water standards meaning in English

水质标准

Drinking - water standard under the guidelines of the world health organization
世界卫生用水水质指引
Study of stability aroused by frequency conversion in system of water standard device
水流量标准装置中变频调速对装置稳定性的研究
The measured values coincide well with the simulated ones . the result shows that as to cod and tp , the water quality is up - to the water standard , while to tn , it is not . seawater has been badly polluted in the north - east of jiaozhou bay
大沽河、墨水河和李村河入海口附近水质超四类海水水质标准( gb3097 - 1997 ) ：娄山河、红岛沿岸海域水质超过三类海水水质标准；胶州湾超一类水域的面积占湾内面积的64 。
The effective regeneration procedure is soaking the adsorbent 30 ~ 50h with 1 - 2 % al2 ( so4 ) 3 for activated alumina and 20 ~ 30h with 1 - 1 . 5 % naoh for bone char . studies show both activated alumina and bone char are excellent adsorbents for the removal of fluoride from drinking water . fluoride concentration below 1 . 0mg / l can be acquired easily with them and meets the requirement of drinking water standards
对两种除氟剂进行的再生液与吸附剂体积比为1 : 1的再生实验表明：用硫酸铝溶液对活性氧化铝再生，再生浓度为1 2 ，再生时间为30 50h ，冲洗浸泡时间为5h效果较好；对骨炭再生，氢氧化钠再生液浓度为1 1 . 5 ，再生时间为20 30h效果较好。