According to computational fluid dynamics, heat transfer theory, and chemical reaction kinetics theory, the models of single-pellet biomass combustion were established, flow, heat transfer and mass transfer of single-particle biomass fuel during combustion were analog calculated, and they showed about 2 min, a 2 cm biomass pellet fuel completely burnt out , the highest temperature is 1280 k, the release of gases such as H2O, CO2 and CO. The bed combustion model of biomass chain furnace was built based on the single particle fuel combustion model means the bed combustion process of biomass particles is in good agreement with the actual combustion process. This study provides a theoretical basis for the whole biomass briquette boiler system design and performance optimization and improvement.

Chem-bioflocculation (CBF) process was a new municipal wastewater treatment process developed in recent years. The flocculant dosage was one of the most important factors in operation optimization of chem-bioflocculation(CBF) treatment process. Five levels of flocculant dosage (PAFC) from 30mg/L to 100mg/L were applied to compare operational performance between CBF process and chemically enhanced primary treatment (CEPT) process. Superior column loadings of COD, SCOD, SS, and NH4+-N were obtained in CBF process. The column loading of TP was present as close level in two processes. The biodiversities of microbial communities, including Bacteria, Acitnomycetes, Acidobacterium, and ammonia oxidizing bacteria (AOB), were analyzed by using PCR-DGGE method with group-specific primers at different flocculant dosage of polyaluminium ferric chloride (PAFC). The results indicated that CBF reactor contained special bacterial community structure other than CEPT reactor. The special distribution of bacterial population was even at different positions of two reactors. To quantify Bacteria cells, Real-Time PCR method was applied by using primers for 16SrDNA V3 regions. CBF reactor had a little less population size of Bacteria than traditional AS process, but great higher than that of CEPT reactor.

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