Print ISSN: 1813-0526

Online ISSN: 2220-1270

Main Subjects : Environmental Engineering

The Situation Of Water Treatment Plant In Mosul City

Musab Abduljabbar al-tamir

Al-Rafidain Engineering Journal (AREJ), 2019, Volume 24, Issue 2, Pages 138-145
DOI: 10.33899/rengj.2019.164330

The present paper dealt with the evalution of quantiy and qualtiy of water treatmetn plants WTPs withen Mosul city. According to the total productivity of WTPs the per capita share of water was 785 L/d, and after subtracting the losses and violation upon the water supply network that reaches upto 50% the per capita portion of water becomes 392 L/d. For the quality of water; the study revealed that there are a segnificant effect of the WTPs processes upon the water quality parameters of the product water comparing with the raw water, and the quality of product water is withen the Iraqi dirnking water spicifications regarding to the parameters taken into account withen the study. This study concentric to the turbidity removal by WTPs because these plants are designed to reduce the turbidity of water to acceptable levels withen the Iraqi specification. turbidity of water is out of the specification in 13% of the samplise with different portions through the WTPs, but the highst was at aldanadan and alsaheroon plants.
Duncn test revealed that there are a significant different betweent the average of the residual turbidity and  between the average of percentage removal of turbidity between WTPs and the worest plant from the residual turbidity are alsaheroon, alghzlani and aldanadan. And the woreste plant from the percent turbidity removal are alaiser aljadeed and alaiser altawsie.

Evaluating the Performance of the A2O System for Removing Nutrients from Municipality Wastewater

Saja Abd al-Razzaq Mohammed; Ammar Thamir Hamad

Al-Rafidain Engineering Journal (AREJ), 2019, Volume 24, Issue 2, Pages 12-24
DOI: 10.33899/rengj.2019.164334

Nitrogen and phosphorus are essential for the growth of micro-organisms used in wastewater treatment. When a treatment system is designed to remove a quantity of nutrients، larger than the ordinary metabolism requirements of bio-cell، the operation is called biological nutrient removal BNR. The BNR system consists of two processes: the biological nitrogen removal and the enhanced biological phosphorus removal (EBPR). There are several arrangements for biological nutrient removal processing. The selection of the suitable treatment scheme depends on the characteristics of the raw wastewater، quality of treated effluent required and the economical consideration. Several studies showed that the A2O system is the most suitable among different configurations because of its simplicity in operation، low oxygen requirements (i.e. low operational cost)، high efficiency of nutrient removal and a good settling characteristics of the sludge produced. A continuously flow laboratory scale of A2O was used in the current study. A raw municipal wastewater from the environmental engineering department is flowing at a rate of 0.6ml/sec. The mean cell residence time was 12 days. The experiments were conducted under three different internal cycle ratios (IR) and three returned activated sludge ratios، The effective sizes of the anaerobic، anoxic and aerobic compartments were 6.4، 8.65 and 17.21 L respectively، The results showed that the percentages of internal cycle ratio have a significant effect on the process of biological removal of nitrates while the percentage of returned activated sludge (RAS) has a significant impact on the biological removal of phosphorus. The A2O system removal efficiency of COD، orthophosphate and ammonia were: 85.7%، 93.5%، and 92.4%، respectively. The effluent quality is within the Iraqi standards with respect to organic and nutrients contents.

Laboratory Study of Flow Characteristics Through three Baffle – Sluice Gates.

Duaha A. Al-mallah; Hana A. Hayawi

Al-Rafidain Engineering Journal (AREJ), 2019, Volume 24, Issue 1, Pages 1-9
DOI: 10.33899/rengj.2019.163195

The main objective of this study is to investigate the experimentally the coefficient of discharge for three baffle sluice gates and compared with single gate. The channel slope was changed tow times (0, 0.0075). For this purpose three baffle sluice gates were made from fibber class with (1cm) thick, (30cm) wide and (15,25,30)cm height for first, second and third gate respectively. The three gates have been sharp edge from the top and bottom with 2mm thick .The distance between the three parallel baffle gates were changed three times (2, 3.5, 5) cm. The analysis of results showed that discharge coefficient Cd in horizontal channel is larger than its value in inclined channel with direction of flow and the change in space between gates didn't cause an important difference between values of discharge coefficient Cd. The values of Cd were between          (0.561 -0.736) for horizontal channel and three gates, while when the channel inclined the values of Cd were between (0.523-0.662) for three gates.