SUNPan,HUANGFu-zhen,YUYang,et al.Optimization for Organic Release of Natural Solid Carbon Source Brown Rice and Its Application for Denitrification[J].China Water & Wastewater,2024,40(1):15-21.
Optimization for Organic Release of Natural Solid Carbon Source Brown Rice and Its Application for Denitrification
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第1期
Page:
15-21
Column:
Date of publication:
2024-01-01
- Keywords:
- solid carbon source; brown rice; response surface methodology; organic release performance; carbon release condition; denitrification
- Abstract:
- In this study, brown rice was selected as the typical natural solid carbon source due to the merits of wide-available and economical-viable. The carbon release parameters of brown rice, including temperature, pH, and hydraulic conditions (HC), were optimized by using Box-Behnken Design model of response surface methodology. The results showed that the effects of individual and combined factors were followed as the order of HC>temperature>pH, and temperature-HC>pH-HC>temperature-pH. The optimal parameters for carbon release from brown rice were 35 ℃, pH=7, and 61 r/min, and then the organic release capacity (in terms of COD release rate per unit SCS) could reach 19.9 mg/(gd). The validation tests showed that the model was accurate and reliable. Furthermore, the economic analysis showed that the cost for organics supply could be as low as 2.3 yuan/kg, which was prior to some conventional carbon sources, e.g., acetate and glucose. The brown rice was used as the carbon source for denitrification, and the total nitrogen removal efficiency and rate were (77.6±7.4)% and 24.1 mg/(Ld), showing bright application prospects. This study can offer technical support and operational parameters for the practical application of brown rice as solid carbon source in wastewater treatment.
Last Update:
2024-01-01