Abstract: Lead-acid battery utilized secondary is conform to the characteristics of green industry, effective resource utilization. Secondary utilized lead-acid battery used in mini PV system make the integration of new energy and energy storage technologies better, realize the utilization of resources. It is the practical application of the series standard of "Secondary utilized lead-acid batteries". The research results are used for sewage treatment in rural areas, can effectively integrate resources, excavate the residual capacity of batteries deeply, promote the transformation of scientific research results, realize resource recycling and protect the environment. The system has those characteristics of no power consumption, low cost, quick effect, high integration, easy operation, high flexibility, etc. It is very suitable for sewage treatment in rural areas. The effect of water treatment is stable. The indexes of COD and NH₃-N in water can be effectively controlled which has good application prospect.

Key words: secondary utilized lead-acid battery, sewage disposal, new energy