Abstract
A program has been conducted to monitor the algal counts and disinfection by-products (DBPs) during conventional treatment of raw water in four drinking water treatment plants (DWTPs) located in Greater Cairo. Besides, all factors that affect DBPs formation were measured. Phytoplankton structure of the Nile River water was composed of diatoms, green and blue- green algae. Percentage composition of algal species was in the order: diatoms >green algae > blue-green algae. Algal composition of the treated water was subjected to wide variation after clarifier and sand filtration. Diatoma elongatum, Cyclotella comta (diatoms) Scenedesmus quadricauda, Ankistrodesmus acicularis (green algae) and Merismopedia elegans (blue- green algae) were detected in the final outlet water indicating that the studied four DWTPs were not effective in the algal removal. In addition, the studied DWTPs were relatively not very effective in removal of total organic carbon (TOC) since the maximum removal percentage was 32.41% at Embaba DWTP, and hence residual TOC led to the formation of DBPs. However, the concentrations of TTHM in the four drinking water treatment plants were all below the Egyptian standards for Drinking Water Quality (100 μg/L). The proportion of chloroform to the four THMs accounted for up to 50%, and the four THMs species were in the order of chlorofom > dichlorobromomethane > dibromochloromethane > bromoform. Whereas, the concentrations of HAA species followed the order: monochloroacetic acid >dichloroacetic acid >trichloroacetic acid >monobromoacetic acid (MBAA).
| Original language | English |
|---|---|
| Pages (from-to) | 5504-5511 |
| Number of pages | 8 |
| Journal | Journal of Applied Sciences Research |
| Volume | 8 |
| Issue number | 11 |
| State | Published - Nov 2012 |
Keywords
- Algae
- Disinfection by-products (dbps)
- Greater Cairo
- Occurrence