Treatment On Acrylic Wastewater In Jilin Chemical Fiber Factory By Zero-Valent Iron

As the amout of effluent ammonia has reached the emission standards, decreasing the amout of COD in the effluents has becomed the common goal in treating acrylic fiber wastewater process.However, because of its high refractory organic matters and poor biodegradability, that makes it difficult to achieve the desired results only by biological treatment.Zero-valent iron pretreatment has been proved to be an effective technology with low cost and biodegradability improving.As the results, the research including treatment on characteristics pollutants and the actual polymerization unit wastewater by zero-valent iron was studied.The results showed that when the iron carbon ratio is 1:1,the hydraulic retention time of 60min, zero-valent iron micro-electrolysis on DMAC has little effect compared with the adsorption. The adsorption capacity of activated carbon has been calculated to be 7.52gDMAC/250g.Iron-copper electrosis has been used for removing the acrylonitrile.The results has shown that in the 3 hours of treatment time it has achieved a complete removal of acrylonitrile.On this basis, iron-copper inner electrolysis process was used in the treatment of the Acrylic polymer wastewater, and the facts which have effects on COD removal efficiency were studied. The optimized conditions were achieved as follows:3 of pH,600 r/min of stirring speed,300g of Fe amount, lOg of the CuSO4 amount,90min of response time. Under such conditions, the removal ratio of COD reaches 70% and the B/C values increases from 0.2 to 0.57.The major pollutants of acrylonitrile has been completely removed. The electrolysis plays a major role in TOC removal mechanism.A continuous flow reactor with iron and copper has been runned for a month. Although partial oxidation of iron can be seen from the appearance, the COD removal rate of iron is still in an relatively stable state instead of decreasing.