Raw water pretreatment is also called feed water pretreatment in water industry. In water treatment, advanced treatment system often has certain water quality requirements for influent. In order to prolong the period and service life of the system and prevent the damage of the system, the quality of the influent water is generally improved as far as possible. Only after proper pretreatment can the raw water meet the water quality requirements of the back-channel water-making equipment system. Therefore, according to the different contents of suspended particles, carbonate hardness, organic matter content and free chlorine in raw water, it is necessary to adopt different pretreatment methods.

無論是直接采用離子交換系統(tǒng)或者先用電滲析法(EDI)，再加上反滲透的系統(tǒng)，普通的自來水、地下水或工業(yè)用水往往都不能夠滿足離子交換樹脂或反滲透膜對(duì)玷污物質(zhì)的進(jìn)水要求。原水只有經(jīng)過適當(dāng)?shù)念A(yù)處理后，方能滿足后道制水制備系統(tǒng)對(duì)進(jìn)水的水質(zhì)要求。

Whether directly using ion exchange system or electrodialysis (EDI) first, coupled with reverse osmosis system, ordinary tap water, groundwater or industrial water often can not meet the requirements of ion exchange resin or reverse osmosis membrane for fouling materials. Only after proper pretreatment can raw water meet the water quality requirements of the back-channel water preparation system.

常用原水預(yù)處理方法：

Commonly used raw water pretreatment methods:

通過在原水中投加高分子物質(zhì)（絮凝劑），使水體中細(xì)小而松散的絮粒變的粗大而密實(shí)，便于快速沉淀。

By adding macromolecule substance (flocculant) in raw water, the fine and loose flocs in water become coarse and dense, which is convenient for rapid precipitation.

然后就用到了多介質(zhì)過濾器，一般過濾器內(nèi)裝有大小不同、種類不同的精制濾料，從上到下、由小到大依次排列，能去除水體中的懸浮物、泥沙、粘土、腐殖物等，使出水濁度達(dá)到理想效果。常用的多介質(zhì)過濾器填料為石英砂。

Then a multi-media filter is used. Generally, there are different sizes and types of refined filters in the filters. They are arranged from top to bottom and from small to large, which can remove suspended matter, sediment, clay, humus and so on in the water body, and make the turbidity of the effluent reach the ideal effect. Quartz sand is commonly used as filler for multi-media filter.

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