改性大豆蛋白胶黏剂的酸化效应

以浓硫酸为酸化剂,探讨改性大豆蛋白胶黏剂的酸化处理效应。结果表明：随pH值的降低,改性大豆蛋白胶黏剂的颜色逐渐变浅,黏度先逐渐上升再急速下降,胶合强度则先下降后上升。采用酸化处理可明显改善改性大豆蛋白胶黏剂的颜色和流变性能,且不影响其胶合性能。     

Defined multi-species semi-liquid ready-to-use sourdough starter

This paper aimed at setting up a protocol for the manufacture of a defined multi-species semi-liquid ready-to-use sourdough starter consisting of lactic acid bacteria (LAB) selected on the basis of their capacity of rapid acidification and adaptation to several technological factors. Preliminarily, 56 strains of sourdough LAB were screened based on the acidification kinetics during sourdough fermentation. The influence of temperature (25-37 degrees C), NaCl (2%, w/w, of wheat flour), initial cell number (10(7)-10(9) cfu g(-1)), dough yield (150-180), substrate for cell cultivation (mMRS or SDB media) and phase of cell growth (exponential or stationary phases) on the kinetics of acidification was also determined. Lactobacillus casei DPPMA27, Weissella confusa DPPMA20 and Lactobacillus fructivorans DPPMA8 were selected and used to produce a defined multi-species semi-liquid sourdough starter. Fermentation was carried out in a 2l batch fermentation bioreactor (12 h at 37 degrees C), under controlled pH, by cultivating cells in a medium made of water (60%), flour and other nutrients (40%). The semi-liquid sourdough starter was stored for 30 days under different conditions and used for dough fermentation (dough yield 160). The microbial composition, acidifying activity and fermentation end-products were kept constant during 21 days of storage. The findings of this study may be useful to increase the use of sourdough in bakery industries.     

Application of brown-rot basidiomycete Fomitopsis sp. IMER2 for biological treatment of black liquor

Acid-producing fungi can be used for the treatment of black liquor by biological acidification for the precipitation of alkali lignin. The effects of alkali lignin obtained from black liquor on the growth, acid-producing capacity and glucose consumption of a brown-rot fungus Fomitopsis sp. IMER2 were investigated and the changes in the functional group in the resulting alkali lignin were analyzed by Fourier transform infrared (FTIR) spectroscopy. Although the presence of alkali lignin inhibited fungal growth and acid production, it enhanced glucose consumption. This suggests that the physiological response of this fungus to stress induced by alkali lignin is unique. Furthermore, the analysis of the effects of the resulting alkali lignin on the growth rate showed that several functional groups were evidently improved for the use of available resources.     

水解酸化-UASB-低压射流曝气工艺处理废纸制浆造纸废水

采用水解酸化-UASB-低压射流曝气工艺处理废纸制浆废水,对整个工艺及调试运行过程进行详细介绍并对遇到的问题进行分析。实际运行结果表明,该工艺设计合理,运行稳定可靠,总排放口出水COD≤90mg·L-1、SS≤50mg·L-1、BOD5≤20mg·L-1,出水水质可达到《造纸工业水污染排放标准》(GB3544-2008)的要求。     

开发区工业废水处理厂提标改造工程实例

针对开发区工业废水水质复杂,可生化性较差的特点,通过采取增加水解酸化段,将传统AO工艺改造为MBBR工艺,增建臭氧氧化-BAF深度处理工艺等措施对园区污水厂进行提标改造。改造后运行结果显示,出水CODCr、NH3-N、TN质量浓度分别为38~45、0.5~7.5、10~14 mg/L,稳定达到GB 18918—2002《城镇污水处理厂污染物排放标准》一级A标准的要求。主要介绍了改造后的工艺流程,给出了主要构筑物的设计参数及设备配置。     

混凝-缺氧-好氧工艺处理纺织印染废水

采用混凝－－水争酸化－－生物接触氧化工艺流程处理纺织印染废水,处理量４０００ｍ＾３／ｄ,进水ＣＯｃｒ１０００～３０００ｍｇ／Ｌ、色度４５１２～１０２４倍、ＰＨ１１～１３。从１９９８年７月开始运行至今,ＣＯＤｃｒ平均去除经为９２．３２％,色度平均去除率为９２．１９％,出水Ｐ来７,出水各项指标均符合《纺织染整工业水污染物排放标准》ＧＢ４２８７～１９９２一组标准的要求,运行结果表明,该工艺处理效果稳定、     

微好氧与厌氧水解酸化对明胶废水的预处理效果

以明胶废水为研究对象,采用微好氧与厌氧水解酸化工艺进行对比处理实验,探讨了不同水力停留时间下微好氧与厌氧水解酸化对明胶废水水质改善的效果。实验结果表明,在水力停留时间达到72h的时候,溶解氧为1.3~1.6mg/L的微好氧反应器的COD去除率最大可达25%,溶解氧为0.3~0.5mg/L的厌氧反应器的COD去除率最大可达22%;微好氧反应器的VFA的含量达到12mg/L左右,厌氧反应器只有8mg/L左右;微好氧反应器的pH值可由最初的12.5降至7.5左右,而厌氧反应器只能降至8.0左右;两个反应器对蛋白质去除效果的差别并不明显,都可以达到90%以上,但是微好氧反应器的氨氮浓度只有22mg/L,小于厌氧反应器中的氨氮浓度,说明微氧条件有利于氨氮的扩散挥发,低浓度的氨氮对微生物的危害较小。对比得出微好氧反应器的出水水质较好,更适合明胶废水水解酸化的预处理。     

溶胶法制白炭黑工艺研究

以水玻璃和硫酸为原料,工艺过程中首先制备硅溶胶作为母液,继续反应完成白炭黑的合成过程,反应pH值为9.0～10.5。所得固体悬浮液经酸化、过滤、洗涤、干燥和粉碎得到白炭黑产品。该方法工艺过程简单,易于操作,所得产品质量稳定,性能优良。     

乳品废水的处理方法

乳品废水具有有机物浓度高,SS和油脂含量高,营养物质浓度高的特点,但是可生化性好,适宜生化法处理。对乳品废水的水质特点、处理工艺中的主要因素以及国内常用的处理方法进行综述。     

A Discussion of the Compound Sand Control Technique of High Pressure Packing and Moderate Acidification

Acidification can both eliminate formation damage and improve flow passage, which can be good for improving single well productivity. Based on this, the authors bring up the thought of moderate acidification technique for sandstone reservoir, and combine it with high pressure packing technique, and one step further, presents a compound sand control technique of high pressure packing and moderate acidification. At the same time, the authors preliminarily discuss the main points of this technique and analyze its mechanism of sand control and yield increase as well as its adaptability. The main purpose of this technique is to clean out the clay and mud in the immediate vicinity of wellbore, decrease the fine content or the particle size in that area, enlarge the seepage channel, and fill in optimized gravel, so as to make it conducive for transpiring the fine sand in the formation and keeping the gravel layer unblocked, as a result making the sand control life prolonged and single-well productivity raised. The keys of this compound technique are moderate acidification and gravel size optimization.