请问：去除COD什么方法最高效?水存放时间的长短对COD有影响吗?

With the continuous improvement of waste water discharge standards,research and development of new highly efficient,complex treatment process is imperative.From the 20th century,70's,some European companies,universities began to study moving bed biofilm reactor (Moving Bed Biofilm Reactor,referred to as MBBR) new wastewater treatment technology.The filling process using a new suspension,absorbing the traditional bed and biological contact oxidation of both strengths,as an effective sewage treatment.MBBR in Europe and the United States has been widely used in processing food,paper,chemical,refinery production of wastewater.Many examples show that the method works very good treatment effect.This article describes MBBR in Waste Water Treatment of practical application case,experiments show that a higher MBBR on COD removal,maintained in 58% of the year,and in winter (22-27 ℃) in summer (35-40 ℃),the temperature on the COD removal rate MBBR not affected.大体意思是对的,细节处语法问题自己修改下.问题不大如果我的回答可以帮到你的话,万分感谢\(^o^)/
（1）衣服会变黄,多半是荧光剂变弱所致,想要衣物恢复洁白亮丽,就得想法子.洗米水+橘子皮简单又有效：保留洗米水或是将橘子皮放入锅内加水烧煮后,将泛黄的衣服浸泡其中搓洗就可以轻松让衣服恢复洁白.不但简单,也不像市面贩售的荧光增白剂会对皮肤产生副作用且不伤衣料,是值得一试的好方法.流汗产生的黄渍,用氨水去除：流汗产生的汗渍,因为含有脂肪的汗液,容易在布质纤维内凝结,所以在洗涤时加入约2汤匙的氨水,浸泡几分钟后,搓洗一下,然后用清水洗净,依照一般的洗衣程序处理,就可以将黄黄的汗渍去除喽!（2）有时,白色的衣服或浅颜色的衣服日久颜色会变黄,引起白色或浅色衣服泛黄的主要原因是人身体分泌的油脂,特别是聚酯面料的衣物,更易泛黄.另外还有洗涤时残留的肥渣滓（最明显的见于尾酮亚麻纤维）,如果没有冲洗干净,会使衣服大面积的变黄.对于这一现象是有方法可以去掉的,例如在洗涤耐高温水洗的衣服时,大量的使用清洁剂.一个传统的办法是将泛黄的衣服在烈日下悬挂暴晒,但在此之前,应在泛黄处上新鲜的柠檬汁,再放些盐并轻轻的揉搓.警告：要小心操作,避免使用氯漂剂.斯潘德克斯弹性纤维、丝绸、羊毛等面料,接触氯漂剂会使其更黄.白衣服巧洗保洁白 ◆ 滴墨水法：在一盆干净的凉水中,滴3－5滴纯蓝墨水,用手搅匀,然后把洗漂干净的白衬衫放进水中,上下提拉3－5次,捞出晾干.◆ 加双氧水法：漂白丝、毛织物,可用3%浓度的双氧水,液量为织物重量的10倍,另加少许氨水使其带弱碱性,在一般室温下浸漂5－10小时后,洗净晾干.◆ 加柠檬汁法：洗白色丝织物时,在水里加点柠檬汁,可使衣物更加洁白.◆ 脱脂牛奶浸泡法：在洗白色丝织物前用脱脂牛奶泡一下,或最后一次漂洗时在水里加2汤匙牛奶,可保持白色丝织物的本色,防止其变黄.◆ 萝卜汤洗涤法：白衣物如污垢较多,可用萝卜汤来洗,可洁白如新.◆ 橘皮水浸泡法：洗涤白色衣物时,可将橘皮放入锅里加热烧沸,用那黄色汤水浸泡、搓洗衣服,便可使衣物洁白如新.