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Production of soluble microbial products and their impact on anaerobic treatment.

机译：可溶性微生物产品的生产及其对厌氧处理的影响。

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摘要

Anaerobic batch-fed enrichment reactors and chemostats fed glucose or acetate were used to investigate the production and characteristics of soluble microbial products (SMP). Solids retention times of 15, 25, and 40 days were used with organic loading rates of 0.25 and 0.50 g COD/L-day. Results showed that as SRT increased, production of SMP increased. Systems fed glucose produced more SMP than those fed acetate. The fraction of influent COD converted to SMP ranged from 0.2 to 1.0% for acetate systems and from 0.6 to 2.5% for glucose systems. The fraction of effluent COD comprised of SMP in chemostats fed glucose ranged from 81 to 97% and increased with increasing SRT.; The distribution of SMP among three MW categories (MW {dollar}<{dollar} 1000, 1000 {dollar}<{dollar} MW {dollar}<{dollar} 10,000, and MW {dollar}>{dollar} 10,000) was bimodal with the lowest SMP levels falling in the 1000 {dollar}<{dollar} MW {dollar}<{dollar} 10,000 category. The fraction of SMP with MW {dollar}>{dollar} 10,000 increased with increasing SRT. The stability constant for SMP with Ni was approximately 10{dollar}sp{lcub}3.62{rcub}{dollar}, the total SMP-ligand concentration ranged from 0.07-1.33 mM Ni, and the complexation capacity ranged from 0.65 to 5.97 {dollar}mu{dollar}mole Ni/mg SMP. In general, the total SMP-ligand concentration increased with increasing SRT.; Chemostats fed glucose were dosed with 50, 150, or 250 mg Ni/L to investigate the role SMP plays in reducing metal toxicity. SMP quantity and character remained essentially constant in response to the 50 mg Ni/L dose. For the higher Ni doses, significantly higher levels of SMP were produced. The MW distribution of SMP shifted from predominantly high-MW ({dollar}>{dollar}10,000) to low-MW (MW {dollar}<{dollar} 1000). A significant proportion of the soluble nickel was found to be associated with SMP of MW {dollar}>{dollar} 1000 in the systems with 40-day SRT. There was no significant change in the Ni-chelating properties of SMP. However, SMP did have a significant impact on process performance in that it accounted for at least 8 to 43% of the soluble Ni in the reactors.
机译：厌氧分批进料的浓缩反应器和加有葡萄糖或乙酸盐的恒化器用于研究可溶性微生物产物（SMP）的生产和特性。固体保留时间为15、25和40天，有机负载率为0.25和0.50 g COD / L天。结果表明，随着SRT的增加，SMP的产量增加。饲喂葡萄糖的系统比饲喂乙酸的系统产生更多的SMP。对于醋酸盐系统，进水COD转化为SMP的比例为0.2％至1.0％，对于葡萄糖系统为0.6％至2.5％。补充了葡萄糖的恒化器中由SMP组成的废水COD的比例为81％至97％，并且随着SRT的增加而增加。 SMP在三个MW类别（MW {美元} <{dollar} 1000、1000 {美元} <{dollar} MW {美元} <{美元} 10,000和MW {美元}> {美元} 10,000）中的分布是双峰的SMP最低的类别为10,000 {dollar} <{dollar} MW {dollar} <{dollar} 10,000。 MW {dollar}> {dollar} 10,000的SMP分数随SRT的增加而增加。含SMP的SMP的稳定常数约为10 {dollar} sp {lcub} 3.62 {rcub} {dollar}，总SMP配体浓度范围为0.07-1.33 mM Ni，络合能力范围为0.65至5.97 {dollar }μmol{摩尔} Ni / mg SMP。通常，总SMP配体浓度随SRT的增加而增加。给化粪池喂葡萄糖的剂量为50、150或250 mg Ni / L，以研究SMP在降低金属毒性中的作用。响应50 mg Ni / L剂量，SMP的数量和特性基本保持恒定。对于更高的镍剂量，产生了更高水平的SMP。 SMP的MW分布从主要的高MW（{dollar}> {dollar} 10,000）变为低MW（MW {dollar} <{dollar} 1000）。在具有40天SRT的系统中，发现有很大比例的可溶性镍与MW {dollar}> {dollar} 1000的SMP有关。 SMP的镍螯合性能没有明显变化。但是，SMP确实对工艺性能产生了重大影响，因为它至少占反应器中可溶性Ni的8％至43％。

著录项

  • 作者

    Kuo, Wen-Chien Walter.;

  • 作者单位

    The University of Iowa.;

  • 授予单位 The University of Iowa.;
  • 学科 Engineering Sanitary and Municipal.
  • 学位 Ph.D.
  • 年度 1993
  • 页码 219 p.
  • 总页数 219
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;
  • 关键词

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