Study On Treatment Of Actual Dyeing Wastewater By Compound Process Of Micro-electrolysis-biochemical Technology

Dyeing wastewater has a large amount of complex components with high concentrations of organics and COD, high-color and poor biodegradability characteristics. The wastewater is key sources of pollution in current water system environment and one of difficulties and focus in industrial wastewater treatment. Nowadays, traditional biochemical methods or other individual wastewater treatment technology were used to deal with such wastewater, but it is difficult to achieve a good treatment effect. Especially new complex dye are widely used and use of the current discharge standard of state and local government.Given the technology difficulties of wastewater treatment in dyeing wastewater in our country, a novel micro-electrolysis composite material was prepared, which was wide high efficiency, low cost, simple operation. A brand-new treatment technology based on microelectrolysis technology and integrated biology was put forward in this thesis, in which study on treatment of actual dyeing wastewater by combination process of microelectrolysis-UASB-SBR.The Main research contents and conclusions are as follows:(1) The preparation of iron carbon micro-electrolysis materials and research on actual wastewater by continuous treatment processThe preparation conditions of iron carbon micro electrolysis material as follows: When the Ti O2 content was 6%, iron/carbon ratio 1:1, sintering temperature 800?, caking agent content 2%, the removal rates of NH4+-N, COD and chroma of the dyeing wastewater by homemade micro-electrolysis materials was 89.7%, 78.0%, and 90.0% respectively. During 22 days of continuous operation of the micro-electrolysis treatment system, the removal rates of NH4+-N, COD were above 80%, 70% respectively, and the removal rates of chroma was 90%. Dyeing wastewater has good chroma removal effect by micro-electrolysis treatment system(chroma dropped to 30 times).(2) Study on the treatment of actual dyeing wastewater by compound process of iron carbon micro-electrolysis-UASB with loading PVA micro-gel beadsWhen HRT was 6 h, raw wastewater p H 3.5, and flocculation p H 8.0, the effect of micro-electrolysis pretreatment process was best(COD removal rate was 75%). After the normal operation of the reactor, micro-electrolysis effluent COD was dropped to 200-400 mg/L by compound process. PVA gel beads surface and internal micro porous enrichment of microorganism is the main cause of the high removal rate of whole process.(3) Study on the treatment of actual dyeing wastewater by compound process of iron carbon micro-electrolysis-UASB-SBRWhen the influent COD is 1000-1800 mg/L, NH4+-N 5-15,chroma 100-150 times, firstly effluent COD reduced to 200-600 mg/L and effluent chroma and NH4+-N decreased 20 times, below 3 mg/L respectively by micro-electrolysis treatment system, then effluent COD stable at between 200-500 mg/L by a UASB with loading PVA micro-gel beads. Dyeing BOD5/COD(0.2-0.16) increased to BOD5/COD(0.2-0.6) by micro-electrolysis treatment system. In other words, wastewater biodegradability was significantly improved. Effluent phosphorus removal rate is above 80% by micro-electrolysis treatment system. Effluent COD stable at below 200 mg/L(COD removal rate 85%) by micro-electrolysis and UASB-SBR with loading PVA micro-gel beads. By scanning electron microscopy observe PVA gel particles microbial changes in UASB reactor. It was found that with the extension of the running time of PVA gel particles inside microorganisms growing and species populations gradually increased.(4) Study on treatment of actual dyeing wastewater by continuous aluminum carbon micro-electrolysis processWhen treatment p H value was 12, treatment time 9 h, the removal rates of COD, NH4+-N and chroma of the wastewater by aluminum carbon micro-electrolysis(ACM aluminum/carbon ratio 1:1, sintering time 1.5 h) was 55.6%, 71.1%, and 68.0% respectively. During 15 days of aluminum carbon micro-electrolysis treatment process(treatment time 9 h), the removal rates of COD, NH4+-N and chroma were above 50%, 60%, and 70% respectively. Without adjusting influent p H value, comprehensive treatment effect by CACMP is achieved during stable operation, effluent NH4+-N concentration reduced below 5 mg/L.