Experimental Study On Coagulation-iron-carbon Micro-electrolytic Method As The Pretreatment Of The Leachate

With the continuous improvement of the level of cities, urban garbage output in China increases rapidly, and the sanitary landfill is still China's current deal with the most important, the most convenient approach, but the sanitary landfill in the course of the operation will have a large number of rubbish Leachate.This paper is handled by the wastewater in Changchun City of Stone Ridge garbage dump leachate, pretreatment study.First of leachate in a conventional laboratory analysis of water quality,The results showed that:Leachate toxicity,From B / C than that of the general biochemical wastewater,To take an effective physical and chemical treatment technologies to remove or coagulation of the removal of heavy metals and organic compounds, so that the water quality of COD value and reduce the toxicity.As coagulation technology is simple, organic matter can be substantial coagulation down at the same time reduce theconcentrations of heavy metals have been selected.Selection of coagulation technology, as the key to coagulant, the paper selected coagulant (PFS).The results showed that:The coagulant in the leachate under optimal conditions can be removed about 35% of CODcr.Coagulation technology compared to other treatment technologies in terms of processing speed, the necessary structures in a small area, is simple, obvious effect, it is worth further study.Micro-electrolysis process is the use of scrap metal and other debris and activated carbon anode materials such as cathode material in acid batteries under the conditions of the formation of numerous small corrosion original batteries,Anode corrosion and metal consumption and electrochemical corrosion also triggered a series of related synergies,Therefore, micro-electrolysis is flocculation, adsorption, bridge, volume So, a total Shen, electrodeposition, electrochemical reduction, and other role combined effect of the results.Electrode reaction of the product has a high chemical activity,In neutral or acid side of the environment, and its cast iron electrode itself generated by the new eco-[H], Fe2 +, and so can many components and wastewater in redox reactions, many of organic matter in waste water changes in the structure and characteristics, so that Duanlian in organic matter, such as open-loop, the macromolecular material divided into small molecular materials, refractory material into easily biodegradable material.The iron-electrolysis with less investment and operating costs low, simple and effective treatment and so on. Main results are as follows:(1) through the PFS dosage, mixing methods, pH value, the settlement time and so on coagulation factors, the effect of the test, come to the Changchun City Stone Ridge garbage dump leachate (CODcr value of 4423.5 to 6650.0 mg / L) PFS best dosage for 0.375 g / L; mixing the best way for the 250 r / min 1min; in the pH value of 6, CODcr removal highest settlement best time for 120 min.(2) through the iron micro-electrolysis experiment in the technical parameters of comparison, be optimal water pH 5.0, the iron-carbon ratio of 1:1 quality, solid-liquid ratio of 1:2, aeration capacity of 60 L / h Under the conditions, not only in the degradation 240 min leachate out more than 55 percent of the CODcr, but also transforming the conventional treatment of refractory organic matter, reduce the toxic leachate.The process of aeration links and effective micro-electrolysis to avoid the traditional method in the longer run,the easy compaction problems .This process stability, packing little effect on multiple effects.