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Purification of wastewater by Algae | ||
| journal of the college of basic education | ||
| Article 1, Volume 10, Issue 51, 2007, Pages 41-54 | ||
| Author | ||
| Wisam J. Al-Hilo | ||
| Abstract | ||
| Purification of wastewater by AlgaeAbstractThe two micro algae chlorella & Scenedesmus were used in purification of wastewater with investment of sludge bacteria existing in the same water.The two algae were isolated from Tigris river startly them grown in medium prepared in the lab independent on the water of the river as a basic medium in order to use these growths as algal inoculums in the later experiments.These algae were tried to grow on the samples of wastewater in Baghdad to produce a biomass utilized as a source of food and feed. Lab experiments were achieved to study the effect of temperature, conc. of salt and shaking period on the extraction of protein taken from the mass of algal growth.The conc. of NaCl = 0.6M gave a high protein percentage 52% among the other molar concentrations studied (0.2, 0.4, 0.6, 0.8, 1.0M). The Temperature 40Co gave a higher protein percentage 51% among the other temperature degrees studied ( 20, 25,30,35,40,45 Co ), then the shaking period 12h gave a high percentage protein 55% among the periods studied (3,6,12,18,24,).The 55% protein was the highest value in the all experiments applied in this study.A field experiments were worked to clearance the wastewater and storage it in precipitation pool then in the primary settling basin, then to accelerating pool, finally to the secondary clarifier pool. Chemical Oxygen Demand (COD) was determined in these pools to point the properties of wastewater , COD value decrease from 697 mg/L in the wastewater before enter first pool to 61 mg/L in the final pool treatment. The algae were concentrated in the secondary clarifier pool then were isolated and analyzed to determine the crude protein % content as 49.8% this protein percentage was qualified the protein in the eggs and beef, which to encourage to use these algae in food and feed. Also they contained 2.3% as phosphate and other important minerals.The efficiency of the pool of treatment in purification of wastewater. BOD was determined which found decreased from 140 mg/L before the first pool to 9 mg/L after the treatment. In this way the efficiency was 93.6% as BOD removal. This efficiency was higher than three times of the BOD standard value worldly 30 mg/L. These treatments improved the advantage in the purification of wastewater and could reuse it in purposes of irrigation and drinking. | ||
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