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Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan

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Published by Universitas Diponegoro

ISSN : 1907817X EISSN : 25500023 DOI : -

Core Subject : Science, Agriculture,

Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences

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Articles 600 Documents

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STEM-Blended Learning Regarding Earthquake Disaster: Prospective Teachers Perception Didit Ardianto; Bibin Rubini; Indarini Dwi Pursitasari; Indriyani Rachman
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 18, No 3 (2021): November 2021
Publisher : Universitas Diponegoro

This study aims to determine student teacher perceptions of the implementation of STEM-Blended learning. The subjects involved in this study consisted of 25 4th semester students in the elementary school teacher program. The instruments used include closed questionnaires and open questionnaires. The results showed that students gave a positive attitude towards scientific and engineering practices in the lecture process. In addition, they are also very motivated to create a prototype design that integrates STEM

Analysis of Occupational Noise in Association with Blood Pressure Among Workers at Geothermal Power Plant Muhyidin Muhyidin; Sjahrul Meizar Nasri
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 18, No 3 (2021): November 2021
Publisher : Universitas Diponegoro

The purpose of this study will analyze noise intensity at a geothermal power plant and its association with employees’ blood pressure and risk of hypertension. A cross-sectional survey using questionnaire as primary data; noise dosimeter, body mass index and blood pressure measurement records as secondary data. Total 101 workers participated by purposive sampling based on a similar exposure group (SEG). Mann-Whitney & χ2 test analysis was applied to examine the association of dependent variables and independent variables. Noise intensity was measured from the noise dose result during 8 working hours. Subjects with noise dose >80 dBA had higher levels of SBP / systolic blood pressure (119.1±11.2 mmHg) and DBP / diastolic blood pressure (75.6±5.3) than subjects with noise dose ≤80 dBA (SBP: 117.9±6.6 mmHg, DBP: 75.0±5.1). The hypertension prevalence was 7.9% at participants with noise dose >80 dBA and 2.6% in noise dose ≤80 dBA. The odds ratio (OR) of noise dose >80 dBA (OR = 3.190, 95% CI = 0.358-28.394), and smoking (OR = 2.469, 95% CI = 0.416-14.645). Noise intensity was not associated with SBP (p-value = 0.664), DBP (p-value = 0.538), and hypertension (p-value = 0.405). This study was the pioneer in the geothermal industry with noise dosimetry measurement. Further comprehensive studies need to be conducted to confirm the association between noise intensity and blood pressure and the risk of hypertension.

Planning for Small-Scale Business (USK) Batik Wastewater Treatment Plant X Yogyakarta Intan Rahmalia; Farhan Muhammad Hilmi; Iva Yenis Septiariva; Reifaldy Tsany Betta Aryanto; Sri Dewi Handayani; Yesaya Emeraldy Priutama; Ariyanti Sarwono; I Wayan Koko Suryawan
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 18, No 3 (2021): November 2021
Publisher : Universitas Diponegoro

Small scale business / Usaha Skala Kecil (USK) X currently does not have a batik wastewater treatment unit. This condition causes the possibility of contamination to water bodies. USK X wastewater treatment applications' planning needs to be carried out sustainably, namely by reusing water. The process units needed in this planning are the sequencing batch reactor (SBR) and constructed wetlands. The effluent of textile wastewater with this system for parameters BOD, COD, TSS, sulfide, total oil & fat, and color were 0.13 mg/L; 106.5 mg/L; 2.4 mg/L; 0.036 mg/L; 0.07 mg/L; and 90.67 PtCo, respectively. The dimensions of the SBR unit required are 0.75 x 0.6 x 1 m. Modification of the SBR unit uses an ozone generator to produce ozone gas which functions as oxidation of organic pollutants and colors in batik waste. After processing in the SBR unit, it is carried out using a constructed wetland with 2.56 m2.

The Effect of Manganese Greensand Addition on Tray Aerator to Reduce COD Levels of Laundry’s Wastewater Naufal Adi Nugroho; Sulistiyani Sulistiyani; Nikie Astorina Yunita Dewanti
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 18, No 3 (2021): November 2021
Publisher : Universitas Diponegoro

COD level of Pojok Laundry’s wastewater did not meet the quality standard regulated in the Special Region of Yogyakarta Regulation No. 7 of 2016 (>150 mg/l) which was 442.5mg/l. This study was aimed to decrease COD levels using the tray aerator method. Manganese greensand with a diameter of 0.25 mm and a thickness of 2.4 cm/tray was also added. This type of research was a quasi-experimental with Nonequivalent Control Group Design. The sample in this study amounted to 50 samples with 5 treatments (30, 45, 60, 75, and 90 minutes), and 5 repetitions. Samples were taken from the washing machine outlet pipe. There were two groups, where the control group was only given aeration and the treatment group was given aeration with the addition of manganese greensand. Data analysis using the two-way ANOVA test showed that there was an effect of time variations on the decrease in COD levels (p<0.05), there was a difference in the average of decreased levels of COD between the control and treatment groups (p<0.05). The average decrease in COD levels after treatment with a time of 30, 45, 60, 75, and 90 minutes, respectively, was 195.7 mg/l (28.80%); 299.0 mg/l (43.63%); 372.1 mg/l (54.79%); 438.3 mg/l (64.61%); and 513.8 mg/l (75.45%). The decrease in COD levels increased with time. The conclusion of this research was that tray aerator with manganese greensand addition can reduce COD levels with the highest reduction up to 76.69% (90 minutes treatment, detergent usage: 30 g).

Preliminary Study of Actinomycetes as Potential Biocatalyst in Biodiesel Production Through Microbial Lipase Activity Aidha Zulaika; Sari Sekar Ningrum; Dody Guntama
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 18, No 3 (2021): November 2021
Publisher : Universitas Diponegoro

Biocatalysts are biological substances that act as an accelerator of chemical reactions without causing influence on the living organism chemically. Biocatalysts based on renewable sources, biodegradable, tolerance to pH and temperature, and high selectivity to stereochemistry substrates and products. The utilization of biocatalyst is environmentally friendly and effective in production costs. This research aimed to determine the potential of actinomycetes as a biocatalyst in biodiesel production. This research method isolation and identification of actinomycetes isolates, conducting lipase activity test to determining lipase enzyme production of actinomycetes isolates. The data analysis in microbial identification was conducted by molecular identification by Gene bank through Basic Local Alignment Search Tool (BLAST). The lipase activity of actinomycetes analyzing by the value of lipase rate of test microbes. Based on chemical analysis of lipase activity, this research results show that actinomycetes T1A has the highest lipase activity by 14.4640 mU/g. Based on molecular identification analysis, actinomycetes T1A was identified as Streptomyces sp., 99% similar to Streptomyces phaeochromogenes.

The Effectiveness of Variations in Contact Time and Density of Water Hyacinth Plants in Reducing COD Level in Tofu Industrial Wastewater Wahyu Rizki Nur Cahyani; Tri Joko; Nikie Astorina Yunita Dewanti
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 18, No 3 (2021): November 2021
Publisher : Universitas Diponegoro

Tofu industry X is one of 24 tofu industries in Bandungan, producing wastewater with a high organic matter content of 600 liters per day. The industry does not have a waste treatment plant and is directly discharged into water bodies, leading to environmental pollution. The phytoremediation method uses water hyacinth plants to be inexpensive and efficient. This study aims to see the effectiveness of water hyacinth plants in reducing COD levels in tofu wastewater. The method used quasi-experimental with a pretest-posttest control group design. The independent variables were contact time (2 and 4 days) and water hyacinth plant density (2 individuals/m2, 4 individuals/m2, and 6 individuals/m2), for the dependent variable was a decrease in COD levels tofu wastewater. 39 samples were tested and analyzed by the Kruskal Wallis test. The results showed the effectiveness of reducing COD levels by 78.68% (2 days) and 80.15% (4 days) for a density of 2 individuals/m2, 80.56% (2 days) and 86.58% (4 days) for density of 4 individuals/m2, and 83.79% (2 days) and 87.33% (4 days) for a density of 6 individuals/m2. It can be concluded that water hyacinth plants efficiently reduce COD of tofu wastewater but have not been effective in reducing COD to quality standards. There is a significant difference in reducing the COD levels of tofu wastewater using the treatment methods.

The Use of Lumbricus Rubellus Earthworm Effect in Composting Process of Musa Paradisiaca L. Peel Waste Vely Kukinul Siswanto; Vivin Setiani; Ayu Nindyapuspa; Ummi Fadlilah Kurniawati; Mutiara Mayang Kamilah
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 18, No 3 (2021): November 2021
Publisher : Universitas Diponegoro

Conventional organic waste composting is one of the processing of organic waste that produces fertilizer. However, the conventional composting process for organic waste lasts 1-3 months. Vermicomposting is composting that lasts a short time, and in addition, vermicomposting produces compost and worms with a high selling value. So, in this study, Musa Paradisiaca L (MPL) peel and sawdust waste were composted using the vermicomposting method into compost. The primary data in this study consisted of monitoring the C/N ratio, temperature, pH, moisture content, texture, the particle size of compost for 3 weeks of the composting process. Testing the analysis of the effect of using Lumbricus Rubellus (LR) earthworms in the composting process of MPL peel waste and sawdust by using LR earthworms. The study results showed that LR worms had no effect on temperature, pH, water content, and C/N ratio during the composting process of MPL peel waste but did affect the texture, particle size, and product of compost weight. pH, moisture content, and temperature of compos with adding LR earthworms and without LR worms was 7, less than 50%, 27-29 0C, respectively. The C/N ratio of compost that uses LR earthworms was 28, while the C/N ratio of composting that uses LR earthworms was 33.

Utilization of Bottom Ash as an Adsorbent for Color and COD Removal for Textile Industry Waste Pricilla Jihan Fadilla; Mohamad Rangga Sururi; Dyah Marganingrum; Mila Dirgawati
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 19, No 1 (2022): March 2022
Publisher : Universitas Diponegoro

This study investigates the use of bottom ash as an adsorbent with and without chemical activation treatment. This study also determines the effect of pH and stirring speed on the efficiency of bottom ash in the adsorption of color and COD. Bottom ash was ground and sieved by 100 mesh sieves and was activated by hydrochloric acid 2%. The experiments were conducted at pH variations of 6, 8, 10; contact time variations of 30, 60, and 90 minutes; and stirring speeds of 30 and 60 rpm. The most effective adsorption by non-activated adsorbents occurred at the combination of pH six and stirring speed of 60 rpm with the removal efficiency for color 66.30% at a contact time of 90 minutes and for COD 31.55% at a contact time of 30 minutes. While for activated adsorbent, the highest removal for color (77.44%) and COD removal (40.54%) were at pH 6, stirring speed 30 rpm, contact time 30 minutes. The bottom ash was potentially used as an adsorbent for treating wastewater containing high concentrations of color and COD.

The Determinant of Environmental Disclosure in ASEAN Countries Indah Fajarini Sri Wahyuningrum; Lisdiana Safitri; Shanty Oktavilia; Andryan Setyadharma
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 19, No 1 (2022): March 2022
Publisher : Universitas Diponegoro

The purpose of this study is to examine the effect of firm size, industry type, profitability, firm age, environmental performance, institutional ownership, and gender diversity on environmental disclosure. The quantity of environmental disclosure is measured using disclosure scoring by giving “1” for items disclosed and “0” for items that are not disclosed. The population used in this study are manufacturing companies listed on the Indonesia Stock Exchange (IDX) and Kuala Lumpur, Stock. Exchange (KLSE) in the year 2019. The sampling technique used was purposive sampling which resulted in 74 companies. The analytical technique used in this research is multiple linear regression analysis using IBM SPSS Statistics version 25. The results of this study indicate that company size, company age, and environmental performance have a significant positive effect on environmental disclosure. The type of industry, profitability, institutional ownership, and gender diversity does not affect environmental disclosure. Based on the study results, it can be concluded that companies that are large in size and mature in age and equipped with ownership of ISO 14001 certification can contribute to making more comprehensive environmental disclosures.

Study of Desiccation Crack Behavior of Fly Ash - Bentonite (FAB) Composite in Landfill Liner System Eflita Yohana; Syafrudin Syafrudin; Mochamad Arief Budihardjo; Bimastyaji Surya Ramadan; Ayudya Izzati Dyah Lantasi; Fadel Iqbal Muhammad; Natasya Ghinna Humaira
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 19, No 1 (2022): March 2022
Publisher : Universitas Diponegoro

The addition of bentonite to fly ash can lower the permeability coefficient of the composite landfill liner. Also, the montmorillonite bentonite can bind quite a lot of water molecules during the hydration process. In this study, the effect of mixture, water content, and salinity on the desiccation cracking phenomenon in the bentonite - fly ash mixture as a landfill liner system was investigated by conducting tests such as desiccation test, water content test, and standard proctor and permeability test. The variation in bentonite levels: 0%, 15%, 20%,25% and 25% + 1 N NH4Cl solution. The result shows that the appropriate mixture is fly ash + 15% bentonite with permeability of 4,065 x 10-7. The mixture complies with local regulations where the permeability coefficient of the bottom layer of the landfill should be less than 10–6 cm/s and have a low cracking value (CIF). Furthermore, the addition of saline solution to the composite can rise the value of the optimum moisture content. However, saline conditions can decrease the value of CIF drastically

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