Articles you may be interested inGround and river water quality monitoring using a smartphone-based pH sensor AIP Advances 5, 057151 (2015); 10.1063/1.4921835The Langat River water quality index based on principal component analysis AIP Conf.Abstract. The rate of deoxygenation is one important parameter in the calculation of river water quality. Deoxygenation process itself can be a general characteristic of the river in the perspective of its biological activity, i.e. the uptake of oxygen by microorganisms in performing the decomposition process. Determination of the rate of deoxygenation is usually performed in the laboratory by carry out incubation and analysis on the sample of water for 10-20 days. However, to obtain the rate of deoxygenation with a shorter time, the physical condition of the river can be used in several equations proposed by Hydroscience. These equations utilize the physical condition of the river body, i.e. water depth, for the calculation of deoxygenation rate. In this study, the results of these empirical equations for the value of the rate of deoxygenation were compared to the results of laboratory analysis for Citepus River. Based on the laboratory analysis, the deoxygenation rate was highly varied around 0.06 to 0.48 per day, whereas the result of the empirical equation calculation shows numbers that are not too varied, i.e. 0.42 to 0.64 per day. In this case, the highest value of deoxygenation rate resulted from laboratory analysis similar to the lowest value of calculation using Hydroscience equation.

Self-purification process is an important process in the effort of recovering the river condition itself. This process usually takes place naturally. However, several inhibitions might disturb the process. It was indicated by the slow deoxygenation rate and unhealthy river condition. This research aims to identify the influence parameters responsible for the slow of self-purification in the Cikapundung River, which is located in the urban area of Bandung City, Indonesia. The river water samples were taken and analyzed in the laboratory to obtain the water quality. The deoxygenation rate was also calculated based on the Slope Method after data was acquired from 10 days daily observation. Research showed that the value of urban river deoxygenation rate is relatively low. The low value of the rate of deoxygenation led to the difficulty in rivers to purify themselves. Pollutants inhibiting the process include phenol, detergent, and heavy metals, which are contaminating the river over the maximum standard. Biologically, the decomposer consists in the river is few. It leads to a slow organic degradation rate. The condition is representing the low capacity of self-purification of the Cikapundung River which is caused mainly by chemical and biological parameters.

Buangan limbah cair yang berasal dari kegiatan domestik mengandung BOD yang relatif tinggi. Secara alamiah, polutan organik yang masuk ke badan air penerima dapat didegradasi melalui proses self purification. Proses degradasi ini dapat direprestasikan dengan penurunan oksigen atau deoksigenasi, sedangkan laju deoksigenasi menandakan kecepatan degradasi tersebut berlangsung. Penelitian ini bertujuan untuk mendapatkan nilai laju deoksigenasi di Sungai Cicadas, Bandung, yang memiliki pencemaran berat akibat buangan cair dari daerah padat penduduk. Metode yang digunakan adalah pengamatan laboratorium selama 10 hari pada sampel yang diambil di 3 titik. Pengolahan data yang dilakukan menggunakan Metode Slope. Selain itu, laju deoksigenasi juga dihitung menggunakan rumus empiris yang dikeluarkan oleh Hydroscience. Hasil penelitian ini menunjukkan bahwa laju deoksigenasi berkisar antara 0,01 hingga 0,17 per hari. Jika dibandingkan dengan hasil perhitungan menggunakan rumus empiris, nilai ini sangat kecil. BOD ultimate yang diperoleh memiliki rentang antara 42,76 hingga 682 mg/L. Nilai laju deoksigenasi yang rendah ini memperlihatkan bahwa walaupun limbah dari kegiatan domestik mudah didegradasi, namun proses degradasi dapat berlangsung lambat akibat faktor-faktor penghambat yang kemungkinan terjadi pada sungai tersebut.

Residents and the government of Babakan Village have had difficulty managing their waste since the closure of the Babakan landfill several years ago. This study aims to formulate the concept of waste management in the Babakan Village, Bandung Regency, considering the waste generation and the characteristics of the residents. Data on the waste generation was obtained by sampling in several houses, while data on the characteristics of citizens was collected by distributing questionnaires. Based on the data gathered, it was found that the average waste generation per person per day in the Babakan Village was 0.134 kg with the composition of organic waste dominating up to 70.5%, while inorganic as much as 29.5%. The dominant types of waste in inorganic waste groups are plastic. In general, respondents have a good level of knowledge about waste. The enthusiasm of the community is high in participating to manage the waste with the 3R programs, such as recycling and operation of waste banks. With these data, the planning of handling of organic waste is done by a simple composter and biopori cylindrical water absorption hole, while handling inorganic waste can be done by operating a waste bank system.

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