Pengaruh Karakteristik Sub-das Ganggang terhadap Banjir di Desa Ngulanan Kecamatan Dander Kabupaten Bojonegoro

The research was aimed to observe the characteristic of Ganggang sub-watershed in Bojonegoro regency. Several characterstics of Ganggang sub-watershed that observed in this study were (1) land use, (2) topography, (3) shape of the Ganggang sub-watershed, (4) local drainage system, and (5) land use coefficient. Field study observation and literature review were conducted to support this study. The results shown that Ganggang sub-watershed is characterized by several characteristics such as the majority of land use is paddy field, it has very flat topography, the sub-watershed is radial shape, it has medium drainage system, and land use coefficient of 0,2. These characteristics influence the regular flooding in Ngulanan, District Dander of Bojonegoro regency

Microalgae Growth and Phosphorus Uptake of Chlamydomonas Reinhardtii 11/32C under Different Inorganic Nitrogen Sources

Microalgae have been shown to be effective in utilizing both nitrogen and phosphorus from a wide range of wastewaters. This ability enhances the potential role that microalgae may have not only in wastewater bioremediation, but also in algal biomass production as an alternative feedstock for biofertiliser and biofuel production. This study was conducted to investigate the nutrient recovery from wastewater through microalgae biological uptake. The green microalgae of C. reinhardtii 11/32C used in this study and cultivated in Bold’s Basal Media (BBM). The algae culture was placed in a 2 liter of photobioreactor for approximately in 14 days. The results revealed that green microalgae can recover up to 5.9 % and 1.3% of N and P in their cell, respectively

The effect of forest area change in tropical islands towards baseflow and streamflow

Baseflow is a very important component in maintaining river flow. Baseflow is generated from groundwater flow. Baseflow is very important role in water conservation. Indonesia is located in a tropical climate. Based on the Koppen climate classification, Indonesia is included in the tropical rainforest climate (type Af), so that the characteristics of the climate, soil, flora and fauna are unique. About 70% of Indonesia's territory consists of water. Baseflow in the tropical island region has a unique characteristic. This research aimed to obtain the knowledge on the effect of forest area change in tropical islands towards the characteristics of baseflow and streamflow that involved RDF filter parameter calibration, baseflow contribution towards streamflow based on the Baseflow Index (BFI) and Q90 on Q50 ratio, rain contribution on the total baseflow, baseflow stream domination, and discharge stability of streamflow. This research was conducted in three sub watersheds with forest area percentage of ±18% Bango Sub watershed, ±23% Brantas Hulu Sub watershed, and ±59% Cobanrondo Sub watershed. The results showed that One Parameter Algorhitm method satisfied the application of baseflow separation. There was a positive correlation between rain and baseflow. Baseflow dominated the streamflow in the research location. The greater the forest area, the more stable the flow condition from year to year

Performance of Anaerobic Baffled Reactor for Decentralized Wastewater Treatment in Urban Malang, Indonesia

In order to assess the impact of the Sanitation by Communities (SANIMAS) program for community-led sanitation in Indonesia (established in 2002), this research work was conducted with the aim of characterizing the current performance of anaerobic baffled reactors (ABRs), which were deployed in high numbers for the provision of domestic wastewater treatment in densely populated urban areas in Malang (Indonesia). Small and decentralized sewage treatment facilities serve ⇡3% of the total population in Malang, including 89 ABR treatment plants. Our findings reveal that only 14% of the 89 ABRs in Malang have an acceptable performance with regard to pollutant removal and integrity of their building structure, but the majority of them produce a treated effluent of poor quality, according to discharge consents set by the Ministry of Environment and Forestry of the Republic of Indonesia (Regulation No. P.68/2016). Clearly the lack of consistent operation and maintenance practices have had a detrimental effect on these decentralized sewage treatment systems, despite their robustness and buffer capacity to cope with changes in organic and hydraulic loading rates. Urbanization will continue to exert pressure on the provision of sanitation services in lower and middle economies, and the role of decentralized sewage management systems is expected to be prominent in the UN’s Sustainable Development Goals era (2015–2030); however, sustainable service delivery must be conceived beyond the provision of sanitation infrastructure

Microalgae growth and nutrient recovery of chlamydomonas reinhardtii 11/32c cultivated under laboratory-controlled condition

Microalgae have been identified as one of the most promising sources for future wastewater treatment and generate many valuable products. Photosynthetic microalgae utilize energy from the sun and assimilate nutrients like carbon (C), N and P from wastewater. Microalgae can grow rapidly in wastewater and produce biomass that can be used to produce biofuels, fine chemical products, and bio-fertilizers. This study was conducted to investigate the nutrient recovery from wastewater through microalgae biological uptake. The green microalgae of C. reinhardtii 11/32C used in this study and cultivated in Bold�s Basal Media (BBM). The algae culture was placed in a 2 liter of photobioreactor for approximately in 14 days. The green C.reinhardtii 11/32C were cultivated in the following conditions: photoperiod 16 hr light, 8 hr dark (16:8); light intensity 250±5 μEm-2s-1; and temperature 20±3oC which run in triplicates. The liquid samples were collected every two days over a period of 14 days for Total Suspended Solids (TSS), Volatile Suspended Solids (VSS), Nitrate (NO3-), Phosphate (PO43-), Chlorophyll-a, Total Phosphorus (TP) and Total Nitrogen (TKN). The results revealed that green microalgae can uptake nutrient at the rate of 2.13 mg N/l/d and 0.5 mg P/l/d. These results could recover up to 5.9 % and 1.3% of N and P in their cell, respectively