Application Of The Micro-electrolysis Ceramics On Treatment Of Synthetic Dye Wastewater

Clay, iron powder and powder activated carbon were used as main materials for sintering a kind of novel micro-electrolysis ceramics. The water absorption, voidage, bulk density and grain density of the ceramics were measured, and SEM was used for observing the microstructure of surface and cross section. Besides, the feasibility of the ceramics used as micro-electrolysis fillers was also analyzed. Then the ceramics were applied in the treatment of three kinds of synthetic dye wastewater. Firstly, the effect of influent dye concentration, influent pH, HRT and aeration on effluent quality was investigated respectively; and then the UV-vis spectrum was scanned for analyzing the decoloration of the dye wastewater. At last, continuous running experiments were conducted to test the performance of the ceramics against hardening and passivation. The whole research results were as follows:The physical properties of the micro-electrolysis ceramics which were sintered with a certain mass ratio of the raw materials (clay:Fe powder:powder activated carbon=8:4:1) owns a water adsorption of14.8%, bulk density of992.05kg/m3, grain density of3006kg/m3and voidage of67%. SEM analysis showed that the surface of the ceramics was very rough and the interior morphology was loose porous. Soaking experiment demonstrated that the ceramics own suitable soak strength and good ability against agglomeration. With the progress of the micro-electrolysis reaction, the surface of the ceramics was renewed, which ensured the stability of the reaction.The micro-electrolysis ceramics were applied in the dye synthetic wastewater treatment. The optimal conditions were as follows:(1) Acid Brilliant Scarlet GR:Co (influent dye concentration)=600mg/L, pH=4, A/L=1.5, HRT=2h; under which the removal rate of chroma and CODcr were96%and49%, respectively;(2)MethyleneBlue:Co=1000mg/L, pH=5, A/L=1.5, HRT=4h; under which the removal effuciency of chroma and CODcr were90%and58%, respectively;(3) Reactive Blue X-BR:C0=600mg/L, pH=5, A/L=1.5, HRT=6h; under which the removal rate of chroma and CODcrwere83%and12%, respectively. The UV-vis spectrum analysis showed that the azo bond of Acid Brilliant Scarlet GR molecule, the conjugate chromophore of MethyleneBlue molecule and the anthraquinone bond of Reactive Blue X-BR molecule was broken through micro-electrolysis reaction.The continuous running experiments demonstrated that the micro-electrolysis reactor improved with the ceramics could run for a comparatively long time and could avoid failure of the reactor. Water backwashing could help recover reaction capacity of the reactor.