厌氧与曝气处理制革废水的CODcr

CODcr with anaerobic and aeration treatment in leather wastewater

对不同工段的皮革废水进行厌氧处理,测定CODcr含量;对无铬的浸酸废水和含铬的浸酸废水进行曝气厌氧组合处理,测定CODcr。结果表明:硫化物含量稍高的废水,如浸灰废水,厌氧细菌作用的初始时间更长,但是CODcr去除率比较高,本身易产生微生物的软化废水CODcr去除率也高。而铬盐对厌氧处理来说没有明显的抑制作用,对于曝气处理来说,CODcr初期下降速度比较快,到一定程度后,CODcr不再有明显的下降。通过先曝气再厌氧和先厌氧再曝气的对比试验,发现前者优点显著,处理速度快,CODcr去除率更高。

The different section wastewater was treated by anaerobic method and determined chemical oxygen dosage （CODcr）. The pickled wastewater chrome and chrome - free CODcr contents with aeration- anaerobic and anaerobic- aeration treatment were measured. The results indicated that if the concentration of the sulphide in the wastewater is high, such as liming wastewater, it will take a little long time to make the anaerobic bacteriatotake good effect, but the degree of the CODcr - reduction will be higher. Bated wastewater can introduce microorganism easily, so the rate of CODcr- reduction is higher. The experiments also found that the chrome salt didn＇t restrain the anaerobic treatment obviously. However, in the beginning CODcr will decrease quickly with aeration treatment, then the situation will stable. Comparison the aeration- anaerobic with anaerobic- aeration treatments, aeration-anaerobic is better with quick speed and high CODcr reduction.