Volcanic rock

Volcanic rocks (volcanic pumice, basalt) are characterized by many pores, light weight, high strength, heat preservation, heat insulation, sound absorption, fire prevention, acid and alkali resistance, corrosion resistance, and no pollution, no radioactivity, etc., which is an ideal natural green , Environmentally friendly and energy-saving raw materials.

Physical characteristics of volcanic rock biofilter

1. Appearance and shape: no sharp granular shape, small resistance to water flow, not easy to block, uniform water and air distribution; rough surface, fast film hanging speed, microbial film is not easy to fall off when repeated washing.

2. Porosity: volcanic rock is natural honeycomb porous, which is the growth environment of bacterial micelles.

3. Mechanical strength: 5.08Mpa by the national quality inspection department. Practice has proved that it can withstand hydraulic shearing of different strengths, and the service life is much longer than other filter materials.

4. Density: The density is moderate, it is easy to suspend and does not run out during backwashing, which can save energy and reduce consumption.

Chemical characteristics of volcanic rock biofilter

The chemical composition is as follows:

Chemical composition SiO2 CaO MgO Fe2O3 FeO Al2O3 TiO2 K2O Na2O

Content% 53.82 8.36 2.46 9.08 1.12 16.89 0.06 2.30 2.55

1. Biochemical stability: The volcanic rock biofilter material is corrosion-resistant, inert, and does not participate in the biochemical reaction of the biofilm in the environment.

2. Surface electrical and hydrophilicity: The surface of the volcanic rock biological filter material has a positive charge, which is conducive to the fixed growth of microorganisms. It has strong hydrophilicity and attaches a large amount of biofilm and is fast.

3. The impact on biofilm activity: as a biofilm carrier, volcanic rock biofilter material is harmless and non-inhibiting to the fixed microorganisms, and it has been proved that it does not affect the activity of microorganisms.

Hydraulic characteristics of volcanic rock biofilter:

1. Porosity: The internal and external average porosity is about 40%, and the resistance to water is small. At the same time, compared with similar filter materials, the amount of filter material required is small, and the expected filtration target can also be achieved.

2. Specific surface area: large specific surface area, high open porosity and inertness, which is conducive to the contact and growth of microbes, maintains a large amount of microorganisms, and is conducive to the oxygen and nutrients needed in the process of microbial metabolism and the production of metabolism The mass transfer process of waste.

3. The shape of the filter material and the flow state of the water: Because the volcanic rock biological filter material is non-pointed granular, and the pore size is mostly larger than that of ceramsite, it has low resistance to water flow during use and saves energy consumption.

effect

The role of volcanic rock 1: living water.Volcanic rocks can activate the ions in the water (mainly increase the content of oxygen ions) and can slightly release a-rays and infrared rays, which are good for fish, including humans.The disinfection effect of volcanic rocks is also not to be ignored. Adding to the aquarium can effectively prevent problems.

The role of volcanic rocks 2: Stabilize water quality.

There are two parts here: PH stability, which can adjust the water that is too acidic or too alkaline to be close to neutral automatically.The mineral content is stable, volcanic rock has the dual characteristics of releasing mineral elements and absorbing impurities in the water. When it is too little or too much, its release and adsorption will occur.The stability of the PH value of water quality when Luohan starts and increases color is of vital importance.

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The role of volcanic stone 3: seductive color.

The volcanic stone is bright and natural in color. It has a significant lure effect on many ornamental fishes such as Luohan, red horse, parrot, red dragon, Sanhu cichlid, etc. Especially Luohan has the characteristics of the color close to the surrounding objects, and the red color of volcanic rock It will induce Luohan's color to gradually redden.

The role of volcanic stone 4: adsorption.

Volcanic rock is porous and has a large surface area. It can absorb harmful bacteria in the water and heavy metal ions that affect organisms such as chromium and arsenic, and even some residual chlorine in the water.Placing volcanic rocks in the aquarium can absorb the residue and feces that the filter cannot absorb to keep the water in the tank clean.

The role of volcanic stone 5: play props.

Most fish, especially Arhats, are not polycultured. They will also be lonely and lonely. Arhats have the habit of playing with stones to build their homes. Therefore, the light weight of volcanic rocks has become a good prop for it to play.

The role of volcanic stone 6: to promote metabolism.

The trace elements released by volcanic stone can promote the metabolism of animal cells, and bring out harmful halides in the body, and clean up the dirty things in the cells..

The role of volcanic stone 7: optimize growth.

Volcanic stone can also increase protein synthesis in animals, enhance immunity, and increase Lohan's mobility to a certain extent.This also played a big role when Luo Han started.

The role of volcanic rocks 8: the cultivation of nitrifying bacteria.

The high surface area produced by the porosity of volcanic rock is a good hotbed for cultivating nitrifying bacteria in water, and its surface is positively charged to facilitate the fixed growth of microorganisms. It has strong hydrophilicity and can reduce the NO2 and NH4 that are caused by various reasons in the water, which are very toxic to vertebrates. Conversion into NO3 with relatively low toxicity can greatly improve water quality

The role of volcanic rock 9: the substrate material for the growth of aquatic plants

Due to its porous characteristics, it is conducive to aquatic plants' grasping and rooting and solidification. The various mineral components dissolved in the stone itself are not only conducive to the growth of fish, but also can provide fertilizer for the aquatic plants.In agricultural production, volcanic rocks are used as soilless culture substrates, fertilizers and animal feed additives.

Use attention

1 As the volcanic rock is broken and transported in large pieces, some residues and other sundries powder will be generated due to friction and impact. Directly entering the tank will cause the water to become turbid. Please soak in clean water for 24 hours and then wash it for several times. , The residues such as minerals in the stone hole and other chemical components in the packaging process can be filtered out, and then they can be put into the tank for use.

2 Volcanic stone generally has the effect of softening the pH value and alkalinity. Generally speaking, it is acidic.However, it does not rule out the alkalinity caused by special water quality and other filter materials. Please always test the pH value in the tank during the initial period of placement, so as to avoid special circumstances causing damage to the fish seedlings.Under normal circumstances, the influence of volcanic rocks on the pH value of water is between 0.3 and 0.5.

3 After 3-6 months of use, due to the consumption of minerals in the volcanic stone, it is recommended to replace the volcanic stone with a new one.You can also use saturated salt water to soak the used volcanic stone for 30 hours, and then use water to wash off the impurities thoroughly before continuing to use.This is the so-called volcanic rock reconstruction process.(Saturated salt water refers to the mixed solution of water and salt when table salt is continuously added to the water and the table salt is continuously melted until the added table salt no longer melts.)

Volcanic stone, medical stone and ammonia-absorbing zeolite are non-toxic and odor-free natural non-metal filtering mineral materials, which can be used in free combination, or placed for special fish species, and have gradually become popular in the field of ornamental aquariums.At this stage, volcanic rocks are mainly used by aquarium players in cultivating nitrifying bacteria and filtering, and creating natural color-enhancing environment for fish.It can be used as bottom sand directly on the bottom of the tank or installed in the filtration circulation system.The quantity to be used can be determined according to issues such as the type of fish, the number of fish, the proportion of other filter materials, and the size of the fish tank.Don't be too superstitious and rely on a certain filter material, and should be used in a variety of combinations.

Physical performance index:

Performance index test results

Bulk density 430-870Kg/m

Water absorption 11.7-17.03%

Loose bulk density 520Kg/m

Cylinder compression strength 1.218Mpa

Moisture content 1%

Mechanical strength 5.08Mpa

Thermal conductivity 0.326w/(m﹒ k)

Apparent density 640-860/(390 Ⅹ 240 Ⅹ 190)Kg/m

Hollow rate 48/(390 Ⅹ 240 Ⅹ 190)%