| Alkyd resin is an important part of chemical raw materials and chemical products manufacturing,Alkyd resin production wastewater contains a large amounts of organic matters,such as xylene,ethyl benzene,and acetophenone.Those organic matters in waste-water will significantly inhibit the water treatment of microbial activity.Therefore,resin production wastewater is the typical example of organic wastewater containing toxic compounds,and the treatment of alkyd resin production wastewater is of great difficulty,which was recognized by the resin industry.Current treatment method for alkyd resin production wastewater is incineration,but this method consumes a lot of energy and cannot recycled resourced.Therefore,it is particularly urgent to find a biological treatment method to efficiently degrade the resin production wastewater.In this study,Spiral Symmetry Steam Anaerobic Bioreactor（SSSAB）was used as the carrier to study the effect of physical and chemical pretreatment on the treatment of alkyd resin production wastewater by SSSAB,and to investigate whether the traditional pretreatment can be omitted by using SSSAB.By comparing the anaerobic degradation of organic compounds in simulated wastewater,the types of organic compounds in wastewater and their potential degradation pathways in SSSAB were determined.Moreover,other electron donors were added to assist in the degradation of organic wastewater of a single component.The research results are as follows:（1）Operation characteristics of SSSAB treating the alkyd resin production wastewater: Under the condition of influent COD of 9 133 mg/L,hydraulic retention time（HRT）of 1.25 d and organic loading rate（OLR）of 7.2 kg/（m3·d）,the COD removal efficiency reached 89.36% for unpretreated wastewater.However,the COD removal efficiency reached 94.62% for pretreated wastewater under the condition of influent COD of 6 399 mg/L,HRT of 0.83 d and OLR of 7.56 kg/（m3·d）.（2）Study on organic components and degradation pathways of alkyd resin wastewater: The components of the filtered alkyd resin production wastewater were tested by GC-MS.Results showed that organics in alkyd resin production wastewater was mainly divided into p-xylene and o-xylene,and the ratio of peak area to total peak area was 46.57% and 30.42%,respectively.After physicochemical pretreatment,the organics were mainly divided into acetophenone and phenol,with peak area ratios of80.49% and 12.38%,respectively.While after anaerobic degradation,none of the four organic components were detected,which indicates that SSSAB has a good effect on organic degradation.GC-MS analysis of the anaerobic effluent of simulated wastewater,show that four new organic compounds were produced by anaerobic degradation of xylene,and five new organic compounds were produced after anaerobic degradation of acetophenone and phenol,and the actual alkyd resin production wastewater,comparing the anaerobic degradation of organic compounds in two water samples after anaerobic degradation of organic matter type and quantity of the difference,The co-metabolism of some organic compounds in the anaerobic degradation process was confirmed,and the possible degradation pathway was judged: for example,xylene would be partially degraded into cyttol in the anaerobic degradation process,and could not be further degraded due to the lack of further degradation enzymes and microorganisms.（3）Study on anaerobic biodegradation of wastewater from alkyd resin production enhanced by electron donor: Comparing the serum bottle of gas rate and gas production,it found that it was difficult to separate xylene to simulate water anaerobic degradation or slow degradation rate;The anaerobic degradation of xylene can be enhanced by adding electron donor,as the content of organic matter in waste water up to 150 mg/L,found that the efficiency of the anaerobic degradation of gradually reduce,However,the reduction effect was not significant,indicating that 150 mg/L xylene did not have an obvious inhibition effect on anaerobic biodegradation. |
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