The hydrolytic acidification - oxygen filling film filterpond is used in a sewage treatment plant.
某污水处理厂采用了水解酸化—充氧膜滤池工艺。
2
An experiment in field and artificial penetration-filterpond test both were conducted to show factors affecting content of nitrate-nitrogen in soil in the present study.
采用田间试验及人工渗滤池试验方法,研究了土壤中硝态氮含量的影响因素。
3
While not strictly necessary, your pond can benefit from having a pump and biological filter to keep water cleaner.