The study was conducted to investigate the performance of Decentralized Wastewater Treatment System in Rakibnagor Slum, Sakhipur under Tangail District. For investigating the performance sample was collected from outlet of the decentralized wastewater treatment system whereas different parameters such as DO, BOD, pH, EC, TDS, alkalinity and hardness of the water samples were analyzed. The measured values of physicochemical parameters of water sample collected from the outlet of decentralized wastewater treatment system were: DO (4.4 mg/l), BOD (2.4 mg/l), pH (7.8), EC (1521 µs/cm), TDS (757 mg/l), alkalinity (260 mg/l) and hardness (253.2 mg/l). The study revealed that most of the water quality parameters were suitable for irrigation and fisheries. But the measured values of hardness and Electrical Conductivity (EC) exceeded the standard limit for irrigation and fisheries. Introduction Water is very important abiotic component of the environment. Without water life on earth would no...

About 12.5 million people use potable drinking water supplied by DWASA. Water thus supplied by DWASA is first stored at the underground reservoir and then pumped to overhead reservoirs at household level. This study focuses on the quality of water supplied by DWASAboth in dry and wet seasons by determining presence and amounts of different parameters like Ammonia, Chlorine and Fecal Coliform.Presence of fecal coliform in water is the indication of animal or human waste and pathogens causing serious illness. Water containing high ammonia induces taste and odor problem as well as decreased disinfection. Chlorine in water acts a disinfectant but excess amount causes odor problem. This study evaluates the quality of water supplied by DWASA collected from pumping stations, standpipes, house connections as well as water collected from storage reservoirs of different households at different zones of Dhaka city. No definite evidence was found that water supplied by DWASA contained Fecal Coliform.However, presence of Fecal Coliform was observed in samples collected from different areas, especially, the older parts of Dhaka City. Presence of Fecal Coliform in different samples indicate the possibility of leakage in the distribution network and contamination in household water reservoirs.

This study deals with evaluating the surrounding environment at some selected locations (Hazaribagh, Mitford Ghat, Sadarghat and Postogola) around Buriganga River, to evaluate the river’s water quality in terms of some very fundamental water quality parameters (such as pH, temperature, alkalinity, turbidity, iron, chloride and BOD). To do this assessment for the Buriganga River, the study area was chosen to find out the water quality parameters such as the pH of water of river Buriganga was shown a variation from 7.4 to 6.8. The right bank of the river holds higher pH value from the left bank and middle. The colour of the river water was shown a variation from 322 to 756 mg/l. The turbidity of the river water was shown in a variation of 7.2 NTU to 55 NTU. The chloride of water of the river Buriganga was found in a range of 55 mg/l to 178 mg/l. Alkalinity of water of the river Buriganga was found to vary from 370 mg/l to 471 mg/l. Among them 370 mg/l was shown in Hazaribagh and 471 m...

La ruta que seguirán estas líneas pisa primero la cuenca central del río Laja. Vamos detrás de los pasos de Braniff (1965), Nalda (1977), Crespo (1979), Flores (1980), Castañeda (1983), Nieto (1987) y otros, cuando apenas reconfiguraban la anatomía de Mesoamérica Septentrional a partir del mapeo e identificación de un sistema constructivo propio y recurrente, al que denominaron Tradición Patios Hundidos o Cerrados. Conviene detenerse ahora en Cañada de la Virgen, centro ceremonial emblemático de aquella tradición, donde primero Nieto (1996) y posteriormente Zepeda (2000) habrían de coordinar el proyecto que permitió la apertura del sitio, obtuvo las fechas calibradas que ayudaron a definir la temporalidad de la tradición arquitectónica e incluso revelaron el origen étnico de los entierros recuperados en el sitio (Zepeda y Sandoval, 2019).

Although more than 2000 shelters with non-figurative carvings ascribed to a Mesolithic style are known within the quartzitic sandstone megaclast lag deposits in the southern Paris area, only three shelters with figurative representations of Late Paleolithic style have been recognized. Upright megaclasts are rare in the regional lag deposits but two upright quartzitic sandstone megaclasts occur close to two of these Late Paleolithic shelters. Detailed morphological surveys of these megaclasts allow us to suggest that they were erected by humans. The fortuitous conjunction of finding an upright megaclast close to two Late Paleolithic shelters is infinitesimally small in term of probabilistic considerations. Thus, the Late Paleolithic engraved shelterupright megaclast pairs are not likely to be independent but are probably linked by culture, and so the megaclasts are expected to date from the Late Paleolithic. We suggest that they were 'engineered landmarks' erected to mark places that had cultural significance for Late Paleolithic hunter-gatherer people. The energy dedicated to erect the megaliths is an indication that shelter-megalith pairs probably had important spiritual and symbolic significance. We suggest that both contributed to locate and anchor stories to landscape features. Indeed, these shelter-megalith pairs were in the hinterland of the large open-air camps settled on fords on game migratory routes crossing the Seine River. These specific markers could have encompassed a storyline about landscapes as the support for learning routes through them. One possibility is that they had a timed relationship with herd migration.