1. 外观形状：无尖粒状，对水流阻力小，不易堵塞，布水布气均匀；表面粗糙，挂膜速度快 ，反冲洗时微生物膜不易脱落。
2. 多孔性：火山岩是天然蜂窝多孔，是菌胶团是佳的生长环境。
3. 机械强度：经国家质检部门为 7.08mpa ，实践证明可以耐得住不同强度的水力剪切作用，使用寿命远远长了其它滤料。
4. 密度：密度适中，反冲洗时容易悬浮且不跑料，可以节能降耗。

◆火山岩生物滤料的各项化学性质：

化学成份如下：

1. 生物化学稳定性：火山岩生物滤料抗腐蚀，具有惰性，在环境中不参与生物膜的生物化学反应。
2. 表面电性与亲水性：火山岩生物滤料表面带有正电荷，有利于微生物固着生长，亲水性强，附着的生物膜量多且速度快。
3. 对生物膜活性的影响方面：作为生物膜载体，火山岩生物滤料对所固定的微生物无害、无抑制性作用，实践证明不影响微生物的活性。

◆火山岩生物滤料的水力学特性：

1 、空隙率：内外平均孔隙率在 80% 左右，对水的阻力小，同时与同类滤料相比，所需滤料量少，同样能达到预期过滤目标。
2 、比表面积：比表面积大、开孔率高且惰性，有利于微生物的接触挂膜和生长，保持较多的微生物量，有利于微生物代谢过程中所需的氧气与营养物质及代谢产生的废物的传质过程。
3 、滤料形状与水的流态：由于火山岩生物滤料是无尖粒状，且孔径大多数比陶粒要大，所以在使用时对水流的阻力小，节省能耗。

the volcanic rock hangs the membrane biology to filter highly effective expects the volcanic rock to hang the membrane biology to filter the material highly effective to apply most early in overseas, our country once imported the volcanic rock to filter the material to take the water treatment biology carrier. the tianjin branch skill environmental protection material limited company according to the domestic and foreign technological development condition, cooperates with the domestic and foreign colleague expert, in domestic seeks to suits the processing volcanic rock to filter the material raw material. after selection processing, working procedure processings and so on biological activation become, apparent is the anomalous pellet, the color is the vandyck brown. the porous nature is light. the pellet particle size may act according to the different request to carry on the production. uses this living thing to filter the material, processing may the biochemistry organic industrial waste, the municipal administration sewage, lives mixed draining water, the micro pollution water source water and so on. the volcanic rock biology filters the material realizes the aeration biofilter sewage treatment craft key material, this product and the traditional biological ceramsite compares, not only has the quality of material to be light, the chemical stability is good, intensity being suitable, merits and so on surface roughness yi guamo, moreover the hole is developed, the distribution is reasonable, very suitable microorganism"s vaccination, domestication, reproduction growth. bears the flushing, not to stop up, has the good physics, chemistry and the hydraulic characteristic, may adapt in the different sewage purification request. because should filter the material to be bigger than the surface area, may accumulate highly concentrated the microorganism quantity, the highly concentrated microorganism causes the aeration biofilter"s volume load to increase, the elimination rate is high. the unit volume sewage treatment efficiency ratio convention filters the material to enhance 5-7 times, may satisfy the environmental protection emission standard. this product passes through “the ministry of construction water treatment to filter the material quality surveillance to examine the center” the examination, the target is fine, perform reliably.

the volcanic rock biology filters the material the hydraulics characteristic: 1, percentage of voids: the inside and outside average factors of porosity about 80%, the adding water resistance are small, simultaneously with similar filters the material to compare, must filter estimates few, similarly can achieve the anticipated filtration goal. 2, ratio surface area: is bigger than the surface area, the percentage open area is higher than, and the inertia, is advantageous in microorganism"s contact hangs the membrane and the growth, maintains the many microorganism quantities, the waste mass transfer process which in the microorganism metabolism process is advantageous needs the oxygen which and the nutrients and metabolism produce. 3, filters the material shape and the water fluid state: because the volcanic rock biology filters the material does not have the point granular, and the aperture majority must be bigger than the ceramsite, therefore in use time is small to the fluent resistance, saves the energy consumption