The Treatment Of Furfural Wastewater By Combination Processes Of Iron-carbon Micro-electrolysis And UASB

Because of the simple of process, a wide range of uses, the characteristics of our country's economic development and the perspective of using waste of resources, furfural production is in rapid development in our country. There are more than forty kinds of organic in the furfural wastewater, such as acetum, furfural, alcoholic aldehyde, ketone, ester and so on, in which the major organic is acetum and furfural. The characteristics of furfural wastewater summarized in the paper are high concentration organic, high acidity and debiodegradation. Discharged straightly without being treated, the wastewater can pollute environment heavily and be harmful to human's health finally. Nowadays biodegradation is the most economical and effectual way in kinds of treatments of furfural wastewater. But it has some disadvantages, for example, it has to adjust pH, and some organic isn't biodegraded. So it is necessary to study a practical and effectual pretreatment of furfural wastewater.The purpose of this research that was focused on the furfural wastewater was to improve the disposal efficiency, save resource and fund. In this paper, the principle, effect factors, development and application of the iron-carbon micro-electrolysis and UASB process were introduced. Then a new pretreatment of furfural wastewater was brought forward. Experimental study of the various process parameters on micro-electrolysis effect of pretreatment, and try to carry out on the anaerobic sludge particles of culture, we have had good results.The process of micro-electrolysis is that using lots of micro-batteries to erode the anode and lead to a series of reactions, and the micro-batteries appear in acidity by making use of the mixture of the anode material and cathode material. So the process of micro-electrolysis is a result by some actions including flocculation, adsorption, deposition, etc. The iron and [H], Fe2+ produced in the reaction is lively, that could change the structures and characteristics of the organic in wastewater, leading to degrade easily. The process of micro-electrolysis has many advantages, such as less investment, low running cost, simple process operation, and high efficiency, etc.UASB is a treatment approach to converse and stable the organic compounds in anaerobic condition. In the anaerobic wastewater treatment process, a large number of organic matter in wastewater, was eventually converted into methane, carbon dioxide, water, ammonia and hydrogen sulfide in the common microbes. In this process, different microbial metabolic process is interaction, restraint, and complex ecosystem. Using up-flow anaerobic sludge blanket of a major wastewater treatment, the main consideration to the research of regional wastewater biodegradability of furfural good pretreatment of wastewater BOD5/COD could reach 0.65, and the process is also an UASB efficient anaerobic treatment process, the sludge load, small footprint, generated during the operation of methane is a kind of available resources, the wastewater treatment in a variety of fields have been well used, particularly wastewater treatment furfural areas, the removal rate could reach more than 90%.The conclusions of the researches:(1)When furfural wastewater passed through, there would be take place a series of reaction of electro-chemical and physical-chemistry in the micro-electrolysis bed which consisted of iron filings and active carbon. These responses reduce the pH value, and part of pollutants has been effectively removed, thus easing the UASB reactor deal with the load. When the wastewater from micro-electrolysis pretreatment flows through the UASB reactor, the anaerobic reactor (especially methane-producing bacteria) consumed most of the organic pollutants, and eventually produced a granular sludge.(2)It was practicable to treat furfural wastewater by the iron-carbon micro-electrolysis, UASB and coagulation process. The removal rate of CODCr was above 80%.(3)The effect of the cathode padding, the granularity of iron filings and active carbon, hydraulic retention time of micro-electrolysis process were studied in this paper. On the other hand, we observe the trial through the UASB process, wastewater pH, VFA, CODCr gas production, as well as the best of a change in the treatment of influencing factors. The most appropriate process parameters was Iron size of 1-2 mm, activated carbon particle size was <1 mm, the iron-carbon ratio was 0.67, micro-electrolysis reaction time was 60 min. Stabilization phase UASB hydraulic retention time of 48 h, the removal rate was 80.5 percent. Eventually we generated a large number of granular sludge.If the reactor effluent has been treated through the bio-contact oxidation process, they can be reached stable discharge standard. This process runs simple to make full use of the characteristics of wastewater. This process also increased the degree of wastewater resources.