Comparison of Domestic Sewage Treatment Status in Rural Areas of Suzhou and Kenya and Discussion on Process Optimization

There is a tremendous need for elaborate, efficient and optimized domestic sewage treatment systems in rural areas all over the globe. In this study, the process, treatment efficiency, and operation management of rural wastewater sewage treatment in Suzhou are investigated and discussed. The comparison of rural domestic wastewater treatment mode between Suzhou and Kenya is analyzed. According to the investigation and analysis, it can be concluded that: for the decentralized rural domestic sewage, it is suitable to collect it separately, take the natural village as the unit to construct the sewage treatment device, and the treatment process adopts ABR anaerobic treatment + composite constructed wetland, which has the characteristics of energy-saving, convenient management and beautifying the environment; while for the rural area close to the town, it can be collected to the urban sewage treatment plant for treatment.

According to the characteristics of rural geography, climate, and domestic sewage discharge in Kenya, the paper puts forward suitable technology for Kenya, including the collection methods and treatment processes of countryside domestic sewage. The research has been proposed in the natural village of Machakos town with more than 250 natural households and more than 1000 people. According to statistical data on the village, combined artificial treatment and ecological improvement are adopted to treat sewage, improve water quality, and prevent pollution to realize the effective treatment of sewage.

Since the population density of Machakos town is low, and the domestic sewage generated from homes is discharged without treatment, it is necessary to adopt the treatment process with low power consumption and simple management. The recommended process is ABR enhanced anaerobic bioreactor + constructed wetland system ecological treatment process.