Abstract
The objective of this study is to analyze the possibilities of increasing energy efficiency in the central region wastewater treatment plant by focusing on two aspects: biogas production and prediction of energy production. The analysis is based on one of the biggest central region wastewater treatment plants in Malaysia. After studying the energy efficiency, which consists of optimization of energy consumption and enhancing gas generation, the prediction of power consumption is performed using an autoregressive integrated moving average (ARIMA) model. The prediction results are compared with the linear regression method. Comparison shows that even though the total cost of savings is greater by using linear regression, the prediction through ARIMA is more accurate and has smaller root mean square error. The implementation of these two aspects managed to increase energy efficiency by 10% of energy recovery that could further reduce electricity cost and reduction of sludge cake disposal off site. The study recommends other aspects, such as modification in setting up the frequency of variable speed drive for aerators and blowers and optimizing number of feeds into train unit processes within aeration tanks in increasing energy efficiency.
Highlights
The United Nations stated that the current world population is expected to increase to 11.2 billion by the year 2100
Enhanced precipitation is employed in enhancing preliminary treatment (EPT) aimed to increase the amount of primary solid from primary clarifier tank (PCT) and sending it to anaerobic digesters to increase biogas production, to reduce oxygen demand and biomass produced in the secondary biological process
From SPSS, the best autoregressive integrated moving average (ARIMA) model that should be used based on our data is ARIMA (0,1,0). This model allows prediction for energy consumption to be obtained and these results can be used as guidelines for energy efficiency
Summary
The United Nations stated that the current world population is expected to increase to 11.2 billion by the year 2100. A general example is the Strass wastewater treatment plant in Austria, which has reached 108% of energy recovery through increasing energy efficiency (Wett ). Improvement of energy efficiency is based on two aspects: first, to increase energy generation via increasing biogas production and electricity recovery by application of new combined heat and power generation systems; and second, to analyze the cost of operating a wastewater plant and predicting the energy usage. In order to reach up to 10% energy efficiencies in the regional wastewater treatment plant, electricity generation within the range of 0.25 kWh/m3 to 0.40 kWh/m3 has to be achieved. In order to reach a higher percentage of energy efficiency in the regional wastewater treatment plant, proposed optimization measures alone are insufficient. Energy efficiency is defined as the ratio of electricity generated to the electricity needed to operate the wastewater treatment plant (Shi ).
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