Although anaerobic treatment is widely used for swine wastewater
in many countries, several problems exist regarding its practical
∗ Corresponding author. Tel.: +86 13805739113; fax: +86 571 88388393.
E-mail address: wudl@zju.edu.cn (D. Wu).
operation. These problems include high COD concentrations in the
effluent, low phosphorus removal efficiency and methane production
[4