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The present study was conducted on solid waste management of Jimma City municipality to find out the client satisfaction of solid waste management services and to find out the factors associated with client satisfaction of solid waste management services. The study was performed with 260 respondents of Jimma City residents. Data were collected using a structured questionnaire. Majority of the respondents 166 (63.85%) in the study areas were used municipal solid waste management service rendered by Jimma city municipality. Out of these 124(74.7%) of clients were unsatisfied with the service. The study revealed that client satisfaction to municipal solid waste management service is statistically associated with waste collection frequency (X2=19.8630, df=6, P<0.05). The findings also showed that age, educational status, and family size had significant (p<0.05) positive correlation with the satisfaction of solid waste management services. From this study it is recommended that solid waste collection time should be properly maintained and City municipality showed increase manpower, labor cost, and transport. NGOs or other organization (government and private) should involve in solid waste management service in Jimma city.

Phosphorous from municipal and industrial wastewater is the main cause of eutrophication of rivers and lakes, because effluent quality from conventional secondary wastewater treatment plants does not meet the discharge standard that demands further treatment. Therefore, we investigated pumice as a potential low-cost adsorbent for the tertiary treatment of phosphate from municipal wastewater. The phosphate adsorption process reached equilibrium after 60 minutes contact time and achieved a removal efficiency of 94.4% ± 0.7% for an adsorbent dose of 10 g/L in 3 mg/L phosphate solution. The highest phosphate removal was recorded at pH 7. The experimental data best fitted with the Redlich-Peterson isotherm and the pseudo-second-order kinetic models. The coexisting anions decreased phosphate adsorption in the order of mixture >SO42– > HCO3− > NO3− > Cl− > CO3−. Pumice removed 95% ± 0.2% of phosphate from effluents of the secondary treatment unit of a municipal wastewater treatment plant. Furthermore, effective regeneration of saturated pumice was possible with a 0.2 M NaOH solution. Therefore, pumice could be a technically workable low-cost reusable adsorbent for phosphate removal from wastewater as a tertiary treatment to curb eutrophication of surface waters. However, further column adsorption study is recommended for a continuous flow system to optimize process design variables and scale up for field applications.

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