低成本的污泥燃料合成方法

通过研究污泥、煤以及干化剂的不同比例混合搅拌,测定混合后污泥的热值,结果表明:污泥、煤、干化剂的比例为:59%、36%、5%时,热值最高,混合燃料的热值可达到12762kJ/kg,满足电厂用煤热量要求,且污泥贡献的热值最高为5505kJ/kg;污泥采用高速搅拌的预处理方法后,相同配比的混合燃料其干化时间可节约1h以上。     

Drying of salted silver jewfish in a hybrid solar drying system and under open sun: Modeling and performance analyses

This study investigated the thin-layer drying kinetics of salted silver jewfish in a hybrid solar drying system and under open sun. Ten drying models were compared with experimental data of salted silver jewfish drying. A new model was introduced, which is an offset linear logarithmic (offset modified Page model). The fit quality of the models was evaluated using the coefficient of determination (R²), root mean square error (RMSE), and sum of squared absolute error (SSAE). The result showed that Midilli et al. model and new model were comparable with two or three-term exponential drying models. This study also analyzed energy and exergy during solar drying of salted silver jewfish. Energy analysis throughout the solar drying process was estimated on the basis of the first law of thermodynamics, whereas exergy analysis during solar drying was determined on the basis of the second law of thermodynamics. At an average solar radiation of 540 W/m² and a mass flow rate of 0.0778 kg/sec, the collector efficiency and drying system efficiency were about 41% and 23%, respectively. Specific energy consumption was 2.92 kWh/kg. Moreover, the exergy efficiency during solar drying process ranged from 17% to 44%, with an average value of 31%. The values of improvement potential varied between 106 and 436 W, with an average of 236 W.     

Monitoring of pathogenic microorganisms contamination during heat drying process of sewage sludge

The sewage sludge from wastewater treatment plant is a potential source of infectious organism. The number and type of pathogens in sludge depends on various factors namely, the wastewater source, the type of treatment plant, and other environmental factors such as the biological medium offered by the sewage sludge. The principal sludge-borne diseases are presented followed by discussion on biological aspect of growth and occurrence. The overall objective of this work is to estimate kinetic reduction of pathogen population in sludge during different thermal-drying process including: the agitated conductive drying, drum drying, solar drying, and fry-drying. The temperature curves were reported from literature except frying data which were determined in experiment. In order to apply the temperature influence on pathogens population, kinetic parameters for the thermal inactivation (D, z-values) were chosen from literature. Values of concentrations of each pathogen were also extracted from scientific review of pathogens in bio-solids. This study conducted to resolve the survival kinetic of Hepatitis A viruses. The result showed that a concentration of 7 × 10⁴ cfu/100 ml initially present in the sewage sludge is significantly reduced during the heat drying processes except the solar plant. The sewage sludge is completely disinfected when heated for 20 min, 10 min, and 10 s, respectively, during the agitated conductive process, vacuum fry-drying, and drum drying process.     

微波干燥制备Ag/TiO2的光催化活性试验研究

利用钛酸丁酯溶胶—凝胶法制备TiO2凝胶,通过光化学沉积法在TiO2凝胶表面负载Ag,采用微波对凝胶进行干燥制备TiO2光催化剂。以甲基橙为模拟污染物进行光催化降解试验,结果表明该方法制备的Ag/TiO2催化剂光催化活性明显提高。     

湿排粉煤灰的干燥活化与回收利用

随着电力工业的迅速发展，燃煤发电机组排出的粉煤灰量日益增加，环境污染日趋恶化。本文报导了在工业装置上采用干燥活化与回收利用的新方法，成功地解决了粉煤灰综合利用的难题，为粉煤灰的处理和利用开辟了一条新途径。     

Experimental study on agitated drying characteristics of sewage sludge under the effects of different additive agents

Drying experiments of dewatered sewage sludge（DSS） were conducted on a agitated paddle dryer, and the effects of additive agents, i.e., CaO, pulverized coal（PC）, heavy oil（HO）, and dried sludge（＂DS＂ through back mixing） on the agitated drying characteristics of DSS were investigated. The results indicated that CaO can significantly increase the drying rate of DSS.The drying rate at CaO/DSS（mass ratio） = 1/100 was 135% higher than that of CaO/DSS = 0.Pulverized coal has no obvious effect on drying rate, but the increase of PC/DSS can promote breaking up of sludge lump. Heavy oil was found to be slightly effective in improving the drying rate of DSS in the examined experimental range of HO/DSS = 0-1/20. It is also found that HO can reduce the torque of the dryer shaft, due to its lubrication effect. Back mixing of DS was found to be effective in alleviating the unfavorable effect of the lumpy phase by improving the mixing effect of the paddle dryer. There was a marked increase of drying rate with an increase of the DS/DSS in the experimental range of DS/DSS = 0-1/3.     

污染源烟尘浓度采样滤筒后续处理的改进及滤筒的质量控制

《空气和废气检测分析方法》第四版增补版所写滤筒采样后称重的规定：即烘干一小时取出称重．多次反复操作,直到恒重为止。这种操作一般需要多次重复,时间很长。通过多年的工作实践与对比实验发现：通过改变首次烘干时间,可以减少操作次数,缩短达到恒重的时间。对于滤筒的质量控制,在各个环节进行了阐述。对于以前有人提出,滤筒烘干后的冷却时间对滤筒重量有影响,经实验有不同结论。