Envirotek : Jurnal Ilmiah Teknik Lingkungan

A Case Study of urban heat island based on Urban Growth and Thermal Impact in Sidoarjo East Java

2025-06-21T08:43:08+00:00

Sidoarjo is one of the districts in the Surabaya Metropolitan Area (SMAs). This has led Sidoarjo Regency to experience an increasing rate of urbanization and rapid development, especially in the industrial and residential sectors. With these anthropogenic activities, Sidoarjo Regency has experienced changes in land cover areas. Areas or regions that were originally green areas have gradually turned into built-up areas or land. The change in land cover area can make the surface temperature in Sidoarjo Regency increase, especially in the city centre area with a high rate of urbanization and development. This situation can eventually trigger the Urban Heat Island (UHI) phenomenon. This urban heat island phenomenon will be very detrimental to urban areas if not handled with the right strategy, because it will damage the environment and ecosystems and can be the largest contributor to the increase in global surface temperatures. The aim of this study is to calculate the growth of the heat island phenomenon in Sidoarjo district.

Abundance and Characteristics of Microplastics in the Martapura River, Banjarmasin, South Kalimantan

2025-06-23T06:10:11+00:00

The Martapura River serves as a vital resource for local communities in Banjarmasin, South Kalimantan, functioning as a means of transportation, for domestic, tourism, and as a source of drinking water. However, the environment is experiencing pollution from various human activities, with microplastic contamination being a significant concern. The presence of microplastic particles in the waters can have negative impacts on aquatic organisms and pose health issues such as digestive problems, toxicity, immune dysfunction, and reproductive disorders. The purpose of this study is to investigate the abundance and characteristics of microplastics in the Martapura River in Banjarmasin, South Kalimantan. Water sampling was conducted at 10 locations, following the SNI 8995:2021 standard, and considering environmental conditions. Water sample preparation was carried out by adding 10% KOH, followed by microplastic density separation using saturated NaCl in a 3:1 ratio. A 20 mL supernatant solution was collected for observation using a Sedgewick Rafter Counting Cell and a binocular microscope. Based on the analysis of the 10 sampling points in the Martapura River, the abundance of microplastics ranged from 3,000 to 16,000 particles/L, with the following characteristics: fragments (29.90%), fibers (20.62%), pellets (26.80%), and films (22.68%). The highest abundance of microplastics was found in the Pasar Lama subdistrict and Basirih subdistrict, with 16,000 particles/L and 14,000 particles/L, where the most dominant type was fragment microplastics, accounting for 29.90%.

Tofu Wastewater Treatment and Bioelectricity Production Potential by Combining Anaerobic Baffled Reactor and Microbial Fuel Cells

2025-06-17T05:49:07+00:00

Anaerobic Baffled Reactor (ABR) systems have only been utilized to reduce pollutant compounds in wastewater. Anaerobic conditions in ABR can double as an anode chamber in Microbial Fuel Cells (MFCs) which require anaerobic conditions. This study aims to test the ability of COD and TSS removal in tofu wastewater and the potential electricity generated from a combination unit of ABR and MFCs. The experiment was conducted on a laboratory scale using a continuous system for 96 hours. ABR reactor was made consisting of 5 compartments, where the second compartment was installed anode for MFCs. The cathode chamber of the MFCs system was made separate from the ABR reactor and filled with electrolyte solution. The anode chamber in the ABR and the cathode chamber are connected by a salt bridge. Electrodes used in MFCs are zinc as anode and copper as cathode. The removal of pollutants in tofu wastewater reached 55.85% for COD and 88.68% for TSS. The electrical potential of MFCs increases along with the increase of organic matter removal in wastewater. The electric voltage generated reached 0.94 V and electric current 0.40 mA. The power density generated in this MFCs system reached 94 mW/m².

Bioremediasi Lahan Sawah Terkontaminasi Oli Bekas Menggunakan Teknik Pengomposan Secara Ek-Situ

2025-06-17T05:24:23+00:00

Penggunaan oli bekas sebagai bahan tambahan senyawa pestisida untuk mengusir hama pada pertanian padi di Kabupaten Karawang berpotensi menyebabkan kontaminasi tanah oleh hidrokarbon yang bersifat toksik. Salah satu upaya pemulihan yang dapat diterapkan adalah bioremediasi menggunakan teknik pengomposan yang memanfaatkan jerami pasca panen dan kapur dolomit sebagai bahan baku kompos. Penelitian sampel bersifat eksperimen, dimana tanah diambil pada sawah seluas 0,15 ha sebanyak 9 (sembilan) titik pada kedalaman 0,00-30,00 cm yang kemudian dikomposit menjadi satu. Proses pengomposan dilakukan dengan mencampurkan tanah dan bahan baku kompos (rasio 1:1, b/b) menggunakan 5 (lima) variasi yaitu kontrol tanah (tanah 4.500 g), kontrol jerami (4.500 g), A (tanah:jerami:dolomit sebanyak 4.500 gr: 4.410 gr: 90 gr), B (tanah:jerami:dolomit sebanyak 4.500 gr: 4.275 g: 225 g): dan C (tanah:jerami:dolomit sebanyak 4.500 g: 4.050 g: 450 g) dengan 3 (tiga) ulangan selama 30 hari. Hasil penelitian menunjukkan bahwa nilai pH, suhu, dan kelembaban semua rekator berada pada rentang optimal yaitu 5,07-6,43; 33,00-40,00°C; 50,00-70,00%. Kondisi tersebut mendukung terjadinya biodegradasi bahan organik melalui kadar hidrokarbon, dimana penurunan tertinggi ditemukan pada variasi C sebesar 66,22%.