53

presence of phenol was performed to further investigate this

phenomenon. The experimental scheme is listed in Table 4-6.


Table 4-6. Experimental scheme for PCP co-degradation in
 the presence of phenol.


 No. phenol DCP PCP Sludge N added
 mg/l mg/l mg/l ml mg/l

 601 5 1 1 2 0.46
 602 5 1 1 0 0.46
 603 5 1 0 2 0.43
 604 5 0 1 2 0.43
 605 1 1 1 2 0.15



4.3.4 Column Biodegradation Studies


 Column biodegradation were performed using the

experimental setups described in Section 4.3.2. Columns

were saturated with distilled water before a shock load of

phenolic compounds was introduced. The recirculation rate

was set at 2.7 ml/min. However, because of continuous

compressions and relaxations, the tubing inside the pump

heads became less flexible and caused the flow rate to be

inconsistent. When left unattended, the recirculation could

be and sometimes was completely stopped in five days.


 Column biodegradation I. This study proceeded from the

solute retardation determination described in Section 4.3.2.

Column #1, #2 and #3 were amended with 3 ml, 6 ml and 9 ml

municipal wastewater sludge, respectively, and also with 0.7

mg/l of ammonium nitrogen (as nitrogen). The initial

concentration for phenol, 2,4-DCP and PCP was 3 mg/l after