This study investigated the impact of palm bunch ash (PBA) on the stabilization of poor lateritic soil. The palm bunch ash in percentages by weight (0%, 20%, 25% and 30%) was added to the lateritic soil. The 0% PBA acted as the control. The following parameters of the (lateritic soil+ palm bunch ash) were tested in the laboratory: Maximum Dry Density (MDD), Optimum Moisture Content (OMC), California Bearing Ratio (CBR) and unconfined compression strength (UCS). The values of the MDD, OMC, CBR and UCS increased as the PBA content in the lateritic soil was increased up to between 25% PBA, thereafter the values started to decrease. The UCS of the (lateritic soil + palm bunch ash) specimen cured for 14 days were also found to higher than that of 28 days curing period at 20% PBA content. The UCS values for 14 days became higher than that at 28 days at 25% PBA content. The PBA can be used as a lateritic soil stabilizer between (20-25%) PBA content.
The efficiency of the biological treatment of domestic wastewater produced in a hotel in Port Harcourt, Rivers State, Nigeria sitting on a clay laden soil, was evaluated in this study. The biological treatment process involved is an activated sludge system. Wastewater from the hotel's septic tank and treated water from the discharge from the activated sludge treatment plant was collected and analysis carried out in the laboratory to determine the extent of COD, BOD, TSS, NH3, Sulphate, TDS and Salinity in the wastewater as well as the treated water. The COD, BOD and TSS dropped from 45mg/l, 20.05mg/l and 35mg/l respectively to 20mg/l, 7mg/l and 10mg/l. While the NH3, Sulphate, TDS and Salinity dropped from 27.65mg/l, 450.08mg/l, 1800mg/l and 508.06 mg/l respectively to 11.55mg/l, 300mg/l, 1000mg/l and 450mg/l. The domestic wastewater treatment plant of 500m 3 /day capacity had an efficient treatment capability. All parameters, except, lead and chromium met DPR standard. However chromium met the FMENV Standard. The outlet wastewater after the treatment process also met the Federal Ministry of Environment Standard. The significance of the study is that the activated sludge wastewater treatment plant could be economically deployed in areas where there is availability of electricity and semiskilled manpower..
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