采用化学处理方法，对木钙进行改性，对松香进行皂化，并与表面活性剂进行复合。
Adopt the chemical method, carry on the saponification to the lignin sulfonic acid calcium, and compound with the surface-active agent.
重点介绍了目前国内供水行业所采用物理、化学以及生物的方法在水厂净水处理及二次供水过程防除摇蚊污染的研究；
Physical, chemical and biological control methods in the purifying water process and the secondary water supply system in Chinese water supply industry are discussed.
如果必须采取化学或者物理保护方法处理，要选择应用最温和的处理方法。不能采用会损害历史材料的处理方法。
Chemical or physical treatments, if appropriate, will be undertaken using the gentlest means possible. Treatments that cause damage to historic materials will not be used.
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