Influence of residual milk-clotting enzyme and proteolysis on melting properties of soft cheese

In this work, we assessed the influence of coagulant residual activity and primary proteolysis on Cremoso Argentino cheese melting properties. For that purpose, we made Cremoso soft cheeses using different amounts of coagulant, and also obtained samples in which milk-clotting enzyme was inactivated. Primary proteolysis correlated with residual activity of coagulant in early stages of cheese ripening; however, it was similar in all cheeses after 30 days. The hydrolysis of caseins did not significantly affect the melting ability of the cheeses, expressed as the area increase after heating samples under standardized conditions. Samples with similar proximate composition showed some changes in meltability; those seemed related to pH evolution during ripening.     

Domestic and Industrial Wastewater Treatment with Ozonated Activated Sludge

Poor sludge settleability is a problem encountered in many activated sludge wastewater treatment plants. This study was aimed at combatting the unwanted biological growths at the root of this phenomenon with ozone. Ozone dosed directly into the aeration basins of small activated sludge pilot plants treating both domestic and synthetic fuel wastewaters led to a substantial reduction of the bulking problem even at dosages as low as 6 to 10 mg/L. Ozone did not interfere in the delicate nutrient removal processes and significantly enhanced effluent quality.     

正交试验法混凝处理炼油厂废水的研究

利用正交试验的方法对炼油厂废水的混凝处理最佳试验条件进行了研究。通过三氯化铁和有机助凝剂聚丙烯酰胺(PAM)对炼油厂废水处理效果的研究,证实在混凝试验的影响因素中混凝剂和有机助凝剂的投加量、投加方式及废水pH值都起着重要作用,研究结果表明:在溶液pH值为8.00左右,FeC l3投加量为235.8m g.-L 1,PAM的用量为0.029m g.-L 1,对炼油厂废水处理得到较为满意的效果,原水的浊度为62.0,经处理后水的浊度可达2.3。     

The perils of foreign intervention: the Nile perch disaster for Lake Victoria

The present study involved the use of a pilot scale water treatment plant to treat turbid surface water from a stream using processed Moringa oleifera seed and alum as primary coagulants. At low initial turbidity of 21.5 to 49.3 NTU, residual turbidities of 2.7, 1.8 and 1.4 NTU were achieved after treatment using Moringa oleifera, alum, and alum with Moringa oleifera as coagulant‐aid, respectively. For medium turbidities varying from 51.8 to 114 NTU, lowest residual turbidities of 2.9, 1.2 and 1.4 were achieved after treatment using Moringa oleifera, alum, and alum with Moringa oleifera as coagulant‐aid, respectively. For high turbidity varying from 163 to 494 NTU, minimum residuals of 1.4, 1.9 and 0.9 NTU were achieved after treatment using Moringa oleifera, alum, and alum with Moringa oleifera as coagulant‐aid, respectively. The proposed mechanism for turbidity removal by Moringa oleifera seed in this study is a combination of partial‐charge neutralization and micro‐bridging or an electrostatic patch mechanism based on the results of zeta potential measurements.     

水溶性聚丙烯酰胺处理油漆废水

用水溶性聚丙烯酰胺为主要原料制备消粘剂A组分,并与有机高分子絮凝剂B组分处理"过喷"涂料油漆污水。研究了该凝聚剂的最佳配方和制备工艺条件、组分A与组分B处理油漆污水的用量、探讨了该凝聚剂的作用机理。与传统的凝聚剂相比,漆渣完全脱粘、呈沙土状,漆渣凝聚性好、循环水残渣含量低、循环水澄清透明。吨油污单耗凝聚剂成本为1.7296元,比传统单耗凝聚剂成本下降了13.5%,具有明显经济效益和环保价值。     

凝聚剂的自制途径和方法

介绍了凝聚剂的几种自制途径和方法,对条件适宜的选煤厂有一定指导作用     

寒区给水厂混凝剂投加自动控制系统安装

针对北方地区冬季温度较低等特性 ,总结了给水厂混凝剂投加自动控制系统在安装过程中应注意的问题 ,以使其能获得理想的控制效果     

Effect of different coagulants on the isoflavone levels and physical properties of prepared firm tofu

The objective of this study was to understand the effect of different coagulants in their ability to retain isoflavones in prepared firm tofu. Harovinton beans were processed to obtain soymilk and a specific amount of this soymilk was coagulated using different types of coagulants for the preparation of tofu. A reversed phase high performance liquid chromatographic method was used for determining the concentration of isoflavones in tofu and whey. Quality parameters such as the texture, color and moisture of tofu, prepared from different coagulants were also determined in this study. Tofus coagulated with different coagulants were found to contain different amounts of isoflavones. Calcium sulfate was found to be the most suitable coagulant for tofu making in terms of its high yield, retention of maximum amount of isoflavones and in obtaining a firm, but not hard texture of tofu.     

含氟矿井水处理研究

以平煤八矿矿井水处理为研究对象,通过混凝剂对比试验,确定最优的混凝剂投加方案,以降低矿井水中氟离子含量,达到矿区生产、居民日常生活用水的标准,使矿井水能够综合利用,为矿区创造社会效益、经济效益和环境效益,并为项目的进一步研究提供基础数据.     

聚硫氯化铝和硫酸铝混凝剂使用效果的对比性研究

本文对新型净水剂——聚硫氯化铝和传统的硫酸铝混凝剂的净水效果进行对比研究。聚硫氯化铝在冬季低水温,高氨氮的原水情况下,不仅提高了出厂水水质,而且节省制水成本.并且简化了生产工艺的操作控制,值得推广。