Impact of filamentous cyanobacteria on the water quality of two tropical reservoirs

ABSTRACT Artificial lakes play an important role in water availability in tropical semi-arid Northeastern Brazil. However, in addition to the negative effects that dams have on the water quality of rivers, other practices such as discharge of untreated wastewater, intensive crop fertilization and fish farming have been contributing to water quality deterioration. Climate change may be another driver of water quality decrease. Increases in precipitation and drought intensities as well as temperature increase may redefine the dynamics of planktonic communities and favour species more adapted to the new environment. Water samples were collected in two reservoirs selected based on the recurrence of positive results for saxitoxins, Acarape do Meio (AM) and Sitios Novos (SN). In general, diversity in SN (1.08) was higher than in the AM (0.60). Phytoplankton dynamics in these reservoirs differ from other reservoirs in the same region of Brazil, in the sense that filamentous cyanobacteria are dominant. Furthermore, lower diversity, concentration and richness of chlorophyceae and bacillariophyceae were found in both reservoirs. Increase in diversity was observed during the intense rainy season of 2011, suggesting a slight improvement of water quality. A close inverse correlation between Cylindrospermopsis sp and other cyanobacteria was found in SN (R2= –0.862) and in AM (R2= –0.997) and the data collected demonstrates that a season with intensive rainfall may lead to lower cyanobacteria concentrations probably due to water dilution and higher flushing rates.

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The Water Quality Management for Recirculating Aquaculture System by Applying Nano Adsorption Technology

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2021.19202 ◽

2021 ◽

Vol 21 (7) ◽

pp. 3975-3979

Author(s):

Min-Jin Hwang ◽

Jeongmin Cha ◽

Eun-Sik Kim

Keyword(s):

Water Quality ◽

Water Quality Management ◽

Reduction Rate ◽

Fish Farming ◽

Analytical Relationship ◽

Pumice Stone ◽

Recirculating Aquaculture ◽

Recirculating Aquaculture Systems ◽

Aquaculture Water

In a fish farm, the water quality is important to ensure fish growth and farm productivity. However, the study of the quality of water using in aquaculture has been ignored until now. Although there are several methods to treat water, nanomaterials have not yet been applied for indoor fish farming because it may difficult to supply a sufficient amount of water, and the operating parameters have not been developed for recirculating aquaculture systems. Nanotechnology can be applied to treat water, specifically through adsorption and filtration, to produce drinking water from surface water and to treat wastewater by processing a high volume of effluent. The adsorption and filtration of seawater has also progressed to allow for desalination of seawater, and this is recognized as a necessary tool for extended treatment protocols of various types of seawater. This study investigated the treatment of aquaculture water using nano-porous adsorbents (e.g., pumice stone) to control the contaminants in seawater in order to maintain the water quality required for aquaculture. The results are used to derive an analytical relationship between the ionic species in aquaculture water, and this provides empirical parameters for a batch reactor for aquaculture. The quality of the influent and effluent for aquaculture is compared using time-series analyses to evaluate the reduction rate of ionic components and thus suggest the optimum condition for fish farming using bioreactor processes.

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ANALISIS KESESUAIAN PERAIRAN UNTUK BUDIDAYA IKAN KERAPU MACAN (Epinephelus fuscoguttatu) DI PERAIRAN PULAU TEGAL KECAMATAN TELUK PANDAN KABUPATEN PESAWARAN

e-Jurnal Rekayasa dan Teknologi Budidaya Perairan ◽

10.23960/jrtbp.v6i2.p705-712 ◽

2018 ◽

Vol 6 (2) ◽

pp. 705 ◽

Cited By ~ 1

Author(s):

Glenn Valentino ◽

Abdullah Aman Damai ◽

Herman Yulianto

Keyword(s):

Water Quality ◽

Secondary Data ◽

Fish Farming ◽

Primary Data ◽

Marine Aquaculture ◽

Quality Of Waters ◽

Epinephelus Fuscoguttatus ◽

Tiger Grouper ◽

Physical And Chemical

Tiger grouper is a marine aquaculture commodities that has good prospects to be developed. One of the areas that could potentially be used as a place of tiger grouper fish farming is the Tegal Island, Pesawaran. The purpose of this research was to analyze the level of water quality for fish farming tiger grouper (Epinephelus fuscoguttatus). This research was carried out in March-May 2017 descriptive analytic nature by doing the observations on the quality of waters which include physical and chemical parameters. The data that used in this research sourced from primary data about the suitability waters of the island while the secondary data is form in research location maps. There were 4 sampling stations which determined with global positioning system (GPS). The results showed that the water quality which is owned by the island's waters on station 1, 2, 3 and 4 were in the quite appropriate category for the cultivation of tiger grouper.

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Water Quality of Lake Iskanderkul and Its Tributaries

Central Asian Journal of Water Research ◽

10.29258/cajwr/2020-r1.v6-2/79-88.eng ◽

2020 ◽

Vol 6 (2) ◽

pp. 79-88

Author(s):

Z.O. Normakhmedova ◽

◽

A.V. Mitusov

Keyword(s):

Water Pollution ◽

Water Quality ◽

Chemical Composition ◽

Fish Farming ◽

Natural Phenomena ◽

Change Dynamics ◽

Chemical Composition Of Water ◽

Study Results ◽

Copper Zinc

This article presents the study results of the change dynamics in the chemical composition of water in Lake Iskanderkul and the rivers flowing into it, as well as the comparison of water quality in the water bodies of the Iskanderkul Basin and several mid-stream tributaries of the Zarafshan River. It was established that the chemical composition of water in Lake Iskanderkul and its tributaries meets the requirements of the corresponding state standard (GOST 2874-82 “Drinking Water”). However, in terms of dissolved oxygen, copper, zinc, lead and iron the water in Lake Iskanderkul does not satisfy fish farming requirements. The main water pollution sources in the area include such natural phenomena as floods, avalanches, mudslides, and rock dissolution.

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Evaluating the Water Quality of Olive Orchards and Negative Effects of Agriculture on Environment

Asian Journal of Water Environment and Pollution ◽

10.3233/ajw-180029 ◽

2018 ◽

Vol 15 (2) ◽

pp. 171-176

Author(s):

Ali Ajili Lahiji

Keyword(s):

Water Quality ◽

Negative Effects

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Correction to: Degradation of the macro-drainage water quality of an urban basin in Northeastern Brazil

Environment Development and Sustainability ◽

10.1007/s10668-020-00830-x ◽

2020 ◽

Author(s):

Iana Chaiene de Araujo Vidal ◽

Rui de Oliveira ◽

Mônica de Amorim Coura ◽

Andréa Carla Lima Rodrigues ◽

Francisco das Chagas da Costa Filho ◽

...

Keyword(s):

Water Quality ◽

Drainage Water ◽

Northeastern Brazil

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Are Preferences for Water Quality Different for Second-Home Residents?

Tourism Economics ◽

10.5367/000000009789036620 ◽

2009 ◽

Vol 15 (3) ◽

pp. 629-651 ◽

Cited By ~ 8

Author(s):

Catalina M. Torres ◽

Antoni Riera ◽

Dolores García

Keyword(s):

Water Quality ◽

Environmental Quality ◽

Coastal Area ◽

Inverse Correlation ◽

Water Transparency ◽

Second Home ◽

New Type ◽

Key Variables ◽

Recreational Use

The latest trends in tourism indicate the emergence of a new segment of visitors looking for accommodation in private residences. The increase in second-home residents has led to efforts to improve knowledge of the preferences of this new type of tourist in those destinations where their presence is considerable. As one of the key variables affecting the choice of residential tourists is the environmental quality of the area, this paper focuses on testing for the existence of an inverse correlation between the loss of coastal water transparency, viewed as a measure of environmental quality, and beach aesthetics in Santa Ponça Bay, a Mallorcan coastal area containing two urban beach zones of intensive recreational use, where the proportion of second-home residents is high. The results show that the willingness to pay for improvements in water transparency diminishes in a non-linear way when transparency deteriorates, resulting in no statistically significant differences between first- and second-home residents.

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Seasonal Changes and Spatial Variation in Water Quality of a Large Young Tropical Reservoir and Its Downstream River

Journal of Chemistry ◽

10.1155/2017/8153246 ◽

2017 ◽

Vol 2017 ◽

pp. 1-16 ◽

Cited By ~ 10

Author(s):

Teck-Yee Ling ◽

Norliza Gerunsin ◽

Chen-Lin Soo ◽

Lee Nyanti ◽

Siong-Fong Sim ◽

...

Keyword(s):

Water Quality ◽

Aquatic Organisms ◽

Organic Pollution ◽

Wet Season ◽

Tropical Reservoir ◽

Different Depths ◽

Dry Seasons ◽

Water Quality Deterioration ◽

Wet And Dry Seasons

This study examined the water quality of the large young tropical Bakun hydroelectric reservoir in Sarawak, Malaysia, and the influence of the outflow on the downstream river during wet and dry seasons. Water quality was determined at five stations in the reservoir at three different depths and one downstream station. The results show that seasons impacted the water quality of the Bakun Reservoir, particularly in the deeper water column. Significantly lower turbidity, SRP, and TP were found during the wet season. At 3–6 m, the oxygen content fell below 5 mg/L and hypoxia was also recorded. Low NO2--N, NO3--N, and SRP and high BOD5, OKN, and TP were observed in the reservoir indicating organic pollution. Active logging activities and the dam construction upstream resulted in water quality deterioration. The outflow decreased the temperature, DO, and pH and increased the turbidity and TSS downstream. Elevated organic matter and nutrients downstream are attributable to domestic discharge along the river. This study shows that the downstream river was affected by the discharge through the turbines, the spillway operations, and domestic waste. Therefore, all these factors should be taken into consideration in the downstream river management for the health of the aquatic organisms.

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EFFECTS OF DREDGING ON DOWNSTREAM WATER QUALITY: EKOLE CREEK, NIGERIA

International Journal of Engineering Technologies and Management Research ◽

10.29121/ijetmr.v8.i12.2021.1078 ◽

2021 ◽

Vol 8 (12) ◽

pp. 17-25

Author(s):

Opololaoluwa Oladimarum Ogunlowo ◽

Churchill Ebinimitei Simon

Keyword(s):

Heavy Metals ◽

Water Quality ◽

Electrical Conductivity ◽

Drinking Water ◽

Suspended Solids ◽

Total Dissolve Solid ◽

Total Suspended Solids ◽

Negative Effects ◽

Downstream User

Water is essential part of ecosystem, so its quality must be ascertained for use especially in Ekole creek of Nigeria where dredging activities is heavy, hence this study examined the dredging effect on the downstream water quality of Ekole creek. Water samples were collected from four points which are; Upstream, Dredge I, Dredge II, and Downstream points. The parameters of the water quality determined showed that Turbidity and Total Suspended Solids (TSS) were higher at the Downstream point with values of 31 NTU and 1664 mg/l respectively; pH was also slightly acidic (6.61); but low in Total Dissolve Solid (TDS), Electrical Conductivity, Nitrate (NO3) and Dissolved Oxygen (DO), as compare to the Upstream. The values of the heavy metals like Pb (3.845 mg/l), Cr (0.612 mg/l) Ni (0.104 mg/l) and Cu (0.128 mg/l), at Downstream point, were above Pb (3.0605 mg/l), Cr (0.0 mg/l), Ni (0.017 mg/l) and Cu (0.102 mg/l) of the Upstream point,before the Dredging points I and II, that have correlative matrix of(Pb>Fe>Mn>Zn>Cu>Ni>Cr) and Pb>Fe>Cr>Mn>Zn>Cu>Ni Downstream point. Is discovered the Downstream water is slightly acidic, high in Turbidity and TSS, but low in TDS, EC, NO3 and DO, as against the WHO drinking-water quality, due the effect of dredging on the water quality of the Ekole Creek. It is inferred that the dredging activities have negative effects on the water quality, which can be hazardous to the health of downstream user, and distort the ecosystem; therefore the commercial dredging activities should be checked in Ekole creek.

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