The reduction in water volume favors filamentous cyanobacteria and heterocyst production in semiarid tropical reservoirs without the influence of the N:P ratio

2021 ◽  
pp. 151584
Author(s):  
Camila Ferreira Mendes ◽  
Juliana dos Santos Severiano ◽  
Gustavo Correia de Moura ◽  
Ranielle Daiana dos Santos Silva ◽  
Flávia Morgana Monteiro ◽  
...  
Keyword(s):  
N:P Ratio ◽  
Water Volume ◽  
Filamentous Cyanobacteria ◽  
Tropical Reservoirs

Spatiotemporal Changes of Riverbed and Surrounding Environment in Yongding River (Beijing section) in the Past 40 Years

2020 ◽  
Vol 64 (4) ◽  
pp. 40407-1-40407-13 ◽  
Author(s):  
Ran Pang ◽  
He Huang ◽  
Tri Dev Acharya
Keyword(s):  
Economic Development ◽  
Water Conservation ◽  
Human Activities ◽  
Urban Areas ◽  
Water Volume ◽  
Cropland Area ◽  
The Past ◽  
Surrounding Environment ◽  
Spatiotemporal Changes ◽  
Yongding River

Abstract Yongding River is one of the five major river systems in Beijing. It is located to the west of Beijing. It has influenced culture along its basin. The river supports both rural and urban areas. Furthermore, it influences economic development, water conservation, and the natural environment. However, during the past few decades, due to the combined effect of increasing population and economic activities, a series of changes have led to problems such as the reduction in water volume and the exposure of the riverbed. In this study, remote sensing images were used to derive land cover maps and compare spatiotemporal changes during the past 40 years. As a result, the following data were found: forest changed least; cropland area increased to a large extent; bareland area was reduced by a maximum of 63%; surface water area in the study area was lower from 1989 to 1999 because of the excessive use of water in human activities, but it increased by 92% from 2010 to 2018 as awareness about protecting the environment arose; there was a small increase in the built-up area, but this was more planned. These results reveal that water conservancy construction, agroforestry activities, and increasing urbanization have a great impact on the surrounding environment of the Yongding River (Beijing section). This study discusses in detail how the current situation can be attributed to of human activities, policies, economic development, and ecological conservation Furthermore, it suggests improvement by strengthening the governance of the riverbed and the riverside. These results and discussion can be a reference and provide decision support for the management of southwest Beijing or similar river basins in peri-urban areas.

HOUSEHOLD WATER BALANCE AND ASSESSMENT OF WATER VOLUME FOR IRRIGATION IN AGRO LANDSCAPES OF THE KYZYLSU-YUZHNAYA BASIN

2020 ◽  
pp. 102-109
Author(s):  
D.KH. DOMULLODZHANOV ◽  
◽  
R. RAHMATILLOEV
Keyword(s):  
Water Balance ◽  
River Basin ◽  
Water Use ◽  
Storage Systems ◽  
Low Cost ◽  
Field Studies ◽  
Water Volume ◽  
Land Productivity ◽  
Household Water ◽  
And Storage

The article presents the results of the field studies and observations that carried out on the territory of the hilly, low-mountain and foothill agro landscapes of the Kyzylsu-yuzhnaya (Kyzylsu-Southern) River Basin of Tajikistan. Taking into account the high-altitude location of households and the amount of precipitation in the river basin, the annual volumes of water accumulated with the use of low-cost systems of collection and storage of precipitation have been clarified. The amount of water accumulated in the precipitation collection and storage systems has been established, the volume of water used for communal and domestic needs,the watering of livestock and the amount of water that can be used to irrigate crops in the have been determined. Possible areas of irrigation of household plots depending on the different availability of precipitation have been determined. It has been established that in wet years (with precipitation of about 10%) the amount of water collected using drip irrigation will be sufficient for irrigation of 0.13 hectares, and in dry years (with 90% of precipitation) it will be possible to irrigate only 0.03 ha of the household plot. On the basis of the basin, the total area of irrigation in wet years can be 4497 ha, and in dry years only 1087 ha. Taking into account the forecasts of population growth by 2030 and an increase in the number of households, the total area of irrigation of farmlands in wet years may reach 5703 hectares,and in dry years – 1379 hectares. Growing crops on household plots under irrigation contributes to a significant increase in land productivity and increases the efficiency of water use of the Kyzylsu-yuzhnaya basin.

Study of The Influence of Different Variables on Clathrate Practical Applications in Phenol Removal

2020 ◽  
Vol 38 (9A) ◽  
pp. 1373-1383
Author(s):  
Riyadh S. AL- Mukhtar ◽  
Shurooq T. Remedhan ◽  
Marwa N. Hussin
Keyword(s):  
Crystal Structures ◽  
High Capacity ◽  
Volume Ratio ◽  
Constant Speed ◽  
Water Volume ◽  
Phenol Removal ◽  
Process Performance ◽  
Economic Costs ◽  
Practical Applications ◽  
Glass Cell

In this work, effluent wastewater treated by using cyclopentane-water Clathrate system to treat water contaminates with phenols at concentrations (300, 250, 200, 150, 100 and 50) ppm in order to investigate the capability of process performance. Clathrate or hydrate are strong crystal structures including water (host particles) and little particles (guest particles). The experiments were conducted at different cyclopentane-water volume ratios (1: 2 and 1: 4). The work was done in a 250 ml glass cell with an electric mixer at a constant speed of 280 cycles per minute. Phenol was highest removal percent at 300ppm at 1: 4volume ratio was (92.3%), while the lowest concentration at 50 ppm and 1: 2volume ratio was (55%). Yield and Enrich factor had the highest values at the lowest concentration 50ppm and 1:2 volume ratio were (85% and 2.42) respectively. The technique of the Clathrate proved that it has a high capacity in the separation and achieve high removal percentage compared to other methods at standard conditions when the pressure of 1 atmosphere and temperature higher than the degree of freezing water and less economic costs compared to other methods.

KAJIAN PRODUKSI NASI KUNING INSTAN DAN KARAKTERISTIKNYA

2019 ◽  
Vol 5 (2) ◽  
Author(s):  
Kirana Sanggrami Sasmitaloka ◽  
Imia Ribka Banurea ◽  
Sri Widowati Widowati
Keyword(s):  
Water Absorption ◽  
Research Method ◽  
Raw Materials ◽  
Water Volume ◽  
Rehydration Ratio ◽  
Drying Characteristics ◽  
Instant Form ◽  
Randomized Design ◽  
Cooking Water ◽  
Comparative Treatment

ABSTRACTThe manufacture of food products in an instant form can reduce obstacles in storage and distribution. The purpose of this study was to determine the characteristics of instant yellow rice produced using a cabinet dryer. The research method used was a non factorial Complete Randomized Design, with comparative treatment of rice and cooking water volume (1: 1,1; 1: 1,2; and 1: 1,3) as well as the type of yellow rice seasoning used (instant seasoning and processed seasoning). The best treatment is obtained on instant yellow rice produced using processed seasonings with a comparison of raw materials with cooking water volume of 1: 1,3. This product has a yield characteristic of 98.29%, rehydration time 4.32 minutes, kamba density 0.351 g/ml, water absorption 64.78%, development volume 174.51%, rehydration ratio 3.44, chroma value 30.29 and hue value 96.38.Keywords: instant yellow rice, rehydration time, drying, characteristics ABSTRAKPembuatan produk makanan dalam bentuk instan dapat menekan kendala dalam penyimpanan serta distribusi . Tujuan  penelitian ini adalah untuk mengetahui karakteristik nasi kuning instan yang diproduksi dengan menggunakan cabinet dryer. Metode penelitian yang digunakan adalah Rancangan Acak Lengkap non faktorial, dengan perlakuan perbandingan beras dan volume air pemasakan (1:1,1; 1:1,2; dan 1:1,3) serta jenis bumbu nasi kuning yang digunakan (bumbu instan dan bumbu olahan). Perlakuan terbaik diperoleh pada nasi kuning instan yang diproduksi menggunakan bumbu olahan dengan perbandingan bahan baku dengan volume air pemasakan sebanyak 1:1,3. Produk ini memiliki karakteristik rendemen 98,29%, waktu rehidrasi 4,32 menit, densitas kamba 0,351 g/ml, daya serap air 64,78%, volume pengembangan 174,51%, rasio rehidrasi 3,44, nilai chroma 30,29 dan nilai hue 96,38.Kata kunci: nasi kuning instan, waktu rehidrasi, pengeringan, karakteristik

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