COD examination of the sewage of “Batik Ayu” industry, which is located in Pijenan, Wijirejo, Pandak, Bantul, at the outlet was 570 mg/L, meaning that the waste still exceeding the threshold regulated by the Decree of Governor of DIY No. 7 in 2010. The purpose of this research was to know the effect of electrolysis time using aluminium electrodes on COD reduction of that industry waste, by conducting an experiment with pre-test post-test with control group design. The waste water sample for this study were obtained by using time combination method and with quota sampling technique. There were three electrolysis times used, i.e. 1 hour, 2 hour and 3 hour, which were measured in 10 replications. The results of data analysis with using one way anova from SPSS for Windows at 0,05 level of signifcance, indicate that the COD reductions produced from the treatment groups and control group were not different. However, if compared individually, the COD reduction of each electrolysis time is higher than that of the control group

Efektifitas Jumlah Pasangan Elektroda Aluminium pada Proses Elektrokoagulasi terhadap Penurunan Kadar Fosfat Limbah Cair Laundry

Since one of the detergent-forming chemicals is phosphate, laundry wastewater contains this substance. In general, laundry businesses do not have waste treatment facilities, while high level of phosphate which is accumulated continuously in waters may lead to eutrophication that disrupting aquatic ecosystems and causing river sedimentation. One of the methods to decrease phosphate level from laundry wastewater is electrocoagulation, with aluminum plate as the electrode.The research was a true experiment and was aimed to know the decrease of phosphate levels in laundry wastewater yielded from “Rumah Laundry” located at Pajimatan, Imogiri, Bantu, after treated by electrocoagulation process with 3 pairs, 4 pairs and 5 pairs of aluminum electrode. The design of the research was pre-test post-test with control group in five times replications, on randomly selected treatment and control groups. The statistical test with paired t-test shows that the electrocoagulation process is able to reduce the phosphate levels in laundry waste water compared with those of the control (p-value 0,05)

DETERMINATION OF TRACE NITRITE AS 4-(4-NITROBENZENAZO)- 1-AMINONAPHTHALENE COMPLEX BY EXTRACTION-SPECTROPHOTOMETRY

A study of extraction-spectrophotometric method for the determination of trace nitrite as 4-(4-nitrobenzenazo)- 1-aminonaphthalene complex using n-amylalcohol and chloroform as organic solvents has been done. Results of the study showed that extraction-spectrophotometric determination of nitrite using n-amylalcohol or chloroform was very sensitive and had low limit of detection. Extraction-spectrophotometric method of nitrite using n-amylalcohol gave range of linear concentration 0.000-0.054 mg/L NO2-N, detection limit of 2.09x10-4 mg/L NO2-N, and sensitivity of 34.514 ± 0.398 absorbance unit per mg/L of NO2--N. Meanwhile, extraction-spectrophotometric of nitrite using chloroform had range of linear concentration of 0.000-0.100 mg/L NO2-N, detection limit of 8.99x10-4 mg/L NO2-N, and sensitivity of 18.353 ± 0.456 absorbance unit per mg/L NO2-N

PEMAANFAATAN LIMBAH JERIGEN MENJADI SAFETY BOX DI RSUD WATES, TAHUN 2016

Solid waste in the form of used jerrycans in Wates Local Public Hospital is comprised of two types, i.e. the 5 L jerrycan which was contained acid liquid and the 10 L jerrycan which was contained bicarbonate fluid. In a month, the number of used jerrycans may reach 300. The change of the jerrycans into safety boxes is one of the innovations to take advantage of the existingjerrycan waste in the hospital. Eventhough those two substances contained in the jerrycan are almost similar with infusion fluid, they are not classified as hazardous waste as long there is no contact with patients. This study was aimed to know the receptivity of respondents, i.e. consisted of 38 nurses and 9 cleaning service officers, toward the safety boxes which made of cardboard and those which made of used jerrycan as well, by conducting a prospective designed survey. The data were analysed by using dependent t-test a

Menjadikan Air Hujan sebagai Berkah yang Bermanfaat

Pada acara kiprah desa ini, kami dari Jurusan Kesehatan Lingkungan Poltekkes Kemenkes Yogyakarta akan sedikit berbagi berkah berkaitan dengan air hujan. Sebagaimana kita ketahui bersama, bulan ini merupakan awal dari musim penghujan. Sudah berkali-kali hujan turun mengguyur kota kita tercinta. Udara lingkungan kita menjadi sejuk, air yang kita butuhkan mulai melimpah, udara yang kita hirup menjadi bersih dari debu dan kontaminan, alam dan tumbuh-tumbuhan pun mulai menghijau. Namun demikian, masih banyak saudara-saudara kita yang kurang menyadari berkah alam dari Sang Pencipta ini, sehingga sesuatu yang mestinya bermanfaat, tetapi malah bisa bikin penat, sesuatu yang seharusnya membawa berkah, tetapi karena salah langkah malah jadi musibah. Lalu bagaimana kita menyikapi musim hujan ini? Bagaimana menjadikan air hujan ini menjadi berkah? Bagaimana sebenarnya kualitas air hujan kita? Apa saja yang bisa kita manfaatkan dari air hujan itu? Sekali lagi, kami hanya sedikit berbagi, karena mungkin banyak di antara para pendengar RRI yang telah memahami

Metode penentuan nitrit sebagai kompleks 4-(4-Nitrobenzenazo)-1-Aminonaftalen secara ekstraksi spektrofotometri dan membran optik berbasis PVC-DO

A study of extraction-spectrophotometric method for the determination of nitrite as 4-(4-nitrobenze nazo)-1-aminonaphthalene complex using n-amylalcohol and chloroform as organic solvents has been done. The result of this study was further developed for the application of liquid polymeric membrane based on polyvinylchloride-dioctylsebacate (PVC-DOS) as optical membrane for the determination of nitrite by spectrophotometry and visual. Results of the study showed that extraction-spectrophotometric determination of nitrite using n -amylalcohol or chloroform was very sensitive and had low limit of detection. Extraction-spectrophotometric method of nitrite using n -amylalcohol gave range of linear concentration of 0.000-0.054 mg/L NO 2 --N, detection limit of 2.09x10-4 mg/L NO 2--N , and sensitivity of 34.514 ± 0.398 absorbance unit per mg/L of NO 2 --N. Meanwhile, extraction-spectrophotometriy of nitrite using chloroform had range of linear concentration of 0.000-0.100 mg/L NO 2 --N, detection limit of 8.99x10-4 mg/L NO 2 --N, and sensitivity of 18.353 ± 0.456 absorbance unit per mg/L NO2 - - N. Statistically, extraction-spectrophotometric and optical membrane methods of nitrite determination did not show any significant different at significance level of 95%. The liquid polymeric membrane can be used as optical membrane for the determination of nitrite. The optical membrane method by spectrophotometry and visual is good for the determination of nitrite at the concentration range of 0.01-0.11 mg/L NO2--N and 0.02-0.60 mg/L NO2 --N, respectively, while at lower concentration of nitrite, extraction-spectrophotometric method may be used either using namylalcohol or chloroform as organic solvent/extractant