World Journal of Environmental Engineering

Current Issue» Volume 2, Number 1 (2014)

Article

Major Nutrients and Their Stoichiometry over 45 Years (May 1963-May 2008) at the Northern and Southern Basin of Lake Biwa, Japan

1National Environmental Engineering Research Institute (CSIR), Mumbai Zonal Lab, Mumbai, India

2Graduate School of Human and Environmental Studies, Kyoto University, Kyoto, Japan


World Journal of Environmental Engineering. 2014, 2(1), 6-11
DOI: 10.12691/wjee-2-1-2
Copyright © 2014 Science and Education Publishing

Cite this paper:
Asheesh Shrivastava. Major Nutrients and Their Stoichiometry over 45 Years (May 1963-May 2008) at the Northern and Southern Basin of Lake Biwa, Japan. World Journal of Environmental Engineering. 2014; 2(1):6-11. doi: 10.12691/wjee-2-1-2.

Correspondence to: Asheesh  Shrivastava, National Environmental Engineering Research Institute (CSIR), Mumbai Zonal Lab, Mumbai, India. Email: asheesh.kj@gmail.com

Abstract

On the basis of the chemical components found in Lake Biwa, Japan from May 1963 to May 2008, the vertical variation (0~70 m depth) of total phosphorus (TP) and total nitrogen (TN) concentrations in the Northern Basin (Ie-1) were evaluated. Similarly, TP and TN concentrations were also discussed at the surface of the Southern basin (Nb-5). It was concluded that the second stage nutrient concentrations had decreased compared to Northern basin due to increased macrophyte growth, improvement in inflow river waters and implementation of laws. The long term variations in the TN/TP ratios were also discussed in relation to propagation of plankton. The lower TN/TP ratios observed in the Northern and Southern Basins waters were well coincident with the more frequent and denser propagation of N2-fixing cyanobacteria. Recently, the TN/TP ratios have shown a tendency of increase in Southern Basin suggesting a first sign for the restoration of water.

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References

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Article

Provision of Sustainable Water Supply System in Nigeria: A Case Study of Wannune-Benue State

1Department of Water Resources & Environ. Engineering, Ahmadu Bello University, Zaria, Nigeria


World Journal of Environmental Engineering. 2014, 2(1), 1-5
DOI: 10.12691/wjee-2-1-1
Copyright © 2014 Science and Education Publishing

Cite this paper:
D. M. Akali, O. T. Iorhemen, Otun J. A., Alfa M. I. Provision of Sustainable Water Supply System in Nigeria: A Case Study of Wannune-Benue State. World Journal of Environmental Engineering. 2014; 2(1):1-5. doi: 10.12691/wjee-2-1-1.

Correspondence to: D.  M. Akali, Department of Water Resources & Environ. Engineering, Ahmadu Bello University, Zaria, Nigeria. Email: akalimartins@yahoo.com

Abstract

It has been estimated that about 80 percent of all the diseases in the developing countries are related to unsafe water supply and inadequate sanitation. Lack of access to improved sanitation and safe water [1] supply is a global crisis. The effects of inadequate water supply are more visible and prevalent in Sub-Saharan Africa. This paper presents an assessment of the existing water supply system at Wannune-Nigeria based on an onsite-physical inspection and discussion with some stakeholders. The assessment revealed that the existing water supply systems broke down due to poor and/or lack of proper operation and maintenance practice. This led to the dependence by residents on water from unprotected wells, rivers and streams. This is capable of causing some sanitation and water related diseases like cholera, diarrhea, among others. To improve the situation, a provisional design of a water supply system for Wannune was done. The system comprises a water treatment plant of 5,000 m3/d capacity, transmission mains of 41,000 metres length and three elevated reservoirs of 200, 500 and 1000 m3 capacities for storage and transmission of the treated water.

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