The phenol and monochlorophenols-degrading bacteria were isolated from the soil samples adjacent to textile, pharmaceuticals, industries and automobile workshops. Twenty seven isolates were recovered including twelve phenol, four 2-chlorophenol (2-CP) and eleven 4-chlorophenol (4-CP) degrading organisms. Among them five isolates were chosen as potential monochlorophenol-degrader; four of them were identified as species of Pseudomonas and one as Aeromonas. The biodegradability of phenol and monochlorophenol followed the order: phenol > 4-chlorophenol > 2-chlorophenol. Pseudomonas sp. AP2, Pseudomonas sp. AP3, Pseudomonas sp. AP4 and Aeromonas sp. PP3 degraded 400 and 600 ppm phenol within 48 and 72 h, and Pseudomonas sp. A4-CP2 degraded 600 and 800 ppm phenol in 48 and 72 h respectively. Pseudomonas sp. A4-CP2 also degraded 200 ppm 2-chlorophenol within 96 h and 200 and 350 ppm 4-chlorophenol within 48 and 75 h respectively. Bacterial isolates grew well in liquid culture containing 600 ppm phenol, while the growth was scanty in the medium containing 400 or 800 ppm phenol, except for Pseudomonas sp. A4CP2. The isolate Pseudomonas sp. A4CP2 also grew on 2-CP and 4-CP at concentrations of 200 and 350 ppm respectively. The correlation coefficient (at 0.01 level of significance) between bacterial growth and degradation capability of the isolates AP2, AP3, AP4, A4CP2 and PP3 were -0.835**, -0.847**, -0.700**, -0.946** and -0.401 respectively.Keywords: Biodegradation; Phenol; 2-Chlorophenol; 4-Chlorophenol; Pseudomonas; AeromonasDOI: http://dx.doi.org/10.3329/bjm.v25i1.4854 Bangladesh J Microbiol, Volume 25, Number 1, June 2008, pp 41-44

Treatment of industrial wastewater was conducted using Trapa natans L. and Salvinia cucullata Roxb. to determine phytoremediation ability through the evaluation of removal efficiencies of pollutants and nutrients. The experiment was designed in batch cultures for a period of 45 days and consisted of 3 sets of half-spherical earthen containers (0.5 meter diameter) with depth of 0.3 meter each and capacity of 40 liter wastewater. One set contained undiluted wastewater as control culture consisting of without macrophyte and other two sets of containers were employed for treated cultures with T. natans and S. cucullata. The removal efficiencies of biochemical oxygen demand (BOD5), chemical oxygen demand (COD), nitrate–N, ammonium–N and total phosphorus (TP) in cultures of T. natans and S. cucullata were 55.00%, 33.32%, 50.00%, 31.25% and 77.27%; and 43.02%, 31.04%, 20.00%, 5.26% and 81.25%, respectively. Phytoremediation ability of test species was assessed comparing the results of control culture with the cultures of treatment and the findings indicate significant reduction in BOD5, COD, nitrate–N and ammonium–N after growth of macrophytes for 45 days. Dissolved oxygen (DO) increased significantly in both plant cultures comparing with control culture. The pH in culture of T. natans increased from 7.21 to 8.17. BOD5, nitrate–N, ammonium–N and total nitrogen (TN) were reduced significantly in culture of T. natans comparing with culture of S. cucullata. Implication of the finding indicates that T. natans and S. cucullata can be utilized as efficient phytoremediators in treatment of industrial wastewater.Jahangirnagar University J. Biol. Sci. 6(2): 19-27, 2017 (December)

Wastewater qualities of three pharmaceutical industries were determined during July 2005 to January 2006. Alkaline earth metals including calcium (Ca) and magnesium (Mg) of wastewater ranged 41.79-54.5mgL-1 and 10.5996-32.2926 mgL-1, respectively. Alkali metals including potassium (K) and sodium (Na) of wastewater ranged 3.44-18.98 mgL-1 and 67.57- 128.71 mgL-1, respectively. Transition metal iron (Fe) ranged 1.02-2.13 mgL-1. On an average metals including zinc (Zn), lead (Pb), nickel (Ni) and cadmium (Cd) were in trace amount i.e. 84.32 μ gL-1, 11.59 μ gL-1, 4.96 μ gL-1 and 0.1047 μ gL-1, respectively in the wastewater. Copper (Cu) was undetected in wastewater. The average amount of iron of site N, magnesium of site S and potassium of site B of wastewater were higher than that of the standard of Department of Environment (DoE) of Bangladesh. Key words: Metals; Pharmaceutical wastewater; DoE standards. DOI: 10.3329/bjsir.v45i3.6538Bangladesh J. Sci. Ind. Res. 45(3), 277-282, 2010

The study was carried out to assess the impacts of textile effluents on aquatic plants by using hydroponic culture. Effluent water of three textile industries and effluent free water were collected from Savar region. The higher contents of pH (10.47), total suspended solids (1407.33 mg/L), total dissolved solids (19014 mg/L) and biochemical oxygen demand (735 mg/L) were recorded in industrial effluents comparing with control. The lowest content of DO in industrial effluents (0.87 mg/L) was much lower than the control (5.65 mg/L). Hydroponic test showed that 100, 75, 50, 25 and 1% textile effluents caused the death of Pistia stratiotes L. and Ludwigia adscendens L. within 1-4, 2- 6, 3-9, 5-12 and 14-17 days, respectively. When P. stratiotes was grown in 100% effluent water its concentrations of Cr, Cd, Cu, Mn, Ni and Zn were 8.00, 1.4375, 189.06, 1843.1, 5.075 and 261.87 ppm, respectively and the test species died within 1 - 3 days. When L. adscendens was grown in 100% effluent water, its concentrations of Cr, Cd, Cu, Mn, Ni and Zn were 7.25, 0.975, 312.87, 1621.2, 5.0125 and 138.75 ppm, respectively and the test species died within 2-4 days. The uptake of heavy metals increased with raising effluent concentration comparing with control culture. The uptake of Cr, Cd, Cu, Mn, Ni and Zn were significantly higher at 50%, 75% and 100% (p = 0.01** at 1% level of significance) effluent which caused the death of both test species. Key words: Textile effluents; Pistia stratiotes L.; Ludwigia adscendens L.; Hydroponic culture. DOI: 10.3329/bjsir.v45i1.5172 Bangladesh J. Sci. Ind. Res. 45(1), 9-16, 2010