The use of polyaluminium chloride as a restoration measure to improve water quality in tropical shallow lakes

Abstract Aim The aim of this study was to evaluate the performance of the coagulant Polyaluminium chloride (PAC) in water quality improvement of six eutrophic shallow lakes in Brazilian semiarid region. Methods We evaluated the effect of PAC in turbidity, humic substances (UV254), total phosphorus and chlorophyll-a concentration through laboratory jar tests. Results The results showed that PAC had a good performance in reducing total phosphorus concentrations and turbidity, with a reduced efficiency in removing chlorophyll-a and humic substances by sedimentation of flocks formed. Conclusions Addition of PAC is a potential tool for water quality improvement of eutrophic shallow lakes in Brazilian semiarid region but its efficiency depends on the pH and particulate and dissolved organic matter concentration in the lake or reservoir water.

Download Full-text

Effects of Anodonta woodiana on water quality improvement in restoration of eutrophic shallow lakes

Journal of Lake Sciences ◽

10.18307/2018.0612 ◽

2018 ◽

Vol 30 (6) ◽

pp. 1610-1615 ◽

Cited By ~ 2

Author(s):

WU Zhongkui ◽

◽

QIU Xiaochang ◽

ZHANG Xiufeng ◽

LIU Zhengwen ◽

...

Keyword(s):

Water Quality ◽

Quality Improvement ◽

Shallow Lakes ◽

Water Quality Improvement ◽

Anodonta Woodiana ◽

Eutrophic Shallow Lakes

Download Full-text

Possibilities of restration in eutophic shallow lakes and ponds by artificial plants: A scenario of lake shore restration based on field experiments for water quality improvement using artificial plants.

Journal of Japan Society of Civil Engineers Ser G (Environmental Research) ◽

10.2208/jscejer.67.ii_523 ◽

2011 ◽

Vol 67 (6) ◽

pp. II_523-II_528

Author(s):

Tetsuya OISHI ◽

Yukio ONODA ◽

Yuichi KAYABA

Keyword(s):

Water Quality ◽

Quality Improvement ◽

Shallow Lakes ◽

Field Experiments ◽

Water Quality Improvement ◽

Lake Shore ◽

Shallow Lakes And Ponds

Download Full-text

In Situ and Satellite Observation of CDOM and Chlorophyll-a Dynamics in Small Water Surface Reservoirs in the Brazilian Semiarid Region

10.20944/preprints201711.0075.v1 ◽

2017 ◽

Author(s):

Christine Coelho ◽

Birgit Heim ◽

Saskia Förster ◽

Arlena Brosinsky ◽

José Carlos De Araújo

Keyword(s):

Water Quality ◽

Chlorophyll A ◽

Quality Parameters ◽

Water Quality Parameters ◽

Semiarid Region ◽

Landsat 8 ◽

Small Surface ◽

Entire Study ◽

Chl A ◽

Brazilian Semiarid

We aimed at analyzing Chlorophyll-a and CDOM dynamics from field measurements and at assessing the potential of multispectral satellite data for retrieving water-quality parameters in three small surface reservoirs in the Brazilian semiarid region. More specifically, this work comprises i) analysis of Chl-a and trophic dynamics; ii) characterization of CDOM; iii) estimation of Chl-a and CDOM from OLI/Landsat-8 and RapidEye imagery. The monitoring lasted 20 months within a multi-year drought, which contributed to water-quality deterioration. Chl-a and trophic state analysis showed a highly eutrophic status for the perennial reservoir during the entire study period, while the non-perennial reservoirs ranged from oligotrophic to eutrophic, with changes associated with the first events of the rainy season. CDOM characterization suggests that the perennial reservoir is mostly influenced by autochthonous sources, while allochthonous sources dominate the non-perennial ones. Spectral-group classification assigned the perennial as CDOM-moderate and highly eutrophic reservoir, whereas the non-perennial ones were assigned as CDOM-rich and oligotrophic-dystrophic reservoirs. The remote sensing initiative was partially successful: the Chl-a was best modelled using RapidEye for the perennial; whereas CDOM performed best with Landsat-8 for non-perennial reservoirs. This investigation showed high potential for retrieving water quality parameters in dry areas with small reservoirs.

Download Full-text

Influence of extended drought on water quality in tropical reservoirs in a semiarid region

Acta Limnologica Brasiliensia ◽

10.1590/s2179-975x2214 ◽

2015 ◽

Vol 27 (1) ◽

pp. 15-23 ◽

Cited By ~ 17

Author(s):

Gustavo Girão Braga ◽

Vanessa Becker ◽

José Neuciano Pinheiro de Oliveira ◽

Jurandir Rodrigues de Mendonça Junior ◽

Anderson Felipe de Medeiros Bezerra ◽

...

Keyword(s):

Water Quality ◽

Chlorophyll A ◽

Suspended Solids ◽

Algal Growth ◽

Freshwater Ecosystems ◽

Semiarid Region ◽

Drought Period ◽

Tropical Reservoirs ◽

Quality Degradation ◽

Brazilian Semiarid

AimDrought periods often occur in Brazilian semiarid region and are supposed to induce water quality degradation by changes in physical, chemical and biological properties of freshwater ecosystems. Reservoirs in this region are used as drinking-water supplies and are exposed to wide volume fluctuations during drought periods due to lack of precipitation and high evaporation rates. This study aimed to identify patterns on water quality of two reservoirs during a long drought period. It was expected that more arid and shallower conditions would favor algal growth by enhancing nutrient availability, causing a decrease on water quality.MethodsThe study was based on monthly sampling over 20 months (May 2011 to December 2012) at two tropical reservoirs on Brazilian semiarid region. Precipitation and volume data were obtained from environmental agencies. Transparency was measured on field using a Secchi disk and conductivity, nutrients, suspended solids and chlorophyll-a were analyzed on laboratory. Temporal changes in all environmental variables were analyzed in each reservoir using two-way cluster analysis and also principal component analysis (PCA).ResultsThe volume of both reservoirs decreased considerably over the study because of low or shortage of precipitation. It was possible to detect two opposite patterns of chlorophyll-a in each reservoir throughout the drought season: in the first one phytoplankton growth was favored, while in the second one chlorophyll-a decreased by high inorganic turbidity. Both reservoirs tended to increase their turbidity and conductivity during the drought period due to shallow conditions, which probably contributed to sediment resuspension.ConclusionsWater level reduction during the extended drought period, contributed for water quality degradation due to high algal biomass and also high turbidity found during drought period. Local factors, as the nature of suspended solids, play an important role on predicting water quality.

Download Full-text