| A certain medicine plant is a typical chemistry pharmacy factory, its main products contain Keto glycoside, geranyl ester, astaxanthin.Iron-carbon micro-electrolysis process was presented according to organic wastewater produced in a pharmaceutical material plant. Considering the quality of high-strength wastewater, the mixed wastewater was made up of 30% high-strength wastewater pretreatment by Fe-C micro-electrolysis and 70% low-strength wastewater, and then it was treated by following biological method and advanced treatment.The results of this research are as follows:(1) The results showed that the optimal technological parameters were:pH value, mass ratio of solid to liquid,oscillating reaction time and mass ratio of Fe to C, being equal to 3,0.08,120 min and 3:1 respectively, the B/C was significantly increased, the biodegradability was greatly improved.(2) When the high-strength wastewater treated by iron-carbon micro-electrolysis, we could see the B/C value has increased from 0.10 up to 0.30, the wastewater was still not suitable for further biological treatment for there may contain some Substance not be removed by [H],[O], Fe2+ Fe3+, effluent pH was adjusted to neutral.The ferrous ion was conducive to the subsequent biological treatment.(3) The process has good prospects for its low-cost,also,which can provide a theoretical basis and reference for high concentration chemical wastewater treatment. Meanwhile, the use of scrap iron and actived carbon as raw material has a "by Waste" significance.(4) Organic matter was degradated by suspended and attached micro-organisms. The hydraulic retention time of A/O/MBBR/O process was 138h, dissolved oxygen was 2-5mg/L,under the conditions, the average removal rate of CODcr of this system was 81% in continuous 2 months.MBBR can greatly improve the biochemical pool volume load, reduced hydraulic retention time, reduce pool capacity.(5) The ferric chloride was selected as a coagulant, the optimal technological parameters were:pH= 4, coagulant dosage was 400mg/L.(6) Fenton can remove most of refractory organic pollutants in wastewater. The results showed that the optimal technological parameters were:pH, H2O2 dosage, FeSO4·7H2O dosage, reaction time being equal to 3,2000mg/L,750mg/L and 2h respectively,CODcr removal rate reached 25%.The results showed the effluent treated by iron-carbon micro-electrolysis and A/O/MBBR/O was stable. The biodegradability of high-strength wastewater pretreatment by Fe-C micro-electrolysis increased, but it did not reach the ideal biochemical condition. MBBR can be used in the existing treatment plant biochemical system reforming.lt can increase unit capacity and effectiveness without changing volume of the existing biological treatment tank, to ensure water quality.
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