Mixed Culture Microalgae Removal for Water Quality Improvement Using Chitosan

2020 ◽  
Author(s):  
Gulab Singh ◽  
S. K. Patidar
Keyword(s):  
Water Quality ◽  
Algal Biomass ◽  
Culture Medium ◽  
Mixing Time ◽  
Operational Parameters ◽  
Efficient Removal ◽  
Mixing Rate ◽  
Beneficial Uses ◽  
Improve Water Quality ◽  
Slow Mixing

The presence of microalgae affects water quality and beneficial uses of surface freshwaters. Chitosan with proven potential for harvesting specific microalgae species from their culture medium for producing biofuels and bioproducts appears promising for efficient removal of mixed microalgae species from surface freshwaters also. The main thrust of the present study was on removal of mixed microalgae species using chitosan as a coagulant to help improve water quality. Important operational parameters were optimized for economical microalgae removal. The microalgae cells, chlorophyll-a, TN and TP removal efficiency were 82.06, 89.90, 69.32 and 44.01%, respectively at an optimum chitosan dose of 10 mg/L, pH 8, slow mixing time 7 min, slow mixing rate 30 rpm and settling time of 15 min. The results have shown that chitosan coagulation efficiently removed the mixed microalgae species from surface freshwater with significant improvement in water quality and recovery of algal biomass for other beneficial applications.

Application of Lime and Alum to Stormwater Retention Lakes to Improve Water Quality

1992 ◽  
Vol 27 (2) ◽  
pp. 365-382 ◽  
Author(s):  
J. Babin ◽  
E. E. Prepas ◽  
Y. Zhang
Keyword(s):  
Water Quality ◽  
Algal Biomass ◽  
Algal Growth ◽  
Open Water ◽  
Buffering Capacity ◽  
Point Sources ◽  
Filamentous Algae ◽  
Chemical Treatments ◽  
Improve Water Quality ◽  
Stormwater Retention

Abstract Urban stormwater retention lakes receive enormous amounts of nutrients from point (sewers) and non-point (domestic runoff) sources. Water quality in these lakes is poor and characterized by: 1) high phosphorus concentrations and algal biomass, 2) poor buffering capacity (alkalinity as low as 60 mg/L as CaCO3); and 3) high pH (often greater than 9). Thus chemical treatments which alter pH will have to be carefully considered. Recently, we used lime (Ca(OH)2) and/or alum (Al2(SO4)3·14H2O) to reduce phosphorus concentrations in the water column and precipitate out particulate matter. Of the two chemical treatments, we found that a lime/alum mixture was better at controlling macrophytes and shoreline filamentous algae, but alum was better at controlling planktonic algal growth and turbidity. A combination of both chemicals, lime which elevates pH and alum which lowers pH, is used to maintain pH within a desirable range (6-10). Overall water quality can be improved through the application of alum/lime mixtures, however, these applications will have to be applied routinely throughout the open-water season due to continuous inputs of nutrients from point- and non-point sources.

scholarly journals PENERAPAN TEKNOLOGI BUDIDAYA IKAN LELE BIOFLOK SEBAGAI UPAYA PENINGKATAN PENDAPATAN MASYARAKAT DI DESA PANDAN ARANG, KABUPATEN OGAN ILIR

2021 ◽  
Vol 5 (1) ◽  
pp. 75
Author(s):  
Madyasta Anggana Rarassari ◽  
Marini Wijayanti ◽  
Sefti Heza Dwinanti ◽  
Retno Cahya Mukti ◽  
Danang Yonarta
Keyword(s):  
Water Quality ◽  
Culture Medium ◽  
Optimal Growth ◽  
Nutrient Utilization ◽  
Transfer Of Knowledge ◽  
Absolute Weight ◽  
The Public ◽  
Biofloc Technology ◽  
Absolute Length ◽  
Improve Water Quality

Biofloc Technology (BFT) menjadi salah satu teknologi alternatif dalam akuakultur yang bertujuan untuk memperbaiki kualitas air dan meningkatkan efesiensi pemanfaatan nutrisi. Tujuan dari Pengabdian Kepada Masyarakat ini adalah untuk memperkenalkan dan memberikan informasi kepada masyarakat dan petani tentang budidaya ikan Lele dengan sistem bioflok. Kegiatan ini dilakukan di Desa Pandan Arang, Kabupaten Ogan Ilir dengan menggunakan metode pemberdayaan partisipati aktif kelompok pembudidaya ikan pada mitra yang diajak kerjasama dengan transfer ilmu dan teknologi, meliput beberapa tahapan yaitu: 1) Persiapan; 2) Penyuluhan pembuatan pakan dan budidaya ikan; 3) Pembuatan demplot dan pendampingan; 4) Evaluasi dan pembuatan laporan hasil kegiatan. Hasil yang didapat bahwa kegiatan budidaya ikan lele dengan menerapkan sistem bioflok memberikan hasil dapat memperbaiki kualitas air pada budidaya ikan lele, terutama dalam menurunkan nilai ammonia dalam media budidaya. Serta memberikan pertumbuhan optimal pada ikan lele dengan bobot mutlak 8,4 gram/ekor dan pertumbuhan panjang mutlak 8,6 cm/ekor. Kata kunci: Biofloc Technology, Ikan Lele, Desa Pandan Arang, Budidaya Ikan ABSTRACT Biofloc Technology (BFT) is an alternative technology in aquaculture that aims to improve water quality and increase the efficiency of nutrient utilization. The purpose of this social dedication are to introduce and provide information to the public and farmers with biofloc system. This activity is carried out in Pandan Arang Village, Ogan Ilir District with an active participatory empowerment method for farmers fish in partners who are invited to collaborate with the transfer of knowledge and technology, covering several stages, 1) preparation; 2) counseling for feed and fish cultivation; creating demonstration plots and assistance; 4) evaluation and making reports on the results of activities. The results showed that catfish culture using the biofloc technology could improve water quality in catfish aquaculture, particularly in reducing the value of ammonia in the culture medium. As well as providing optimal growth in catfish witn an absolute weight of 8,4 gr and absolute length growth of 8,6 cm. Keywords: Biofloc Technology, Catfish, Pandan Arang Village, Aquaculture

Improvement of Dewatering Characteristics of Aerobically Digested Sludges

1993 ◽  
Vol 28 (1) ◽  
pp. 47-51 ◽  
Author(s):  
Hasan Z. Sarikaya ◽  
Salah Al-Marshoud
Keyword(s):  
Linear Relationship ◽  
Mixing Time ◽  
Optimal Dose ◽  
Optimum Dose ◽  
Cationic Polymers ◽  
Operational Parameters ◽  
Capillary Suction ◽  
Solids Concentration ◽  
Slow Mixing ◽  
Aerobically Digested

The aim of this study was to evaluate the influence of both sludge characteristics and operational parameters on polymer selection and optimal dose requirements to improve the dewatering characteristics of aerobically digested sludges of a contact stabilization activated sludge plant in Jeddah, Saudi Arabia. In order to determine the dewatering characteristics of the sludge samples, capillary suction time (CST) and specific resistance to filtration (SRF) were measured. Cationic conditioning polymers were found more effective than the anionic types. The optimum polymer dose was equal to 4.2 kg of polymer/ton of dry matter for three of the cationic polymers used in this study namely Zeetag 57, Superfloc C420, and Zeetag 92. The optimum dose requirements are increased substantially with increasing pH values. A linear relationship was found between the optimal polymer dose in mg/l and the sludge solids concentration. The optimum total mixing time was found to be 2 min: 30 sec of rapid mixing at 100 rpm and 90 sec of slow mixing at 40 rpm. The sludge temperature variations were found to have a slight effect on polymer dose requirements. A linear relationship was obtained between the CST and SRF with a correlation coefficient of 0.99.

Marine water quality management in South Africa

1995 ◽  
Vol 32 (2) ◽  
pp. 281-288
Author(s):  
Susan Taljaard ◽  
Willem A. M. Botes
Keyword(s):  
South Africa ◽  
Water Quality ◽  
Quality Management ◽  
Water Quality Management ◽  
Management Plan ◽  
Specific Reference ◽  
Information Requirements ◽  
Water Quality Guidelines ◽  
Quality Guidelines ◽  
Beneficial Uses

In South Africa the ultimate goal in water quality management is to keep the water resources suitable for all “beneficial uses”. Beneficial uses provides a basis for the derivation of water quality guidelines, which, for South Africa, are defined in Water quality guidelines for the South African coastal zone (DWAF, 1991). The CSIR has developed a practical approach to marine water quality management, taking into account international trends and local experience, which can be applied to any coastal development with potential influence on water quality. The management plan is divided into three logical components, i.e. • site-specific statutory requirements and environmental objectives; • system design with specific reference to influences on water quality; and • monitoring programmes. Within this management approach water quality issues are addressed in a holistic manner, through focused procedures and clear identification of information requirements. This paper describes the procedures and information requirements within each component of the water quality management plan, with specific reference to marine disposal systems. Ideally, the management plan should be implemented from the feasibility and conceptual design phase of a development and the timing of the different procedures within the development process are therefore also highlighted. However, the logical lay-out of procedures allows for easy initiation (even to existing disposal system) at any stage of development.

Monitoring effluent quality in hypertrophic wastewater reservoirs using remote sensing

1996 ◽  
Vol 33 (8) ◽  
pp. 23-29 ◽  
Author(s):  
I. Dor ◽  
N. Ben-Yosef
Keyword(s):  
Water Quality ◽  
Theoretical Model ◽  
Principal Component ◽  
Cost Effective ◽  
Operational Parameters ◽  
Effluent Quality ◽  
Optical Images ◽  
Routine Monitoring ◽  
Cost Effective Method ◽  
Wastewater Quality

About one hundred and fifty wastewater reservoirs store effluents for irrigation in Israel. Effluent qualities differ according to the inflowing wastewater quality, the degree of pretreatment and the operational parameters. Certain aspects of water quality like concentration of organic matter, suspended solids and chlorophyll are significantly correlated with the water column transparency and colour. Accordingly optical images of the reservoirs obtained from the SPOT satellite demonstrate pronounced differences correlated with the water quality. The analysis of satellite multispectral images is based on a theoretical model. The model calculates, using the radiation transfer equation, the volume reflectance of the water body. Satellite images of 99 reservoirs were analyzed in the chromacity space in order to classify them according to water quality. Principal Component Analysis backed by the theoretical model increases the method sensitivity. Further elaboration of this approach will lead to the establishment of a time and cost effective method for the routine monitoring of these hypertrophic wastewater reservoirs.

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