Abstract:

A survey of the situation of the rural sewage treatment plants( RSTP) in 67 counties of Zhejiang Province was conducted by means of questionnaire,and then statistical analysis was performed for status quo of the facilities,covering power,treatment technology,standard to observe,operation mode and source of funds,etc.. Besides,exploration and analysis was done of standards for discharge of treated sewage from the plants and long-term nature of the operation,maintenance and management of RSTP. Results show that currently,the RSTP in Zhejiang Province are dominantly medium and small in scale( 30- 60 t·d^-1),and about 80% of the RSTP adopt the technology of unpowered anaerobic artificial wetland and observe Grade B criteria of the standard for sewage discharge( GB 18918-2002); the plants are generally run and maintained by their respective home villages or townships at an average cost of nearly RMB 13 000 Yuan·a-1. It is,therefore,suggested that Zhejiang Province formulate province-specific standards for discharge of treated waste water from RSTP as soon as possible with a proper number of indexes,which may be a little bit looser than Grade A criteria of the standard GB 18918-2002 and mechanisms of long-term nature for defining responsible parties,funding and managing third-party-run RSTP in Zhejiang Province as soon as possible,too.

Key words: rural sewage, discharge standard, operation and maintenance, treatment process, strategy