Methods for Removal of Wastes and Odours.pptVIP

Methods for Removal of Wastes and Odours 顾倩 给水110201 （c） Key words: Chlorine [kl?rin] 氯 Chlorine dioxide 二氧化氯 sodium [s??d??m] 钠 sodium chlorite 亚氯酸钠 oxidizing agent [ɑks?,da?z??] 氧化剂 Chlorine dioxide ,formed by adding sodium chlorite to chlorine solution is a stonger oxidizing agent than chlorine and is sometimes found more effective than super chlorination. 二氧化氯是把亚氯酸钠加到氯的溶液中形成的，是一 个比氯气更强的氧化剂并且有时被发现比加氯消毒更 高效。 （d） Key words: dechlorination [di:,kl?:rinei??n] 脱氯 sodium thiosulphate [,θai?us?lfeit] 硫代硫酸钠 sulphur [s?lf?] dioxide 二氧化硫 sterilising [ster?la?z??] agent 灭菌剂 Dechlorination ,by the addition of sodium thiosulphate for small supplies,and sulphur dioxide (as a gas) for large supplies, is again a negative way of avoiding taste troubles by removing any free chlorine from a water.As a result there is no sterilising agent left in the water. 脱氯作用，对于小型工厂是通过投加硫代硫酸钠，对于大型工厂 是投加二氧化硫，通过去除水中所有的自由氯来避免味道问题是 一种消极做法。导致水中没有任何剩下任何灭菌剂。 (e) Key words: Aeration [e??re???n] 曝气 palatability [p?l?t?biliti] 适口性 stagnant [st?gn?nt] 污浊的 sulphuretted hydrogen [ha?dr?d?(?)n]硫化氢 Aeration will normally improve the appearance of a water which is poor in palatability ,or stagnant .The particular use of aeration is to get rid of sulphureteed hygrogen smells found in deep well water . Key words: precipitate [pr?s?p?te?t] out 沉淀析出 filtration [f?ltre??n] 过滤 organic [??g?n?k] pollution 有机污染物 If iron is present in the water this may precipitate out as a result of the aeration ,and filtration will then be necessary .Aeration is seldom effective when tastes are caused by organic pollution. 如果铁存在于水中可能因为曝气而析出，此时过滤就是必不可少的。 当有机物引起的味道问题，曝气是很少有效的。 曝气通常改善在适口性或者浑浊度较差的水的外貌。曝气的通常用 途是去除在深水井中被发现的硫化氢的气味。