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Finally, the effect of the complete recycling use of distilled effluent on ethanol fermentation was examined in order to save the cost for the treatment of waste distillage and promote cleansing production. Based on the data of 13 circulations, although the average fermentation time needed to be extended to 30~40 hours, over 12.5% ethanol was achieved, at the same time, residual reducing sugar and total sugar were maintained below 0.70% and 0.90%, which indicates that the negative effect of the completely recycling use of waste distillage was limited, and the waste distillage can be completely recycled within the fermentation system.

在此基础上,从减轻废糟液处理负荷,实现清洁生产的需要出发,进行了无种子罐条件下酒精蒸馏废液直接全循环使用的自絮凝颗粒酵母酒精连续发酵实验研究,十三次全循环运行得到的实验数据,与无废液循环的实验结果相比,虽然平均发酵时间略增至30h~40h,但发酵终点酒精浓度仍达到12.5%以上,残还原糖和残总糖分别在0.70%和0.90%以下,说明循环积累物对发酵的影响有限,废糟液直接全循环使用的工艺技术路线可行。

Self-flocculating yeast ; continuous ethanol fermentation ; distillage recycling ; total solids

絮凝酵母;乙醇连续发酵;废糟液全循环;总固形物

Potentially, distillage could be fully recycled during continuous ethanol fermentation using self-flocculating yeast cells as yeast cells were self-immobilized and less inhibitory by-products were expected in the waste distillage.

本文针对酒精发酵行业现有废糟液治理技术存在设备投资大、运行能耗高的突出缺点,以玉米粉为原料,双酶法制糖,在自絮凝颗粒酵母酒精连续发酵系统中耦合了废糟液直接全循环使用清洁生产技术。

The result shows that dregginess can be checked by blowdown photoelectricity sensor after high density organic waste water enter pool,and dregginess is excluded out of pool by dredg...

结果表明,高浓度有机废水流进沉淀池中,排污光电传感器+排污泵可把检测到的沉淀物排出沉淀池,而池中上清液被浑水光电传感器,清水泵和上浮球把检测到的上清液水排入过滤装置内进行过滤,随后加入絮凝剂进行沉淀分离,再经消毒以达到二次水利用的目的成为现实。

It contains much!turmeric ramification,which is dyeable and difficult dedradable surfactant,and its biodegradability is not good.

黄姜工业废水经Feton试剂氧化、Ca2中和及PAM絮凝沉淀处理,有很好的脱色及COD去除效果。

Electrostriction and electrocoagulation promote condensation,rapid precipitation and dewatering so as to avoid using costly macromolecular electrolyte and chemicals.

电压缩和电絮凝促进凝结、快速沉淀及脱水,且不使用昂贵的高分子电解质和化学药品,也不需使用复杂且易于被超细微粒堵塞的过滤系统。

At the same time, dewatering mechanism was also studied elementarily.

同时,还对污泥絮凝脱水机理进行了一定的探讨。

The sludge settling characteristic is satisfying with SV varying from 22 to 30 and SVI varying from 58 to 80ml/g.The sludge bulking problem has been avoided successfully. The excess sludge can be thickened to 3%-4 %. The alkalinity remains equilibrious between the nitrification and denitrification in SBR-BAF system. The COD and TP loading of SBR are 2.08kgCOD/kgMLSS·d and 41.68gTP/kgMLSS·d, respectively. The NH4+-N loading of BAF is 1.16kgNH_4~+-N/m~3.d. The total HRT is about 10 hours which is only about half of suspended growth process for simultaneous phosphorous and nitrogen removal. Under the above mentioned high loadings and short HRT, the mean removal efficiency of COD, TP, NH4+-N, TN is 96%, 98%, 93%, and 84%, respectively. The mean effluent concentration of COD, TP, NH4+-N, TN, SS is 20mg/L, 0.23 mg/L, 3.24 mg/L, 7.68 mg/L, 5 mg/L respectively, which means every index can meet the first class of Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant.

最后,以上述最佳运行参数控制SBR-BAF系统运行,长期运行结果表明:系统中悬浮污泥的絮凝、沉降性能良好,SV值为22~30,SVI值为58~80,不再有污泥膨胀之虞,而且可以对剩余污泥进行重力浓缩,浓缩后污泥浓度可以达到3~4%;短程硝化和反硝化使得系统可以维持碱度平衡,无需额外补充碱度;系统在高负荷(SBR反应器COD负荷为2.08kgCOD/kgMLSS.d,TP负荷为41.68gTP/kgMLSS.d,BAF反应器NH4+-N负荷为1.16kgNH_4~+-N/m~3.d)、低水力停留时间(SBR反应器9h,BAF反应器1h,总计10h,约为同步脱氮除磷悬浮污泥工艺的一半)下稳定高效运行,对COD(不计BAF加入的外碳源)、TP、NH_4~+-N、TN的平均去除率为96%、98%、93%、84%,出水COD、TP、NH4+-N、TN、SS的平均浓度为20mg/L、0.23 mg/L、3.24 mg/L、7.68 mg/L、5 mg/L,各项水质指标均达到《城镇污水处理厂污染物排放标准》(GB 18918-2002 )一级标准的A标准的要求。

Several flocculants and the conditions in which they were more effective were studied in fermentation medium of recombinant Erwinia carotovora-Eccl3B.

首次在转基因欧文氏工程菌发酵液体系下,对絮凝剂作了筛选,并对其最佳作用条件进行了研究。

In order to cutting down the cost, flocculation of recombined Erwinia carotovora-Eccl3B cell from broth, influence of temperature, pH and oxidants on the separation of PHB were studied; and the method which measure the molecular weight of PHB by intrinsic viscosity was also studied; furthermore, a phenomenon was found that insolubility of PHB in chloroform can be changed by pretreated at over 120℃ for the fist time, and the mechanism of this phenomenon was explored.

为了降低成本,提高生产效率,本文针对发酵法生产PHB过程中存在的,发酵液难以分离沉淀,非有机溶剂提取PHB时分子量严重降低等问题,进行了发酵液的絮凝,及温度、pH、氧化剂对提取PHB影响的研究。并对粘度法测定PHB分子量的方法进行了研究,同时,对于研究过程中发现的,加热后PHB在三氯甲烷中的溶解性变化及其原因进行了探索。

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I didn't watch TV last night, because it .

昨晚我没有看电视,因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来,在北京的很多小区里,电梯液晶电视被撤了下来。

I'm running my simile to an extreme.

我比喻得过头了。