| 1. | Sludge liquor is recirculated in the secondary system .
污泥水回流到二级处理系统。 |
| 2. | Sludge liquor is recirculated in the secondary system to assure its purity before discharge .
该泥水回流到二级处理系统，以保证排放前的澄清度。 |
| 3. | Treating combined sewage effluent from a secondary treatment plant, the process achieved 94.5% cadmium removal for the trace quantities present .
用这种方法处理二级处理厂排出的综合下水，可除去水中含镉量的94.5。 |
| 4. | Secondary treatment of sewage
二级处理污水 |
| 5. | Aerobic secondary treatment
需氧二级处理 |
| 6. | Secondary treatment sewage
二级处理 |
| 7. | Treating combined sewage effluent from a secondary treatment plant , the process achieved 94 . 5 % cadmium removal for the trace quantities present
用这种方法处理二级处理厂排出的综合下水，可除去水中含镉量的94 . 5 。 |
| 8. | Secondary treatment is the biological treatment that controls the environment for growing enough quantity of microorganisms to degrade organic substances in the wastewater followed by separating the microorganisms from the treated liquid to achieve the objective of purification . the biological treatment can be either aerobic or anaerobic
二级处理通常系指生物处理而言，主要原理在于控制及培养一定数量之微生物，利用微生物生长代谢作用，来分解去除废水中的有机物，再将处理水和微生物分离，并废弃增殖过剩之微生物量，而达到净化水质之目的。 |
| 9. | Generally speaking , the treatment can be carried out in combinations of pre - treatment , primary treatment , secondary treatment and advanced treatment and the application depends on the available raw water quality and the required finished water qualities as well as economic considerations
总之，用水及废污水的处理技术大致上可分为前处理、初级处理、二级处理及高级处理等处理方式，依据各种不同的原水水质及处理水水质之要求，以及经济有效的考量下，选择适当的处理程序组合进行处理。 |
