In a recent study by Cai et al. about water shortages in Beijing-Tianjin-Hebei urban areas, virtual water has become the central concept of the groundwater security strategy by suggesting increasing imports of water-intensive agricultural products instead of utilizing the depleted groundwater resources for production. However, despite reviewing the content, we could not see how the authors discussed the households’ economic and financial issues from both production and consumption perspectives.

Water is regarded as indefeasible necessity of human civilization. In the South Asia region, the groundwater resource is poised as essence of life, security and development. Bangladesh is not an exception from that. Due to scarcity as well as disproportionate availability of surface water supply, the groundwater resource is veered into vital source to undergird heavy demand of water supply for livelihoods, industrial and agricultural purposes. Considering these, the groundwater resource governance is crucial since it is the (...) mainstay of upholding economic, social and development rights; failure to ensure proper governance would only drag the country into the tentacles of environmental scourge, conflict and food insecurity. The paper endeavors to analyze the role and significance of civil society on groundwater resource management. It explores the nature of challenges that civil society is encountering during its engagement with groundwater resource governance. This paper undertakes to outline national legislative and policy response to groundwater resource management in Bangladesh. It also scrutinizes in detail of groundwater resource aspect in international law and would reveal that, considering the gravity of the issue, both the domain of international law and national law contribute below the par to the issue. The paper further contends that existing legislative and policy structure of Bangladesh eventually maims the civil society from contributing and bars it to facilitate effective participation of the commons. In the concluding remarks, the paper highlights suggested recommendations stemming from discussions, observations and policy reports to bolster the affiliation of civil society in the governance of groundwater resource. (shrink)

The impact of crude oil on the permeability of the soil in a non oil producing community in Enugu State was investigated using disturbed A 6 CL soil sample collected from Ibagwa Nike area of the state. The sample was divided into five 5 portions and each of the four 4 portions was dosed with Bonny light crude oil at 2 , 4 , 6 and 8 by weight of the samples. The physical properties of the uncontaminated soil were tested (...) and analyses and used as control. The aim of the laboratory investigation was to determine the effects of crude oil on the permeability of the soil. The permeability of the uncontaminated soil was found to be 1.2609x10 7. Permeability tests were also conducted on the contaminated soil samples at the various percentage contaminations. The results showed that at 2 crude oil contamination the permeability was 9.6403x10 9, a drastic reduction. The other results were 6.9600x10 6, 2.2621x10 8 and 9.1286x10 8 at 4 , 6 , and 8 contamination levels, respectively. The ranking after contamination is seen to drop within the range of 10 8 and 10 9 showing a change in the permeability due to oil content. This observed reduction in permeability alters the natural groundwater recharge which can be remedied by enhanced bioremediation through aeration of the soil. Iloeje A. F. | Aniago V. "Effect of Crude Oil on Permeability Properties of the Soil" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-1 | Issue-1 , December 2016 . (shrink)

Một bài điều tra hết sức công phu của Flavell et al., đăng lần đầu trên New York Times ngày 29-8-2023, đang dấy lên mối lo lắng cho tương lai nguồn nước ngầm ở Mỹ. Một hiểm họa môi trường thực sự lớn và hiển hiện chứ không ở đâu xa xôi. Trên thực tế, 90% lượng nước sử dụng giúp biến rất nhiều vùng đất Mỹ trở thành các trang trại, cánh đồng trù phú là nước ngầm. Vấn đề (...) ở chỗ, nước ngầm được hút lên để sử dụng canh tác nông nghiệp và sau đó không quay trở lại các mỏ nước ngầm. Tình trạng này kéo dài sẽ dẫn tới sự cạn kiệt vĩnh viễn nguồn dự trữ nước ngầm. (shrink)

E-waste, also known as waste from electrical and electronic equipment, is a solid waste that accumulates quickly due to high demand driven by the market for replacing newer electrical and electronic products. The global e-waste generation is estimated to be between 53.6 million tons, and it is increasing by 3–5% per year. Metals make-up approximately 30% of e-waste, which contains precious elements Au, Ag, Cu, Pt, and other high-value elements, valued at USD 57 billion, which is driving the e-waste recycling (...) industry. It is noteworthy that the recycling of precious elements from e-waste has emerged as a profitable enterprise in several parts of developing nations. E-waste contains 50–100 times higher levels of precious metals compared to natural ores, making it suitable for mining. E-waste recycling in developing nations, mostly occurs through the informal sector comprising manual collection, crushing, segregation and selling of precious elements, such as Au, Ag, Cu, Pb, Pt, and other rare elements (Nd, In, and Ga). The organized sector, on the other hand, mostly employs mechano-chemical methods, such as pyrometallurgy, hydrometallurgy, and bio-hydrometallurgy, which have serious environmental consequences. Both the informal and formal sectors of e-waste processing lead to the leaching of toxic elements into groundwater and soils. Owing to the lesser efficiency of greener technologies, such as phytoremediation and bioremediation, their use in precious metal extraction is very limited. However, this review explores several hyper-accumulating and tolerant plants viz. Brassica juncea and Berkheya coddii, which holds great potential in phytomining of precious metal from e-waste. Thus, the state of the art in precious metal extraction from e-waste as well as the advantages and disadvantages of different metal extraction technologies has been reviewed. (shrink)

Nutrient losses from sloping farmland in karst areas lead to the decline in land productivity and nonpoint source pollution. A specially tailored steel channel with an adjustable slope and underground hole fissures was used to simulate the microenvironment of the "dual structure" of the surface and underground of sloping farmland in a karst area. The artificial rainfall simulation method was used to explore the surface and underground runoff characteristics and nutrient losses from sloping farmland under different rainfall intensities. The effect (...) of rainfall intensity on the nutrient loss of farmland on karst sloping land was clarified. The results showed that the surface was the main route of runoff and nutrient loss during the rainy season on sloping farmland in karst areas. The influence of rainfall intensity on the nutrients in surface runoff was more substantial than that on underground runoff nutrients. Nutrient loss was more likely to occur underground than on the surface. The losses of total nitrogen, total phosphorus, and total potassium in surface and underground runoff initially increased and then gradually stabilized with the extension of rainfall duration and increased with increasing rainfall intensity and the amount of nutrient runoff. The output of nutrients through surface runoff accounted for a high proportion of the total, and underground runoff was responsible for a low proportion. Although the amount of nutrients output by underground runoff was small, it could directly cause groundwater pollution. The research results provide a theoretical reference for controlling land source pollution from sloping farming in karst areas. (shrink)