The ethanol, chloroform and acetone extracts of five species from Acacia (Acacia albidia stems, Acacia mellifera aerial parts, Acacia nubica aerial parts, Acacia seyal var. seyal stems and Acacia tortilis aerial parts) were investigated for their antimicrobial activity against two standard bacterial strains of Gram +ve bacteria (Staphylococcus aureus (ATCC 25923)), Gram −ve bacteria (Pseudomonas aeruginosa (ATCC 27853)) and standard fungi Candida albicans (ATCC 90028) using the agar-plate well diffusion method. The chloroform extract was inactive compared to ethanol and acetone extracts. But ethanol extracts showed the maximum antimicrobial activity against the test organism. Amongst the plant species screened, ethanol extract of Acacia seyal stems showed maximum inhibitory activity (38 mm) and (37 mm) against Staphylococcus aureus and Candida albicans, respectively. The ethanol, chloroform and acetone extracts of Acacia mellifera (aerial parts) did not show any activity against the test organisms. Cholorophorm and acetone extracts via DPPH, the radical scavenging activities were found to be 91 ± 0.03, 88 ± 0.01 and 85 ± 0.04, respectively. The results of phytochemical screening showed that all extracts of studied plant contain flavonoids, saponins, terpenoids, steroids, alkaloids, phenols and tannins. H. B. Abdllha et al.

The chlorine industry sludge (CLS), which is a solid by-product resulted from the chlorine industry plants, is successfully applied as an effective adsorbent for removal of the heavy metal ions. CLS was activated by grinding to about 10 μm particle size and burned to 700 o C for 3 h (ACLS) The physicochemical characteristics of CLS and ACLS were investigated using X-ray diffraction (XRD), scanning electron microscope (SEM) coupled with energy dispersed X-ray analysis (EDX) unit and texture propertied using N2 adsorption-desorption isotherms. CLS and ACLS are tested for removal of Cu(II), Cd(II) and Pb(II) from the wastewater solutions under various factors such as contact time, pH and adsorbent dose. Results showed that CLS as well as ACLS exhibit high removal efficiency of the studied heavy metal ions. These nominate them as low-cost adsorbent for Cu(II), Cd(II), and Pb(II) ions.