Wastewater Tertiary Treatment Using of Oxidation Ponds

The decrease in Egypt and #039;s share of the Nile River in lasted years led to an increase in the interest in wastewater treatment in Egypt for re-use in various purposes as compensation for the waters of the Nile. One of these methods was oxidation ponds that followed extended aeration in wastewater treatment plant in Rshid village, El-Behera governorate, Egypt. The results showed that BOD, COD and TSS were reduced in first and third cases after passing through oxidation pond, while they were increased in the second case then decreased after filtration. Also the data showed that the most percentage removal of BOD, COD and TSS was 67.4%, 61.9% and 54.5% respectively and were recorded in second case. The COD/BOD ratio for influent of wastewater under consideration was in the range of 1.6-1.94 indicating that the organic matter in influent wastewater has low biodegradability or its decomposition is low, and also this wastewater not contain volatile fatty acids. The results of the treatment also showed that the wastewater under consideration could be used in many agricultural varieties. The values of COD, BOD, TSS and DO of effluent wastewater for the three cases under consideration are found to be less than the recommended level in wastewater as listed by World Health Organization and within limits according to law 48/82.