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Effect of bio-surfactant on municipal solid waste composting process

机译:生物表面活性剂对城市生活垃圾堆肥过程的影响

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Bio-surfactant is a new type of surfactant that is produced in microbial metabolism. Adding bio-surfactant during composting process, especially to those contain some toxic substances, has been proved to be a promising way. In this study, Strains II (2), a bacterial with high activity to produce bio-surfactant, were isolated firstly. Following comparison experiments with and without adding Strains HI (2), namely Run 1 and Run R, were conducted, respectively. The experimental results showed that, by adding Strains III (2), the surface tension could reduce from 46.5 mN/m to 39.8 mN/m and the corresponding time to maintain the surface tension under 50 mN/ m could prolong from 60 h to 90 h. The oxygen uptake rate and total accumulated oxygen consumption with Stains 1 (2) were both higher than those without Strains 111(2), while the accumulation of H_2,S in outlet gas was reduced to around 50 percent of Run R. Moreover, two additional experiments were also carried out to examine the effects of strains coming from different systems. One is adding Strains II (2) with a dose of 0.4 percent (Run 2), and the other is seedling commercial Strains at the same conditions, the composting experiments showed that: Run 2 was more effective than Run 3, because the commercial Strains can be suppressed significantly in a complex composting system with different pH, high temperature and some of metals. The bio-surfactant was also added into the solid waste, which contained some toxic substances, the corresponding results showed that the remove rate of Hg and sodium pentachlorophenolate(PCP-Na) could be improved highly. Thus, the microenvironment, reactionrate and composting quality could be enhanced effectively by adding bio-surfactant to the composting process.
机译:生物表面活性剂是在微生物代谢中产生的新型表面活性剂。已经证明在堆肥过程中添加生物表面活性剂,特别是在含有一些有毒物质的表面活性剂中添加生物表面活性剂是一种有前途的方法。在这项研究中,首先分离出了具有高活性的生物素表面活性菌Strains II(2)。在比较实验中,分别进行了添加和不添加菌株HI(2)的实验,即运行1和运行R。实验结果表明,通过添加Strains III(2),表面张力可以从46.5 mN / m降低到39.8 mN / m,并且将表面张力保持在50 mN / m以下的相应时间可以延长60 h至90 H。污渍1(2)的吸氧率和总累积耗氧量均高于无应变111(2),而出口气体中H_2,S的积累减少至运行R的50%左右。此外,两个还进行了其他实验来检查来自不同系统的菌株的影响。一种是添加0.4%剂量的菌株II(2)(实验2),另一种是在相同条件下使用商品化幼苗苗,堆肥实验表明:菌株2比实验3更有效,因为商品菌株在具有不同pH值,高温和某些金属的复杂堆肥系统中,可以显着抑制这种情况。固体废物中还加入了生物表面活性剂,其中含有一些有毒物质,相应的结果表明,汞和五氯酚钠(PCP-Na)的去除率可以大大提高。因此,通过在堆肥过程中加入生物表面活性剂,可以有效提高微环境,反应速率和堆肥质量。

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