Study on migration modes and correlative factors of Tubifex tubifex (Oligochaeta, Tubificidae) in source water

2010 ◽  
Vol 10 (6) ◽  
pp. 887-896 ◽  
Author(s):  
Huang Ting-lin ◽  
Nie Xiao-bao ◽  
Zhang Jin-song ◽  
Li Wei ◽  
Li Xiao-yu ◽  
...  
Keyword(s):  
Drinking Water ◽  
Surface Sediment ◽  
Tubifex Tubifex ◽  
Source Water ◽  
Overlying Water ◽  
Plant Migration ◽  
Deep Sediment ◽  
Water Plant ◽  
Worm Migration ◽  
Distinct Increase

Excessive propagation of tubificid in eutrophic source water can result in its emergence in the drinking water plant, which has been a troublesome problem in recent years. The migration of tubificid, especially drift migration in the source water is the main cause of worm pollution in drinking water plant. Migration modes and correlative factors of Tubifex tubifex, dominating the tubificid frequently, were investigated to help drinking water plant to solve worm pollution. Migration modes were divided into superficial, deep and drift migrations, representing migrations occurring in surface sediment (0–2 cm), deep sediment (deeper than 2 cm) and from sediment to overlying water, respectively. The results showed that both temperature and dissolved oxygen (DO) affect the worm migration modes. The maximum drift efficiency occurred at 22°C while DO was controlled around 8 mg O2 l−1. When the temperature was fixed at 20°C, maximum drift efficiency was observed at 2 mg O2 l−1. Distinct increase of superficial migration and decrease of deep migration were observed at 28°C compared to 16 and 22°C. Low DO appeared to be the main reason for the increase of worm’s deep migration. The results confirmed that worm drift from sediment to overlying water, which was influenced by the temperature and DO content, was the main cause of worm pollution in the drinking water plant.

Driving Force and Influence of Habitat Conditions on Tubifex tubifex (Oligochaeta, Tubificidae) Drift in Source Water

2014 ◽  
Vol 522-524 ◽  
pp. 1005-1008
Author(s):  
Fang Dong Hou ◽  
Fang Wang ◽  
Xiao Bao Nie
Keyword(s):  
Drinking Water ◽  
Water Flow ◽  
Driving Force ◽  
Driving Forces ◽  
Tubifex Tubifex ◽  
Source Water ◽  
Habitat Conditions ◽  
Overlying Water ◽  
Influence Of Temperature ◽  
Water Plant

Excessive propagation of Tubifex tubifex in eutrophic source water can result in the emergence of them in the drinking water plant, which has been a troublesome problem in recent years. Our objectives were to investigate the driving force of drift and quantify the influence of temperature and DO on the worm drift. Results showed that one of the major driving forces of the worm drift was water flow, which exhibited its effect by direct shear stress on the worm or inducing sediment suspension. The worm drift rates were increased with the decrease of temperature and DO content. The results confirmed that worm drift from sediment to overlying water, which was induced by water flow and could be influenced by temperature, DO content and sediment property was the main cause of worm pollution in drinking water plant.

Study on the concentration, flux, occurrence and retention processes of total phosphorus in Dahuofang reservoir

2021 ◽  
Author(s):  
Guoxian Huang ◽  
Xinghua Li ◽  
Mingdong Sun ◽  
Kun Lei
Keyword(s):  
Water Quality ◽  
Drinking Water ◽  
Total Phosphorus ◽  
Surface Sediment ◽  
Retention Rate ◽  
Sediment Layer ◽  
Overlying Water ◽  
Large Reservoir ◽  
Dahuofang Reservoir ◽  
Surface Sediment Layer

<p>Dahuofang reservoir (DHFR) is one of the most important drinking water sources in Liaoning province, China. The processes of total phosphorus (TP) concentration, flux and retention rate are very important to the water quality management and drinking water safety for the reservoir. Based on the monitoring data of meteorology, hydrology, water quality and sediment, etc. at the controlled stations of Dahuofang catchment during 1992-2017, The suspended sediment centration(SSC) and TP concentration variation and differences from upper to lower reach of DHFR  during floods in 2010 and 2013 are analyzed and compared respectively. Based  on the  mass balance equation of TP and the related fluxes formula at the different boundaries, the stocking processes in both the overlying water and the active surface sediment layer are solved. The results revealed the TP accumulation variation in the overlying water and the surface sediment layer, together with the controlling mechanism of TP concentration in overlying water under different floods events. Moreover, the results discovered that the combination of flood and dry hydrological rhythms is very important to maintain the dynamic balance of accumulated sediment and TP in the reservoir. The study does not only provide the effective calculation method forthe TP flux, accumulation and retention rate in the large reservoir, but also partly supply a new eyesight on the sediment nutrient control and related continuable management  for large reservoirs in north China.</p>

scholarly journals The concentration, flux and occurrence process of total phosphorus in Dahuofang reservoir and Suggestions for environmental optimal operation

2018 ◽  
Vol 246 ◽  
pp. 01109
Author(s):  
Xinghua Li ◽  
Dan Dai ◽  
Xiangqin Xu ◽  
Guoxian Huang ◽  
Mingdong Sun ◽  
...  
Keyword(s):  
Water Quality ◽  
Drinking Water ◽  
Total Phosphorus ◽  
Surface Sediment ◽  
Active Surface ◽  
Optimal Operation ◽  
Sediment Layer ◽  
Overlying Water ◽  
Dahuofang Reservoir ◽  
Surface Sediment Layer

Dahuofang reservoir is one of the most important drinking water sources in Liaoning province, China. Dynamics of total phosphorus (TP) concentration, flux and related retention processes in this reservoir are very important to the water quality management and drinking water safety. Based on the monitoring data of meteorology, hydrology, water quality and sediment from the main stations during 1992-2017, this paper analysed the TP fluxes in the different boundaries and the stocking process in both the overlying water and the active surface sediment layer using the mass balance method. This study revealed the TP accumulation variation in the overlying water and the surface sediment layer and the controlling mechanism of TP concentration in overlying water under different hydrological conditions. The results showed that the combination of flood and dry hydrological rhythms is important to maintain the dynamic balance of TP in the reservoir. Based on these results, to reduce the TP retention rate and accumulated TP in the active surface sediment layer, we put forward suggestions on environmental optimization operations during the early days of large flood and subsequent small flood season by opening the deep flood discharging holes of the reservoir and lowering upstream water level. These results provide an improved understanding and new eyesight of the nutrient control of large reservoirs in the north China.

Optimal operations for groundwater denitrification of drinking water using heterotrophic biological denitrification process

2006 ◽  
Vol 6 (2) ◽  
pp. 125-130
Author(s):  
C.-H. Hung ◽  
K.-H. Tsai ◽  
Y.-K. Su ◽  
C.-M. Liang ◽  
M.-H. Su ◽  
...  
Keyword(s):  
Drinking Water ◽  
Removal Efficiency ◽  
Nitrate Removal ◽  
Drinking Water Treatment ◽  
Nitrate Content ◽  
Source Water ◽  
Nitrogen Gas ◽  
Negative Effect ◽  
Denitrification Process ◽  
Heterotrophic Denitrification

Due to the extensive application of artificial nitrogen-based fertilizers on land, groundwater from the central part of Taiwan faces problems of increasing concentrations of nitrate, which were measured to be well above 30 mg/L all year round. For meeting the 10 mg/L nitrate standard, optimal operations for a heterotrophic denitrification pilot plant designed for drinking water treatment was investigated. Ethanol and phosphate were added for bacteria growing on anthracite to convert nitrate to nitrogen gas. Results showed that presence of high dissolved oxygen (around 4 mg/L) in the source water did not have a significantly negative effect on nitrogen removal. When operated under a C/N ratio of 1.88, which was recommended in the literature, nitrate removal efficiency was measured to be around 70%, sometimes up to 90%. However, the reactor often underwent severe clogging problems. When operated under C/N ratio of 1.0, denitrification efficiency decreased significantly to 30%. Finally, when operated under C/N ratio of 1.5, the nitrate content of the influent was almost completely reduced at the first one-third part of the bioreactor with an overall removal efficiency of 89–91%. Another advantage for operating with a C/N ratio of 1.5 is that only one-third of the biosolids was produced compared to a C/N value of 1.88.

System Analysis of Source Water Indicators at Drinking Water Production in the Central Water Supply System

2018 ◽  
Vol 16 (2) ◽  
pp. 84
Author(s):  
G A Blagodatsky ◽  
A A Bass ◽  
M M Gorokhov ◽  
D S Ponomarev
Keyword(s):  
Drinking Water ◽  
Water Supply ◽  
System Analysis ◽  
Supply System ◽  
Water Supply System ◽  
Source Water ◽  
Water Production ◽  
Drinking Water Production

Работа посвящена системному анализу данных показателей исходной воды при производстве питьевой воды в системе центрального водоснабжения крупного населенного пункта. На сегодняшний день на фоне увеличивающегося негативного антропогенного воздействия на окружающую среду наблюдается ухудшение состояния многих источников питьевого водоснабжения в широком спектре показателей, в частности, таких как органолептические свойства воды. Как следствие, возникает проблема и для питьевой воды. В работе приводится процесс подготовки данных о параметрах исходной воды, забираемой из водохранилища, которые ежемесячно (с 2002 по 2014 год) учитывались на предприятии при дезодорации воды. Приведенные параметры оказывают существенное влияние на органолептические свойства конечной воды. Подготовка данных для анализа проводится методом главных компонент К. Пирсона. Данные, полученные в пространстве R9, переводятся в пространство меньшей размерности R3. Понижение размерности позволяет снизить автокорреляцию между компонентами. Отбор компонент в пространство R3 проводится по правилу Парето. В пространстве R3 методом сферической кластеризации данных «Форель» с постоянным радиусом группировки проводится кластеризация. Приводится пошаговое визуальное представление алгоритма кластеризации в пространстве R3. В работе показано, что в данных показателях качества исходной воды имеются кластеры. Проводится корреляционно-регрессионный анализ данных, представленных в главных компонентах. Строятся регрессионные зависимости показателей органолептических свойств от главных компонент из пространства R3.

Divergent responses of diverse microalgae commonly found in drinking water source water to UV-C treatment

2021 ◽  
Author(s):  
Jordan Roszell ◽  
Po-Shun Chan ◽  
Brian Petri ◽  
Ted Mao ◽  
Kathleen Nolan ◽  
...  
Keyword(s):  
Drinking Water ◽  
Water Source ◽  
Drinking Water Source ◽  
Source Water ◽  
Uv C

Production of 2-Methyliso-Borneol by Two Benthic Cyanophyta

1983 ◽  
Vol 15 (6-7) ◽  
pp. 211-220 ◽  
Author(s):  
G Izaguirre ◽  
C J Hwang ◽  
S W Krasner ◽  
M J McGuire
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Drinking Water ◽  
Closed Loop ◽  
Water Supply Systems ◽  
Source Water ◽  
Analysis Method ◽  
Sediment Samples ◽  
Taste And Odor ◽  
Supply Systems

Two Oscillatoria strains have been isolated from three different water supply systems in California that have experienced taste and odor problems in their drinking water. The algae were obtained from sediment samples and rock scrapings from source-water reservoirs. Unialgal cultures, free of actinomycetes, were purged using the closed-loop stripping analysis method, and the resulting extracts were analyzed by gas chromatography and mass spectrometry. The organisms, Oscillatoriacurviceps and O.tenuis variant levis Gardner, yielded 2-methylisoborneol (MIB) at 60–150 µg/l. In both instances, MIB had previously been identified in the sediment samples from which the organisms were isolated. O.curviceps was implicated in a taste and odor episode involving MIB in a major reservoir during two consecutive summers.

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