Pentingnya mengetahui kandungan logam nikel (Ni) dalam air laut dan persebarannya disekitaran Teluk Kendari, Sulawesi Tenggara karena kebolehjadian terjadinya pencemaran limbah domestik dan akumulasi sedimentasi di badan perairan yang terbawa melalui aliran sungai dan drainase perkotaan. Penelitian ini menyajikan beberapa korelasi antara aktivitas keramaian masyarakat dengan tingkat kandungan logam Ni disekitaran Teluk Kendari yang dianalisis menggunakan instrumentasi spektroskopi serapan atom (SSA). Penentuan 5 titik lokasi berbeda dipilih berdasarkan banyaknya kegiatan aktivitas masyarakat. Selanjutnya, sampel diambil masing-masing sebanyak 1 Liter sejauh ±100 m dari garis pantai yang selanjutnya dianalisis menggunakan instrument SSA. Hasil penelitian menunjukkan bahwa adanya hubungan aktivitas keramaian kegiatan masyarakat terhadap tingginya kandungan logam Ni yang terakumulasi dalam air laut Teluk Kendari. Kandungan logam Ni yang diperoleh bervariasi berturut-turut T1< T4< T3< T2> T5 yaitu 0,047; 0,052; 0,063; 0,068; 0,073. Berdasarkan baku mutu, standar kandungan Ni dalam air laut sebesar 0,05 mg/L, sehingga pada T2, T3, T4, dan T5 dinyatakan telah melebihi ambang batas. Hal ini disebabkan lokasi tersebut maraknya aktivitas masyarakat sehingga kebolehjadian nilai logam Ni juga meningkat. Berdasarkan hasil penelitian ini memberikan informasi terkini terkait wilayah pencemaran lingkungan akibat akumulasi logam berat dan juga bagi masyarakat agar tidak mengkonsumsi ikan yang diperoleh dari Teluk Kendari.

Planning design of wastewater treatment plant in a market is needed to improve the quality of water that will be discharged so it doesn’t pollute the environment and the near. The goal of this study is to determine the discharge of wastewater will be treated and the design of treatment basin in the wet lods area of Mandonga Traditional Market. Result of wastewater is 7.88 m3/day with a waste concentration of pH 7, BOD 64.2 mg/day, and TSS 2.130 mg/day. Wet Lods Wastewater Treatment Plant in Mandonga Traditional Market has 6 compartments such as a control tub with the fine filter addition which has a volume of 0.072 m3/day, the initial settling tank has a volume of 1 m3/day, anaerobic biofilter has a volume of 1.83 m3/day, aerobic tubs have a volume of 0.42 m3/day, the final settling tank I has a volume of 1.1 m3/day and the final settling tub II has a volume of 1.1 m3/day.

This study aims to determine the percentage reduction in iron (Fe2+) and manganese (Mn2+) content in well water using carbon from cocoa peel as an adsorption media with media height variation. The results of this study indicate that well water sample contains iron (Fe2+) levels of 1.39 mg/L and manganese (Mn2+) of 0.76 mg/L. After filtration with 60 minutes contact using carbon of cocoa peel as an adsorption media without activation, iron content and manganese content in well water decreased. The percentage reduction of iron (Fe2+) content in media height 70 cm, 80 cm and 90 cm were 76.98%, 84.17% and 98.21%. Meanwhile, the percentage in manganese (Mn2+) content at 70 cm media height was 98,93% and archived an optimum reduction at 80 cm and 90 cm media height which is  99.79% with 60 minute contact time.

This study analyzed the concentrations of TSP and CO at 2 different sites in Kota Kendari. Measurement of TSP levels at the site I, Jl. MT Haryono, the highest concentration occurred in the morning (79 g/Nm3) compared to midday (51 g/Nm3) and in the afternoon (46 g/Nm3). Judging from the quality standards based on PP No. 41 of the year 1999, the concentration of TSP and CO on Jl. MT Haryono has not exceeded the quality standard. However, according to PP No. 22 of the year 2021, the CO level has reached the quality standard threshold. At site II, the TSP level at Jl. The highest Achmad Yani occurred in the morning at 63 g/Nm3 compared to midday (28 g/Nm3) and in the afternoon (35 g/Nm3) while CO levels in the morning, afternoon, and evening remained stable at 12,000 g/Nm3. Based on PP No. 41 of the year 1999, the concentrations of TSP and CO in ambient air on Jl. Ahmad Yani has not exceeded the quality standard, but if it is reviewed based on PP no. 22 of the year 2021, CO levels have exceeded the quality standard threshold. Physical factors (temperature, wind speed, and humidity) and anthropogenic factors such as motorized vehicle traffic are maybe contributions.

Fecal waste requires treatment (IPLT) that contains pollutant compounds which result in creating damage to the environment or potentially creating pollution. Therefore, we need a performance evaluation to optimize the performance of the Kendari City IPLT. The Kendari City IPLT serves processing of sewage sludge throughout the sub-district with sources from domestic waste processing units and facilities. Sludge desludging is only carried out by 3% of the total septic tank units that must be vacuumed. The purpose of this study is to determine the effectiveness of the performance of the IPLT in treating waste and determine whether the effluent generated from the IPLT has met the specified quality standards. This research method is to compare the effectiveness of Kendari City IPLT conditions with LH Regulation No. 05 of 2014. The BOD content after analysis was 125.1 mg/L and the oil content was 1 mg / l. The Kendari City IPLT treatment unit consisting of an imhoff tank, anaerobic pool, facultative pool and maturation pool in good condition some ponds did not meet the criteria according to the Ministry of Public Works in 1998. The imhoff tank was only 3.7 m (criteria 6-9 m), the anaerobic pool caused odor that can interfere, facultative pool water height of 2.0 m (criteria 1.2 - 2.4 m).