共查询到20条相似文献，搜索用时 109 毫秒
1.
采用UASB反应器处理亚麻沤制废水,水力停留时间为24 h,进水COD浓度为6000～7100 mg.L-1时,出水COD浓度降低到2000 mg.L-1左右,COD去除率达到60%以上;沤麻废水经UASB处理后再回用于沤麻,沤麻过程中COD和pH的变化趋势与只用自来水沤麻相似,当COD小于2000 mg.L-1时,脱胶时间为80 h左右,比自然脱胶时间缩短10 h,而COD大于2000 mg.L-1时,脱胶时间反而比自然脱胶长,表明沤麻废水经处理COD在2000 mg.L-1以内再回用于沤麻是可行的。 相似文献
2.
为研究畜禽粪便厌氧发酵产沼气时,不同类型粪便的交替发酵对反应体系性能的影响,进行了牛粪和猪粪这两种最典型粪便的连续交替发酵实验。实验阶段,水力停留时间(HRT)为5天,第1~18天,进料为猪粪,COD先为5000 mg·L-1,后提高到10000 mg·L-1。第19~42天,交替进料为牛粪,COD先为10000 mg·L-1,后提高到15000 mg·L-1。结果表明,进料猪粪时的COD去除率为75%~88%,产气6~9 L·d-1,pH值波动范围大,增大负荷后,罐体容易酸化。而交替成牛粪后的COD去除率下降至60%,产气3~5 L·d-1,pH值经短暂缓冲后迅速恢复稳定在6.8~7.0,罐体耐负荷冲击能力较强,不易酸化。整个粪便交替过程中,产甲烷含量较高,CO2没有积累,菌群结构基本稳定,反应器运行正常,可通过提高负荷得到更高的甲烷产量。 相似文献
3.
4.
酒精糟废水厌氧—好氧生物处理的研究 总被引：5，自引：0，他引：5
笔者对酒精糟废水进行了中温普通消化法间歇式模型试验,中温厌氧(UASB 反应器)——好氧连续流生物处理试验.试验得到 UASB 进水负荷为40kgCOD/m~3·d,COD 去除率达到95%,沼气产气率达到20m~3/m~3(池)·d,好氧处理后出水 BOD_5降低到60mg/l 以下,COD 可降低到200mg/l 以下,系统 COD 总去除率达到99%以上。处理1m~3废水可回收沼气17m~3。 相似文献
5.
6.
聚酯废水处理的设计与调试 总被引：5，自引：0，他引：5
聚酯废水是一种较难处理的高浓度废水,本文介绍了一种采用UASB(升流式厌氧污泥床反应器)+活性污泥法为主的工艺处理聚酯废水的工程实例.实践证明当进水COD6000mg*L-1,BOD52400mg*L-1左右时,经本工艺处理后出水COD小于150mg*L-1,完全可以达到排放标准.这种方法操作方便,运行管理简单. 相似文献
7.
8.
9.
聚醚多元醇生产高浓度有机废水可生化性差,目前还没有相关处理报道。本文介绍了采用EGSB厌氧反应器和生物接触氧化工艺两者相结合的方法处理该类污水的现场试验研究。试验表明,该工艺能够有效地降低废水中的有机物含量,COD总去除率在85%左右,使污水中有机物浓度(COD)从3000~5000 mg.L-1降低到530 mg.L-1。 相似文献
10.
为解决CRI系统表面易积水、喷头易堵塞和布水均匀性难控制的问题,课题组通过工程实例,以猪场废水厌氧消化液为原水,分析适宜于处理高氨氮废水的CRI系统新型布水方式。工程试验结果表明,强化CRI系统布水方式对猪场废水厌氧消化液具有较好的污染物去除效果。在日处理原水40 t,氨氮为250-350 mg·L-1,COD为650-1000 mg·L-1的条件下,氨氮去除率为84.5%-90.4%;COD去除率为89.5%-91.4%,均达到《畜禽养殖业污染物排放标准》（GB 18596-2001）。 相似文献
11.
12.
13.
14.
15.
《Journal of Agricultural Engineering Research》1998,69(3):249-254
A model to represent the discolouration of dried powder of carrots as a function of temperature was developed. Two types of carrots, Asian and European, containing large amount of lycopene and β-carotene, respectively, were tested. The dried powder was stored under an atmosphere with O2and at three different temperatures, 5,20 and 35°C. The surface colour of the powder was monitored during storage by a Hunter colour ratioa/b. In the proposed model, the rate of oxidation was assumed to be represented by the product of the fraction of concentration of oxidized pigment at arbitrary time and a specific rate of oxidation of pigment. The rate parameters in the proposed model were calculated by fitting the experimental data with smooth curves by trial and error at the end of the induction period but before discolouration took place. The frequency constant and activation energy, expressing the temperature dependence of the rate parameters, were expressed by the Arrhenius relation. The simulation results of a Hunter colour ratioa/bof dried powder at 25°C showed good agreement with the experimental data, suggesting that the proposed model was effective for the prediction of discolouration of dried powder of both types of carrot. The use of the induction period in the manner described may enable the shelf life of dried powder to be predicted. 相似文献
16.
17.
18.
The fractional outflow rate of water from the rumen, measured as the rate of disappearance of the chromium complex of ethylenediamine tetra-acetic acid, was related to a number of dietary factors. A multiple regression equation was derived which expressed fractional outflow rate as a function of the intakes of dry matter, ash, acid-detergent fibre and crude protein.The data analysed consisted of 243 observations for sheep on 59 diets, including forage, concentrate and mixed diets. The ranges covered by the data were: fractional outflow rate 0.7–3.6 day?1; dry matter intake 560–1400g/day; ash 4–30%, acid-detergent fibre 7–41%, crude protein 5–26 % of dry matter; there were no observations for sheep of less than 34 kg liveweight.The equation accounted for 56·3 % of the total variance. Between-sheep variance could not be calculated for the whole of the data but was undoubtedly substantial since, for a sixth of the data, it was known to account for 38 % of the total variance. 相似文献
19.
感官检验棉花的品级,这是农村常见的一种检测手段.它的一个主要特点就是存在不确定性.这是由于检验员的品级检验水平存在一定的差异,其中有很多因素制约着检验的结果.文章对影响感官检验结果的因素进行了系统的分析. 相似文献
20.
从灾害经济学的角度探讨了城镇供水优化调度的必要性和可能性，认为在缺水不可避免的情况下，对供水进行优化调度可以减小缺水带来的损失，产生较好的减灾效益，特别是可以大大减小严重干旱的灾害效应。并根据水资源的特性，提出了缺水损失的计算模式以及优化调度的原则和方法。 相似文献