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由于蛔虫病是人体最常见的一种疾病,而且感染率高,尤以儿童为最,因此所有的医院污水中均含有蛔虫卵,有时还有其他蠕虫卵。不过由于医院用水量多,污水稀释度大,而且蛔虫卵比水重,在水中易于下沉,所以单位容积污水中查出的蛔虫卵数未必会比生活污水中的多,大部分虫卵都集中在沉渣和污泥中。所以医院污水在排放或利用于灌溉之前,必须经过沉淀池的预处理,使虫卵沉淀下来。而沉淀污泥目前在我国还是农业上很好的有机肥料,应该加以充分利用,但用作肥料的污泥如不经过无害化处理,势必污染环境,并传播疾病。在制订医院污水污泥排放标准时,考虑应以蛔虫卵作为卫生蠕虫学指标,因为医院污水中普遍含有蛔虫卵,而沉淀污泥中含量更大,蛔虫卵的生命力比其它任何蠕虫卵都
Because ascariasis are the most common diseases in the human body and have a high prevalence, especially in children, all hospital sewage contains Ascaris eggs and sometimes other worm eggs. However, due to hospital water consumption, sewage dilution, and Ascaris eggs than water, easy to sink in water, so per unit volume of Ascaris eggs found in sewage may not be more than in domestic sewage, most of the eggs are Concentrated in sediment and sludge. Therefore, the hospital sewage in the discharge or utilization of irrigation before, must be pre-treated sedimentation tank, so that the eggs settle down. However, sedimentation sludge is still a very good organic fertilizer in our country at present, and should be fully utilized. However, sludge that is used as fertilizer will inevitably pollute the environment and spread diseases if it is not decontaminated. In the development of hospital sewage sludge discharge standards, consideration should be given as a helminth worm helminthological indicators, because the hospital sewage generally contain Ascaris eggs, sediment sludge and more content, the vitality of Ascaris eggs than any other worm eggs are