Leachate is one of the results of rainwater infiltration and the degradation of microorganisms in waste. Some leachate types usually contain salinity which is an inhibitor in biological treatment processes. Aerobic biological treatment usually also requires sufficient dissolved oxygen (DO) levels. This study aimed to determine the effect of salinity on oxygen transfer in saline leachate. This study used a DO meter to measure the DO concentration in the 2 L volume reactor. There were two variations, namely leachate without salinity and with salinity 6 ppt, where the processing was carried out with three repetitions. The final oxygen transfer coefficients for the leachate without salinity and with salinity were 0.021 and 0.014, respectively. While the detention time required for leachate without salinity is 47.5 minutes, it takes 71.43 minutes with salinity.

The policy of full access to sanitation through the Sustainable Development Goals (SDGs) (2015–2030) requires community participation. The role of society in this regard can depend on the Human Development Index (HDI) and Gross Regional Domestic Product (GRDP). The incidence of diarrhea in all age groups is only 3.5%. East Java is a province that contributes significantly to the number of cases of diarrhea in children under five in Indonesia, so sanitation is critical. This study aimed to determine the effect of HDI and GRDP simultaneously on sanitation access in districts and cities in East Java Province. This research was conducted using secondary data from the Central Statistics Agency of East Java Province. The data analysis method used is multiple linear. HDI and GRDP variables positively and significantly impact the number of sanitation access districts and cities of East Java Province in 2016-2019. GRDP partially has a regression coefficient of 0.223 greater than HDI, which means that an increase in GRDP by one unit of rupiah causes an increase in the achievement of sanitation access in East Java Province. As policymakers and implementers, local governments must pay attention to HDI and GRDP to access proper sanitation in East Java Province.

Kepuasan konsumen merupakan hal yang sangat penting karena dapat membuat konsumen kembali menggunakan jasa yang sama lagi. Dalam penelitian ini, konsumen yang dimaksud adalah mahasiswa. Penelitian ini dilakukan karena terdapat keluhan pada kalangan mahasiswa pada bagian Tata Usaha khususnya dalam hal proses pengajuan proposal Tugas Akhir mahasiswa di salah satu perguruan tinggi swasta di Bandung. Pelayanan yang diberikan juga banyak yang harus diperbaiki. Salah satu permasalahan yang terjadi yaitu adanya delay yang sangat panjang untuk mengajukan proposal Tugas Akhir mahasiswa. Hal ini merupakan bagian dari pemborosan yang terjadi pada bagian Tata Usaha. Dalam upaya meningkatkan kualitas pelayanan dan kepuasan pada konsumen pada bagian Tata Usaha salah satu perguruan tinggi swasta di Bandung, dilakukan penelitian menggunakan metode lean service dan service performance terhadap proses pengajuan proposal TA dan pelayanan pada Tata Usaha. Pada bagian akhir akan didapatkan tingkat kualitas pelayanan dan rekomendasi perbaikan. Lean service digunakan untuk menghilangkan waste yang tidak memberikan nilai tambah pada konsumen. Service Performance digunakan untuk menganalisis tingat kinerja pelayanan pada bagian Tata Usaha. Metode yang digunakan dalam menerapkan lean service adalah DMAIC dan service performance. Didapatkan penurunan waktu yang sangat derastis yaitu 98,95% (dari 10235 menit menjadi 107 menit) dan terdapat 8 atribut yang harus diperbaiki dalam meningatkan kualitas pelayanan.

Due to human activities, both domestic and non-domestic, river pollution can occur over time. One of the rivers in Surabaya, which is located in a densely populated area, is Bokor River. Residents use Bokor River for pond activities, so the water's quality must meet these quality standards. This study aims to analyze the suitability of river water quality in Bokor River, Surabaya City, which has met its quality standards for this activity. Water quality measurement is carried out by existing testing with the standard method that is used as a reference in Indonesia. Water quality measurements were determined based on the parameters BOD, COD, DO, TSS, Phosphate (PO4 3-), Nitrate (NO3), and Ammonium (NH4). The measured DO, BOD, phosphate, and ammonia parameters did not meet these quality standards. However, DO parameters in the upstream still meet the quality standard (above 3 mg/L), while after that, they experience a decrease in quality. Meanwhile, nutrient parameters, especially ammonia, do not meet quality standards, as it is known that ammonia can provide toxic properties to fish. In addition, there is an opportunity for eutrophication of this quality. Pollutants entering the Bokor River are point sources and non-point sources, which cannot be located precisely and generally consist of many relatively small individual sources.