基于机械淘洗的活性初沉池碳源转化与回收评价

发布时间：2018-01-12 18:38

本文关键词：基于机械淘洗的活性初沉池碳源转化与回收评价　出处：《中国给水排水》2016年17期 　论文类型：期刊论文

【摘要】：针对我国污水处理厂进水碳氮比值失调、初沉池中颗粒态碳源流失严重导致生物系统脱氮除磷碳源不足的问题,开展了传统初沉池运行效果评价与活性初沉池碳源转化回收技术研究。结果表明,传统初沉池对COD的去除率达到40.49%,其中对颗粒态COD的去除率更是高达56.27%,初沉池中大量碳源的无效流失导致生物系统进水碳氮比值与碳磷比值明显降低。而在活性初沉池中试系统中,由于大量污泥在池底部长期积累,有利于水解发酵细菌的繁殖与富集。高通量测序分析结果显示,Proteobacteria(34.17%)、Bacteroidetes(22.22%)、Chloroflexi(13.29%)是活性初沉池系统中的优势种群。活性初沉池系统使初沉污泥中微生物种群结构发生了显著的变化,而这种变化有利于初沉污泥水解发酵的进行。通过微生物的水解发酵及机械搅拌单元的淘洗作用,活性初沉池出水SCOD与VFAs可分别增加51.7 mg/L和18.8 mg/L,经过活性初沉池后污水的SCOD/TN值和SCOD/TP值可分别提高40.9%和41.8%。活性初沉池系统可有效减少污水中碳源流失,实现对颗粒态碳源的原位转化与回收。
[Abstract]:Aiming at the imbalance of carbon to nitrogen ratio in the influent of wastewater treatment plants in China, the loss of particulate carbon sources in primary settling tanks has seriously led to the shortage of carbon sources for nitrogen and phosphorus removal in biological systems. The evaluation of operation effect of traditional primary settling tank and the study of carbon source conversion and recovery technology of active primary settling tank were carried out. The results showed that the COD removal rate of traditional primary settling tank was up to 40.49%. The removal rate of granular COD is as high as 56.27%. The ineffective loss of a large number of carbon sources in the primary settling tank led to a significant decrease in the ratio of carbon to nitrogen and carbon to phosphorus in the inlet water of the biological system, while in the pilot system of the active primary settling tank, a large amount of sludge accumulated at the bottom of the tank for a long time. High throughput sequencing analysis showed that Proteobacteria was 34.17%. Bacteroidetes22.22. Chloroflexium 13.29) is the dominant population in the active primary settling tank system, and the microbial population structure in the primary settling sludge is changed significantly by the active settling tank system. This change is beneficial to the hydrolysis and fermentation of primary settling sludge, and through the hydrolysis and fermentation of microorganism and the washing of mechanical agitation unit. The effluent SCOD and VFAs of active primary settling tank increased by 51.7 mg/L and 18.8 mg/L, respectively. The SCOD/TN value and SCOD/TP value of the sewage after the activated primary settling tank can be increased by 40.9% and 41.8 respectively. The carbon source loss in the sewage can be effectively reduced by the active primary settling tank system. The in situ conversion and recovery of particulate carbon sources are realized.
【作者单位】：徐州工业职业技术学院建筑工程学院;
【分类号】：X703
【正文快照】： 目前我国城市污水处理厂主要采用活性污泥工艺,生物脱氮及厌氧释磷过程需要有机碳源,碳源的种类及含量直接影响生物系统的脱氮除磷效果,这在低碳氮比值污水处理厂表现得尤为明显。随着污水处理厂出水水质标准的不断提高,碳源不足的问题更加突出,碳源不足已经成为限制提高污水

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