63 results about "Long-term experiment" patented technology

The invention relates to an anaerobic zero-valent iron sewage treatment method, belonging to the sewage treatment technical field. The anaerobic zero-valent iron sewage treatment places zero-valent iron in an anaerobic reactor and utilizes the environmental conditions of the anaerobic isolated air to largely reduce the formation rate of the rust of zero-valent iron and avoid the formation of hardening; meanwhile, the method uses the reducing action of metal iron to increase the anaerobic reductive atmosphere, balance the pH and increase the effect of the anaerobic organism. A circulating pumpis adopted for sewage backflow so as to increase the overflow load of an iron / activated carbon layer and the reaction effect of zero-valent iron, improve the fluidization effect of sludge to increasethe anaerobic process efficiency. In a sewage treatment system, ferrous iron contained in the discharged sewage is oxidized to Fe(OH)3 with the air and the coagulation generated in the process can further purify the sewage. Long-term experiment research shows that the decolorizing rate of the sewage treatment method for dye wastewater can teach 85%-95%, the COD can be reduced by more than 50% andthe biodegradability can be increased to more than 0.3.

A method for artificial breeding of bream, relating to the field of aquaculture, comprising the following steps: carrying out cleaning pond disinfection treatment on fish ponds before stocking fish fry; injecting water into the fish pond; stocking fish fry after water injection for one week; stocking shrimp and snails in the fish pond; Feed mixed feed with a protein content of 32% to 34%; according to the water quality of the fish pond, use quicklime to control the water quality at an amount of 10 to 20 kg per mu; regularly add fresh water to the fish pond. In the artificial breeding method for bream provided by the invention, additives are added to the compound feed, which has the effect of attracting food and promoting growth. The raw material source of the additive is stable, which can meet the smell and taste requirements of bream for the compound feed, and obviously speed up the feeding speed and improve the feeding rate. The effective ingredients and ratio of this feed additive have been optimized by the inventor in long-term experiments, which can significantly improve the anti-stress ability and growth rate of bream while strengthening the food attractant, and reduce the feed coefficient at the same time; the long-term use of this feed additive Safe and efficient, no toxic side effects.

The invention belongs to the technical field of chemical, and in particular, relates to an experimental platform for chemical experiments for high school students, wherein the experimental platform comprises a platform body; a supporting mechanism is fixedly connected at the lower end of the platform body, a lifting mechanism is arranged at the upper end of the supporting mechanism, and the upperend of the lifting mechanism is fixedly connected with the lower end of the platform body; the upper end of the platform body is provided with a storage mechanism and a cleaning mechanism; the storagemechanism and the cleaning mechanism are respectively arranged near the left edge and the right edge of the platform body; the upper end of the platform body is provided with a placement groove whichis located between the storage mechanism and the cleaning mechanism, and the bottom of the placement groove is fixedly connected with a supporting member; the upper end of the supporting member runsthrough a notch of the placement groove and extends to the outer side of the placement groove. The experimental platform has the advantages that unused and used chemical instruments are simply protected against being easy to break and overturn, and the height is adjusted at the same time so as to match students with different height to carry out chemical experiments, so that bodies are not easy tostiffen and ache during long-term experiments.