Preparation of composite slow-release carbon source from industrial park vinasse solid waste and its performance evaluation
The ratio of carbon to nitrogen(C/N)in influent of wastewater treatment plants of industrial parks in China is generally too low to denitrification,and supplementary carbon sources are often required to improve the nitrogen removal performance.Vinasse solid waste is rich in organic components such as proteins and carbohydrates,which have a good biodegradability.However,there is still a lack of research on its use as a slow-release carbon source.In this study,vinasse solid waste from an industrial park was used as raw material,and polyvinyl alcohol(PVA)and sodium alginate(SA)were used as hybrid scaffold to prepare a slow-release carbon source by the low-temperature freeze chemical cross-linking method.The carbon release and denitrification performance of the material were evaluated.Results showed that the optimization of hybrid scaffold ratio and emulsifier dosage could extend the rapid release period of the slow-release carbon source to 3 d.At this stage,the process of carbon release was governed by the framework dissolution mechanism.The cumulative carbon release of the slow-release carbon source(measured by chemical oxygen demand,COD)was 1 089 mg·(g·L)-1.The optimal slow-release carbon source was prepared under the conditions of 10 g·L-1 vinasse solid waste,PVA∶SA ratio of 8∶1,and 1.0％span80 as emulsifier.During the denitrification process,at slow-release carbon source dosage of 0.19 g·L-1 and(41.53±0.1)mg·L-1 of initial nitrate nitrogen(NO3--N),the dissolved organic matter(DOM)of the effluent presented the highest humification degree,the lowest molecular weight,and the least aromatic ring substituent types and degree.The total nitrogen removal rate was 99.2％,and the denitrification rate reached 4.08 mg·(L·h)-1.This study could provide a reference for the collaborative management of wastewater and solid waste in industrial parks.
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