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The characteristics of water quality
The main pollutants are organic pollutants such as ammonia nitrogen, nitrite, phosphorus feed residue and excrement of aquatic animals and drug contamination introduced by disease prevention and control.
There are many kinds of organisms and the tolerance to various physical and chemical indicators is different. The sudden change of water quality easily destroys the ecological balance.
There is a lot of sediment and contains a lot of organic pollutants.
Treatment methods need to take the safety of farmed organisms into account.
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Conventional processing methods and their limitations
Conventional processing method
(1) Physical adsorption: zeolite powder, activated carbon, etc. can adsorb ammonia nitrogen and nitrite in water.
(2) Flocculation: chemical preparations such as aluminum sulfate and ferric chloride. Its polymeric nature allows concentrated sedimentation of suspended particulates in water.
(3) Chemical agent to change the bottom: chlorine dioxide, potassium persulfate composite salt, oxidative deposition of organic matter, increase the oxidation-reduction potential of the bottom of the pool and reduce harmful pathogens.
(4) Natural purification: the aquaculture wastewater is discharged to a purification pond with a low aquaculture quantity but a perfect ecosystem and is recycled after it reaches the ideal water quality standard.
The limitations of conventional processes
(1) Physical adsorption: it only concentrates the pollutants, settles them to the bottom of the pool and fails to remove the pollution away from the aquaculture water body. It can only solve the urgent need and can’t solve real problems fundamentally. It also causes the potential danger of anoxia deficit, black and stinky bottom in the late aquaculture.
(2) Flocculation: it need large dosage, have low flocculation effect with shortcomings of high cost, strong corrosiveness and metal residue.
(3) Chemical agents to change the bottom: it has a short duration, can’t achieve long-term prevention with low safety. It is easy to cause stress and even death of farming organisms.
(4) Natural purification: it wastes a lot of space and requires a long time for purification.
(5) Most of the households do not have the habit of using microbes to transfer water and only use it after problems occurring in the water.
Ecological treatment methods and characteristics
Ecological treatment method
(1) Running throughout the whole breeding process, the water is treated before seeding release and the BZT microbial agent is used regularly to regulate water quality throughout the breeding process.
(2) Forming a breeding habit on the basis of prevention, keeping water quality and sediment quality stable, fluctuations in physical and chemical indicators of water bodies is little with less incidence of farmed animals, high feed utilization rate and good quality of farmed animals.
The characteristics of ecological treatment methods
(1) Low cost, no toxic side effects and no residue, it can be used throughout the breeding process.
(2) Microecological preparations can colonize the culture environment, enhance the stability of the ecosystem, reduce the stress response caused by rapid changes in water quality, inhibit the reproduction of harmful algae and pathogens and play a role of long-term preventive.
(3) It can improve the intestinal microenvironment of farmed animals, enhance digestion and absorption of feed and increase the feed efficiency rate.
(4) Microecological preparations are rich in nutrients and can be transmitted to the cultured objects through the biological chain to enhance the resistance of the cultured objects.
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