77 results about "Periphyton" patented technology

The invention relates to a method for realizing ecological larval culture on rapana venosa. The method is characterized by comprising the following steps of: firstly selecting a pond which is convenient in water exchange, takes lithoherm and stone bottom as a substrate and is in the size of 2-5Mu; then placing mature rapana venosa with the length of 7-10cm into the pond in the quantity of 100kg per Mu, mating and spawning after the rapana venosa eats ruditapes and mussel for 2-3 days, when enough oocysts are obtained, removing the rapana venosa away, incubating the oocysts for 20-22 days at the water temperature of 20-25 DEG C to obtain planktonic larva, growing the planktonic larva by eating the planktonic larva in the pond, starting to throwing polyethylene corrugated plate adherence ortile under the condition that the water temperature is 22-25 DEG C after 15-16 days, sticking benthic diatom and the planktonic larva onto the polyethylene corrugated plate or tile, transfigurating the planktonic larva of the rapana venosa into young spiral shell after 5-6 days, growing the transfigurated young spiral shell by eating the planktonic larva and benthic diatom on the corrugated plate, wherein the survival rate of the transfigurated young spiral shell on the corrugated plate can reach more than 50%, and feeding small low-value bivalve to the young spiral shell with the length morethan or equal to 3mm. By applying the method provided by the invention, the defects that the survival rate is low and the larval yield is low as bait conversion is difficult and water is polluted when carnivorous fish mice are used as feed in indoor artificial larval culture can be overcome, and the larval yield is improved by more than 50% compared with the indoor artificial larval culture. Meanwhile, the production cost is saved as no bait is thrown into the pond, thus the method is environment-friendly, and the produced larval is strong.

The invention discloses a method using scratching fish and periphyton for combined control of lake eutrophication. The method comprises the steps of investigating the quantity of periphyton in a lake, arranging artificial substrates, selecting scratching fish, fishing scratching fish and the like. According to the method, by utilizing the characteristic that periphyton has high absorptivity for nitrogen and phosphorus in a water body, the artificial substrates are arranged to enlarge the quantity of periphyton in the water body so as to increase the amount of absorption and conversion of nitrogen and phosphorus in the water body, and as the baits of scratching fish are exactly periphyton on various substrates, the fishery productivity of the water body can be improved by breeding a certain quantity of scratching fish which has the feeding habit characteristic of being capable of scratching periphyton on various substrates; meanwhile, the concentration of nitrogen and phosphorus nutrient substances in the water body can be reduced, so that the method not only has ecological efficiency, but also brings certain economic benefits. Therefore, the effect of comprehensive optimization of ecological efficiency and economic benefits is achieved.

The invention discloses a method and a device for culturing periphyton. The method for culturing the periphyton comprises the following steps: (1), preparation of a modified carrier, wherein the carrier more favorable for periphyton adhesion is prepared by modifying agricultural byproducts; (2) periphyton culture, wherein water flow is controlled through a floating valve, nourishment is supplied through drip irrigation, and secondary metabolites of the periphyton are taken away while the nourishment in a periphyton culture tank meets microbial growth, so that the periphyton can be massively propagated; (3) control on a key environmental condition, wherein efficient periphyton culture is realized by controlling growth influence factors of the periphyton. The device is capable of automatically controlling sample introduction and realizing integration of periphyton culture and reaction. The selected materials can be all obtained locally and are low in cost and remarkable in effect; the method is suitable for efficient periphyton culture and provides a scientific basis for promotion of application of the periphyton to the natural water body remediation and agricultural area-source pollution control.

The invention designs a semi-closed floating type multi-layer ecological culture water tank. The water tank comprises a water tank floating ring, an upper-layer filtering water permeable ring, a watertank upper-edge water partition ring, an upper-layer grating plate, a sealed water tank vertical wall, a middle-layer grating plate, a bottom-layer grating plate, a conical water tank bottom, a sewage discharge filtering cover, a sewage storage tank, an inflation system, a sewage discharge system and a bait feeding system. By using the water tank, planktonic feeding fishes are stocked in an upper-layer culture area, feed eating fishes are stocked in a middle-layer culture area, and bottom fishes are stocked in a bottom-layer culture area. An inflation system is used for conducting inflation and oxygen enrichment on a water area of the water tank, a bait feeding system is used for feeding bait, residual bait enters the bottom-layer culture area to be eaten by the bottom fishes, fish manureand other pollutants are accumulated in the sewage storage tank, and the accumulated pollutants are discharged out through a sewage discharge pump. At the same time, the upper-layer filtering water permeable ring on the upper portion of the water tank body filters surrounding water when the pollutants are discharged, the water then enters the water tank body, only a small amount of water needs tobe supplemented, the culture waste pollutants are extracted from the water area for discharging, the surrounding environment of the culture areas is not influenced, and the requirements for ecological and environmental protection are met.

Periphyton filtration is a known method for performing bioremediation of polluted water, removing nutrients from the influent on which the attached algae thrive. The present system improves upon this method by establishing a water-treatment facility for adding a strong oxidizer to the influent, and, in some cases, to the effluent, to make organically bound nutrients available to a target culture of periphyton or aquatic plants to reduce the population of undesirable microinvertebrates, to make organically bound nutrients available to the periphyton, and to reduce the level of toxic compounds. A particular embodiment comprises ozonating the water. A pesticide may be added to control insect populations.

The invention belongs to the field of aquaculture techniques, particularly an environment-friendly ecological culture method. The method is characterized in that: mussels are cultured in the upper layer of the water body, edible fish is cultured in the lower layer of the water body; the mussels and the edible fish are cultured in the same water body; the edible fish is fed with the fish feed added in the water body; the organic substances in the feces excreted in the growth of the edible fish and the floating organisms serve as feed for the mussels; a fish pond automatic feed dispenser is fixed in the mussel-fish polyculture water body to feed fish on the schedule, thereby establishing conditioned reflex in fish; and a fixed fishing net cage is arranged in the zone free of nacre during the process of throwing the fish feed. Based on the food chain of the aquatic animals in the water body, the method can produce aquatic products such as nacre and establish the ecological positive circulation in the water body. Additionally, the culture method facilitates the fish harvest by adopting a certain fishing method and has high practicability and effectiveness.

The invention discloses a method for promoting phosphorus removal by stimulating periphyton through AHLs quorum sensing signal molecules and a biological phosphorus removal system, and belongs to thetechnical field of sewage treatment. In a periphyton culture stage and a sewage purification operation stage after culture is finished, AHLs quorum sensing signal molecules are added into a periphytonreactor so that quorum sensing which is crucial to periphyton formation is promoted, microorganism interspecific cooperation is promoted, and the activity of microorganisms is stimulated. An AHLs signal molecule mixture with a certain concentration and a certain proportion is added into theperiphyton reactor so that the fixed growth process of periphyton is accelerated, the biomass is improved, and the phosphorus removal capacity of a periphyton system is optimized. The method has the characteristics of simple process operation requirements, high stability, high treatment efficiency and low investment cost and is suitable for removing and capturing phosphorus in high-concentration phosphorus sewage.