Impact of activated sludge process configuration on removal of micropollutants and estrogenicity.

The efficacy of three different wastewater treatment configurations, conventional activated sludge (CAS), nitrifying activated sludge (NAS) and biological nutrient removal (BNR) for removal of selected micropollutants from authentic wastewater was investigated. The processes were also characterized based on their proficiency to reduce the estrogenic activity of the influent wastewater using the in vitro recombinant yeast assay. The removal efficiency of trimethoprim improved with the complexity of the three treatment process configurations. Ibuprofen, androstendione, sulfamethoxazole, nonyl-phenol, estrone and bisphenol-A had moderate to high removals (>65%) while carbamazepine and meprobamate remained recalcitrant in the three treatment process configurations. The removal of gemfibrozil was better in the NAS than in BNR and CAS treatment configurations. The yeast estrogen screen (YES) assay analyses showed an improvement in estrogenicity removal in the BNR and NAS treatment configurations as compared to the CAS treatment configuration. Comparing the estrogenic responses from the three treatment configurations, the removal efficiencies followed the order of BNR=NAS>CAS and all were greater than 81%.

Assessment of the removal of estrogenicity in biological nutrient removal wastewater treatment processes.

The removal of estrogenicity in a University of Cape Town-biological nutrient removal (UCT-BNR) wastewater treatment process was investigated using pilot and bench scale systems, batch experiments and mathematical modeling. In the pilot BNR process, 96 ± 5% of the estrogenicity exerted by the influent wastewater was removed by the treatment process. The degradation efficiencies in the anaerobic, anoxic and aerobic zones of the pilot BNR bioreactor were 11 ± 9%, 18 ± 2% and 93 ± 10%, respectively. In order to further understand the performance of the BNR process in the removal of estrogenicity from wastewater, a bench scale BNR process was operated with synthetic wastewater dosed with E1 and E2. The removal of estrogenicity in the bench scale system (95 ± 5%) was comparable to the pilot BNR process and the degradation efficiencies were estimated to be 8 ± 0.8%, 38 ± 4% and 85 ± 22% in the anaerobic, anoxic and aerobic zones, respectively. A biotransformation model developed to predict the fate of E1 and E2 in batch tests using the sludge from the BNR process was calibrated using the data from the experiments. The biotransformation rate constants for the transformation of E2 to E1 were estimated as 71 ± 1.5, 31 ± 3.3 and 1 ± 0.9 Lg COD(-1)d(-1) for the aerobic, anoxic and anaerobic batch tests, respectively, while the corresponding biotransformation rate constants for the transformation of E1 were estimated to be 7.3 ± 1.0, 3 ± 2.0, and 0.85 ± 0.6 L·g COD(-1)d(-1). A steady state mass balance model formulated to describe the interactions between E2 and E1 in BNR activated sludge reasonably described the fate of E1 and E2 in the BNR process.

UMBILICAL CORD PARAMETERS IN ILORIN: CORRELATES AND FOETAL OUTCOME.

BACKGROUND: The anthropometric parameters of the umbilical cord have clinical significance. Current parameters of the cord, its correlates and related foetal outcome are lacking in our parturients. OBJECTIVES: To describe the anthropometric parameters and abnormalities of the umbilical cord; and determine their maternal correlates and foetal outcome. DESIGN: A cross sectional analytical study. SETTING: The Obstetric and Gynaecology Department of the Universityof Ilorin Teaching Hospital, between September 2012 and June 2013. SUBJECTS: Healthy pregnant women with singleton pregnancies. RESULTS: Four hundred and twenty-eight (428) singleton deliveries were studied. The respective mean values of the cord length and width were 526.87 ± 115.5mm and 19.56 ± 11.12mm.Short cord (< 40cm) occurred in 7.2% while long cord (> 69cm) was found in 9.3% of the parturient. The incidences of single umbilical artery, cord round the body and knots were 7%, 8.4% and 14.5% respectively. Nuchal cord was the most common (91.4%). Only gestational age had significant statistical relationship with cord length abnormalities (P = 0.0093). The cord length was an important correlate of cord helices, knots and vessels (P < 0.05).Parity had correlations with the number of vessels (R = 0.099, P = 0.042). The cord coiling index was statistically related to the presence of congenital abnormalities (P = 0.011). Other perinatal events were not related to umbilical cord parameters. Perinatal asphyxia was the most common indication for NICU admission (3.5%) but there was no significant statistical difference between NICU admission and cord parameters. CONCLUSION: The umbilical cord parameters in apparently healthy parturients in Ilorin were comparable with others elsewhere. The cord length and helix are important correlates of gestational age and congenital abnormalities. Parity may be related to abnormal umbilical vessels. Cord length, coils, coil index and umbilical vessels should be examined post-natally.

Umbilical cord parameters in Ilorin: correlates and foetal outcome

Background: The anthropometric parameters of the umbilical cord have clinical significance. Current parameters of the cord, its correlates and related foetal outcome are lacking in our parturients. Objectives: To describe the anthropometric parameters and abnormalities of the umbilical cord; and determine their maternal correlates and foetal outcome. Design: A cross sectional analytical study. Setting: The Obstetric and Gynaecology Department of the University of Ilorin Teaching Hospital, between September 2012 and June 2013. Subjects: Healthy pregnant women with singleton pregnancies. Results: Four hundred and twenty- eight (428) singleton deliveries were studied. The respective mean values of the cord length and width were 526.87±115.5mm and 19.56±11.12mm. Short cord (< 40cm) occurred in 7.2% while long cord (> 69cm) was found in 9.3% of the parturient. The incidences of single umbilical artery, cord round the body and knots were 7%, 8.4% and 14.5% respectively. Nuchal cord was the most common (91.4%). Only gestational age had significant statistical relationship with cord length abnormalities (P = 0.0093). The cord length was an important correlate of cord helices, knots and vessels (P< 0.05).Parity had correlations with the number of vessels(R= 0.099, P=0.042). The cord coiling index was statistically related to the presence of congenital abnormalities (P=0.011). Other perinatal events were not related to umbilical cord parameters. Perinatal asphyxia was the most common indication for NICU admission (3.5%) but there was no significant statistical difference between NICU admission and cord parameters. Conclusion: The umbilical cord parameters in apparently healthy parturients in Ilorin were comparable with others elsewhere. The cord length and helix are important correlates of gestational age and congenital abnormalities. Parity may be related to abnormal umbilical vessels. Cord length, coils, coil index and umbilical vessels should be examined post-natally