*7.2. Substrate Concentration*

The impact of substrate concentration on electricity output was explored by the dual chamber MFC (DCMFC) to treat domestic wastewater [145]. The performance of DCMFC in the removal of COD was analyzed at various organic loading levels varying from 435 to 870 mg COD/L·d. It can be said that the COD removal efficiency is greater than 90% as the organic loading rate rises from 435 to 720 mg COD/L·d. In contrast, the COD removal efficiency declined to about 70% at a lower loading rate (870 mg COD/L·d).

Various performance evaluation studies about pH and substrate concentration have been illustrated in Table 4.


**Table 4.** Effect of pH and substrate concentration on MFC performance.
