摘要
本文以武汉晨鸣纸业公司制浆中段废水为研究对象,针对中段废水难降解有机物浓度高,N、P含量低的特点,开展水解酸化-活性污泥法处理试验研究。
文中系统论述了中段废水水解酸化与好氧活性污泥法的基本原理,首先通过水解酸化使中段废水中某些在好氧条件下不易降解的有机物变成小分子可降解物质,好氧活性污泥进一步降解水解酸化后的废水中的有机物。水解酸化-活性污泥法工艺结合厌氧与好氧系统,发挥不同微生物所特有的优点,对去除难降解有机物有良好的应用前景。
本文通过试验确定最佳工艺参数,旨在寻求一种处理中段废水的合理工艺路线,为类似中段废水处理工艺的建造提供一定的理论和实际设计参考数据。试验结果表明:水解酸化预处理能够提高中段废水的可生化性,本试验废水在温度低于40℃,HRT为10h时,水解酸化预处理效果明显,经过处理后,废水中的COD的去除率分别在34%左右;后续活性污泥法的主要工艺参数,曝气时间为12h,混合液中DO为3 mg/L,容积负荷在1.5kgCOD/(m3·d)以下,活性污泥法工艺对COD的去除率在80%左右,最终的处理结果使得COD出水达到排放标准。但当温度高于40℃的时候,整体工艺中段废水中的COD去除率仅为55%左右,出水达不到排放标准。
This paper deals with hydrolysis acidification and activated sludge combined technology to study paper-plant mid-stage wastewater from Wuhan Chen-ming paper- plant, which is characterized as high concentration of undegradable organic compounds and low concentration of nitrogen and phosphorus.
Principles of hydrolysis acidification and activated sludge for treatment of mid-stage wastewater were systemically expatiated. Firstly, hydrolysis acidification was used to change some hard to degradable organic compounds into small molecular and easily decomposed organics. Then aeration was utlized to improve removal rate of contamination in wastewater. Anaerobic-activated sludge combined process could unite anaerobic and anaerobic reaction, taking the advantages of different microbes, which has a good applying prospect to remove high concentration organic compounds.
Optimum process parameters were determinated through experiments. This paper aimed at developing a reasonable technology to dispose paper-plant mid-stage wastewater, offering some theoretical and practical reference data for the process of wastewater like mid-stage wastewater. Experimental results are shown as follows:
Anaerobic pretreatment can increase biochemical quality of mid-stage wastewater, when the temperature is under 40℃and hydraulic retention time(HRT) was 10h, the effect of anaerobic was very distinct. After that, the removal rate of COD is about 34%. The technologic parameters for the latter activated sludge are: hydraulic retention time was 12h, the DO of the intermixed liquid was 3mg/L, volume load was below 1.5kgCOD/m3·d, the removal rate of COD is about 80%. As a result, COD in discharged water is certified. But when the temperature is more than 40℃, the unitary technology’s removal rate of COD is about 55%. The discharged water cannot reach the emission control regulations.
引文
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