SEWAGE DISPOSAL SITUATION AT DIGHA COAST: A TIME SERIES ANALYSIS

West Bengal is a maritime state in the northeastern part of the Indian subcontinent with a coastal area of 10,158.22 sq. km. The coastal region consists of the Digha coast, which is noted for its tourism and fish landing activities. We highlight in this paper, a load of nitrate and phosphate during premonsoon in the aquatic phase of Digha for more than three decades (1984 – 2020) to observe the trend of these two variables, which are important components of sewage. A uniform increase in the concentrations of the nutrients is observed except in the years 2009 and 2020. A sudden peak observed for both the nutrients during 2009 may be attributed to Aila, a super cyclone that hit coastal West Bengal on 25th May 2009. The dip in the levels of nutrients during 2020, may be the effect of the COVID lockdown phase in the state during which all the tourism and fish landing activities were completely paralyzed.

The influence of water price and the number of residents on the economic efficiency of water recovery from grey water

This article presents the results of an analysis of the economic viability of using an installation for the treatment of grey water. Economic indicators in the form of simple payback time (SPBT) and net present value (NPV) were used in the analysis. The use of a dual water supply system should theoretically enable the reduction of the costs of both water supply and sewage disposal, ensuring investment profitability. The article presents the impact of the number of residents as well as the impact of water and sewage on the profitability of using example water-recovery systems. It was found that both factors have a huge impact on the result of the economic analysis. For a small number of residents and at a low price of water supply and sewage disposal, it is not profitable to invest in a water-recovery system. This is due to the high price of purification devices.

Water Modernity and Society in Linz, ca. 1700–1900

This article investigates the transition to a modern water supply and sewage disposal system. By focussing on the of the Upper Austrian mid-size city of Linz in a long-term perspective from circa 1700 to 1900, we trace continuities and disruptions of existing solutions and question the narrative of modernisation. We research the actors involved in the decision-making and implementation processes, paying special attention to the so-far neglected group of city inhabitants and their motives. Finally, we raise questions of integration and exclusion with regard to water.