气浮的分类和适用范围

⑴分类：

①电解气浮法：运行时借助电极解作用，在两个电极区不断产生氢、氧和氯气等微气泡，废水中的悬浮颗粒黏附于气泡上上浮到水面而被去除。工艺简单，设备小，但电耗大。

②散气气浮法：是空气通过微细孔扩散装置或微孔管或叶轮后，以微小气泡的形式分布在污水中进行气浮处理的过程。

优点：简单易行。

缺点：气泡较大，气浮效果不好。

③溶气气浮法：

包括加压溶气气浮和溶气真空气浮，加压溶气气浮是空气在加压条件下溶于水中，而在常压下析出。（国内外较常用）

溶气真空气浮是空气在常压或加压条件下溶于水中，在负压条件下析出。

⑵（气浮法）适用范围：

①分离悬浮油和乳化油

②可代替活性污泥法的二沉池对曝气池出流混合液进行固液分离

③可分离工业废水中的有用物质（如纸浆）

④可分离以分子或离子状态存在的物质（如金属离子、表面活性物质等）

3.加压溶气气浮法

⑴系统组成：包括溶气系统、空气释放装置、气浮设备池

⑵工艺流程分类：

①全溶气流程②部分溶气流程③回流加压溶气流程

⑶溶气方式：

水泵吸水管吸气溶气方式、水泵压水管射流溶气方式和水泵-空气压缩机组合溶气方式

⑷加压溶气气浮的优点：

①加压情况下，水中空气溶解度大，能提供足够的溶气量，以满足不同的气浮要求；

②突然减压释放产生的气泡直径小（20～100 ），粒径均匀，微气泡上浮稳定，对液体的扰动小，特别适用于松散絮体和细小颗粒的固液分离；

③流程简单，维护管理方便。

⑸气浮池形式：

①平流式气浮池：

被处理的废水由池一端的下部进入接触区，微气泡与废水进行均匀混合，使其中的悬浮颗粒黏附于气泡上，废水经隔板进入气浮分离区进行分离后，水中污染物随气泡一起上浮到水面上，经刮渣设备刮除。

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 The classification of air flotation and the applicable scope

(1) classification:

Japanese float: (1) electricity run time with the aid of electrode solution, in two electrode area continuously produce the micro bubbles, such as hydrogen, oxygen and chlorine in the wastewater suspended particles adhere on the bubbles rise to the surface and be removed. With simple technology and equipment, but the power consumption.

(2) the spread of gas gas float: is the air through the tiny pore diffusion device or microporous tube or after impeller, in the form of tiny bubbles distribution gas floating in the water treatment process.

Advantages: simple and feasible.

Disadvantages: large bubbles, air flotation effect is not good.

(3) gas dissolved air flotation:

Including pressurized dissolved air flotation and dissolved air air float, pressurized dissolved air flotation is under the condition of pressurized soluble in water, air and precipitation under atmospheric pressure. (more commonly used at home and abroad)

Dissolved air air float is under the condition of normal pressure or pressurizing air dissolve in the water, precipitation under the negative pressure condition.

2 (air float) scope of application:

(1) the separation of suspended oil and emulsified oil

(2) it can replace the second pond activated sludge process of aeration tank discharge mixture for solid-liquid separation

(3) to isolate useful substances in industrial wastewater (such as pulp)

(4) can be separated to exist molecules or ions in a material (such as metal ions, such as surface active substance)

3. The pressurized dissolved air flotation

(1) system: including dissolved air system, air release device, gas pool

2 process classification:

(1) all dissolved air flow (2) part of the dissolved air flow (3) backflow pressurized dissolved air flow

(3) dissolved air way:

Breathe in water pump suction pipe dissolved air way, water jet pump pressure pipe dissolved air way and the way of dissolved air pump, air compressor combination

(4) pressurized dissolved air flotation of advantages:

(1) pressure, air solubility in water, can provide enough dissolved gas, in order to meet different gas float requirements;

(2) all of a sudden stress release of small air bubble diameter (20 ~ 100), particle size uniform, microbubble floatation stability, small disturbance to the liquid, especially suitable for loose flocs and tiny particles of solid liquid separation;

(3) the process is simple, easy to maintenance and management.

5] air flotation pool form:

1) flat flow gas float pool:

Treated waste water from the bottom of the pool side into the contact area, micro air bubble mixing with water, make the suspended particles adhesion on the bubble, waste water, after separation through partition into air flotation separation zone, with bubbles rise to the surface of the water, the water pollutants by scraping the slag shave their equipment.