[Control of Sludge Bulking Caused by Unknown Reason Through FeCl Coupled with Biochemical Methods].

Filamentous bulking could commonly influence effluent water quality in sewage treatment plants. Existing technologies are slowly effective, time consuming, and poorly adaptable. For now, enhancing organics substrates (COD) and dissolved oxygen (DO) concentration, adding FeCl into the reactor, and maintaining alternant aeration conditions are common methods to control filamentous bulking, but the effects of coupling techniques on the control of bulking are rarely reported.

[Kinetics and mechanism analysis of the degradation of hexachlorbenzene in water by advanced oxidation process].

The degradation characteristics and rule of hexachlorobenzen (HCB) in water were studied and the results were compared by the advanced oxidation process UV, O3 and UV/O3. The experimental results showed that UV itself did not contribute to the removal of HCB obviously and HCB could be quickly degraded by O3 and UV/O3, namely UV < O3 < UV/O3. But in the case of O3 and UV/O3, raising the initial pH value of the system could not raise the removal rate of HCB, and the removal efficiency of 0.