如果水系统内的碎片继续造成污染，则需要在防回流阀总成的上游安装一个过滤器。
If debris in the water system continues to cause fouling, a strainer can be installed upstream of the backflow assembly.
系列709双止回阀总成适用于防止受到污染的水回流进入到饮用水系统中。
Series 709 Double Check Valve Assemblies are designed to prevent the reverse flow of polluted water from entering into the potable water system.
其功能在于防止污染水回流到饮用水供应系统中，这些装置不需要对改变管线，只需要直接螺纹旋在洒水龙头上即可。
Designed to prevent the flow of contaminated water back into the potable water supply, these devices require no plumbing changes, and screw directly onto a sill cock.
此外，在紧急回流或出现水锤现象时，如果第二止回阀受到污染，则这种安全阀可能出现释放（喷溅）。
Otherwise, such relief ( spitting) can occur when the second check is fouled during emergency backflow or resulting from a water hammer condition.
在相关的交叉连接处应该安装一个双止回阀总成，以防止受到污染的水回流到饮用水系统中。
Double Check Valve Assembly shall be installed at referenced cross-connections to prevent the backflow of polluted water into the potable water supply.
垃圾填埋场渗滤液回流能有效降低渗滤液中污染物的浓度，提高填埋场稳定化程度，具有广泛的应用前景。
Leachate recycling waste landfills can reduce the concentration of contamination in leachate and improve waste landfills stabilization, so, this Technique will be applied broadly in future.
该工艺在传统的化学混凝的基础上将沉淀池内的污泥回流至化学生物絮凝池，利用化学混凝和污泥吸附的协同作用去除污水中的污染物。
The cycle sludge was pumped to chemical biological flocculation tank and the pollutants were removed by co-operation of chemical coagulation and biological adsorption.
建议在防回流阀前安装一个过滤器，防止止回阀受到污染和阀门在再增压期间出现泄漏或溢出。
The installation of a strainer ahead of the backflow preventer is recommended to prevent fouling of the check assembly and resultant spillage from the valve during repressurizing.
酒糟废液的全回流发酵，可以减少由酒糟带来的环境污染，节约大量的淡水资源。
The recycling of distillage produced by industrial fermentation may help to reduce its environmental impact, and limit waste water emission.
针对季节性氨氮和有机微污染水源，通过回流生物预处理后沉淀池生物污泥至絮凝池，进行常规生物强化处理。
For seasonal ammonia and organic micro-polluted raw water, biological sludge in sedimentation tank following bio-pretreatment was returned to flocculation tank, to enhance conventional process.
针对季节性氨氮和有机微污染水源，通过回流生物预处理后沉淀池生物污泥至絮凝池，进行常规生物强化处理。
For seasonal ammonia and organic micro-polluted raw water, biological sludge in sedimentation tank following bio-pretreatment was returned to flocculation tank, to enhance conventional process.
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