CN1683258A

CN1683258A - Method for purifying rich nutritive water

Info

Publication number: CN1683258A
Application number: CN 200510038462
Authority: CN
Inventors: 刘正文; 李宽意; 胡耀辉
Original assignee: Nanjing Institute of Geography and Limnology of CAS
Current assignee: Nanjing Institute of Geography and Limnology of CAS
Priority date: 2005-03-17
Filing date: 2005-03-17
Publication date: 2005-10-19

Abstract

The method of purifying entrophic water purifying method includes planting floating vegetation common water rathathinth to absorb entrophic salt, raising goose to eat partial common water rathathinth and maintain common water rathathinth covered area accounting for 20-70 %, and raising fish to eat plankton, so as to constitute one floating vegetation-goose-fish system. The method can purify water while producing goose and fish.

Description

A kind of method of purifying eutrophication water body

Technical field

The present invention relates to water body purification, especially a kind of method of purifying eutrophication water body, this method can effectively be improved water body environment, and economic animals such as output fish, goose, belongs to environmental protection and cultural technique field.

Background technology

Eutrophication is the unusual phenomenon that increases owing to aquatic ecosystem primary productivity that the excessive enrichments of nutritive element such as nitrogen, phosphorus in the water bodys such as lake, reservoir cause.Though eutrophication is a natural process, activity of human beings (directly entering water body as a large amount of sanitary sewages) may be quickened this process, and eutrophication in this case is called the cultural eutrophication.The death that causes a large amount of fish of the direct result of eutrophication, and industry, life, irrigation water all had adverse influence.At present, the lake of China existing 65% presents eutrophic state, also has 29% turning to eutrophic state, and the water body in lake eutrophication has become one of great environmental problem that China lake faces.Because nutritive substance is too much in the water body, a large amount of breedings of hydrobiont (as algae, floating vegetation etc.).Algae respiration and a large amount of oxygen of Decomposition consumption of dead algae, cause water body to be in serious anoxic condition, and decomposite poisonous substance matter, thereby cause serious adverse consequences to water quality; For the improvement of eutrophication water, generally take to recover water body aquatic vegetation or utilization Wetlands ecosystems processing eutrophication water, but speed is slower, cost is higher or floor space is bigger.

A kind of pleuston such as Herba Eichhorniae (Eichhornia crassipes), be commonly called as Herba Eichhorniae, water lotus, false narcissus etc.,, can absorb eutrophication composition in the water body based on vegetative propagation, early stage people once cultivated in eutrophication water, utilized its growth to absorb nutritive salt; But find that its speed of growth in eutrophication water is extremely strong, generally in 8 months, just can increase to 600,000 from 10, it is one of the fastest plant of the growth of generally acknowledging, if untimely salvaging can cover the water surface, stop up the river course, influence shipping, hinder irrigation and drainage, hinder current in flood season, final rotting fouled, polluted water, also reduced the penetrativity of light, influenced the growth of benthos, and increased concentration of carbon dioxide in the water water body, reduce output of aquatic products, the anti-harmful organism that is regarded as a kind of contaminate environment is perplexing China overwhelming majority's southern city, and people have hindered brains for harm how to eliminate it.Herba Eichhorniae generally takes regularly to salvage or introduce the method for biological natural enemy, but the loaded down with trivial details cost of fishing job is too high, and biological natural enemy method is not overripened.

Summary of the invention

The objective of the invention is to utilize the Herba Eichhorniae growth to absorb the characteristics of nutritive salt, a kind of method of purifying eutrophication water body is provided, can effectively improve water body environment, and economic animals such as output fish, goose, for purifying of the hypertrophic water system and aquaculture realistic meaning is arranged.

Above-mentioned purpose of the present invention is achieved in that a kind of method of purifying eutrophication water body, it is characterized in that cultivation pleuston Herba Eichhorniae in eutrophication water, utilize the growth of pleuston to absorb nutritive salt, the Herba Eichhorniae area coverage is the 20-70% of the water surface, surpass at 50% o'clock and put into goose class food, described goose class is the goose class of happiness food Herba Eichhorniae such as self-sufficient and strategically located region white goose etc., and the breed quantity of self-sufficient and strategically located region white goose is decided according to the Herba Eichhorniae growing state.Also can put the fish of plankton feeding habit in a suitable place to breed in eutrophication water, utilize fish filter food planktonic organism, described plankton feeding habit fish are silver carp, flathead, tilapia, and the breeding density of fish is 100-500 tail/667m ², stocking size is the 50-300g/ tail, does not throw in addition and raises.

Advantage of the present invention and effect: the present invention is through after secular test and observing, found the goose class of happiness food Herba Eichhorniae, as self-sufficient and strategically located region white goose, and utilize the food chain principle to set up pleuston-goose-fish system, utilize the superpower detergent power of Herba Eichhorniae to absorb nutritive salt, phytoplankton growth also absorbs nutritive salt, utilizes goose class food Herba Eichhorniae, fish filter food planktonic organism, final system output goose, two kinds of economic animals of fish are achieved many things at one stroke.Low, the instant effect of this method cost, and certain economic benefit is arranged, easily promote rapidly.

Embodiment

Embodiment: in Yucheng, Shandong one pond (area 3500m2), the pond is divided into two little ponds with fluid-tight enclosure cloth, a conduct experiment pool, another is the contrast pool.Test pool early May is transplanted Herba Eichhorniae, and the Herba Eichhorniae area coverage is about 30% of the water surface, this moment chemical oxygen demand 12.8mg/L, total nitrogen 7.912.8mg/L, total phosphorus 0.88mg/L, planktonic organism amount 55.0mg/L, Herba Eichhorniae is not transplanted on the contrast pool.The Herba Eichhorniae growth and breeding covers water surface area about 50% in the test pool, puts into self-sufficient and strategically located region white goose food, tests the pool this moment and contrasts pool chemical oxygen demand decline 78%, and total nitrogen descends 66%, and total phosphorus descends 59%, and the planktonic organism amount descends 10%, and effect is obvious.Test the pool mid-August and put into silver carp, bighead again, fish stocking density is 200 tails/667m ², stocking size is the 150g/ tail, and fish are not thrown and raise, and fish is not put on the contrast pool yet.The test pool contrasts pool chemical oxygen demand and descends 88%, and total nitrogen descends 79%, and total phosphorus descends 76%, and the planktonic organism amount descends 71%, and the test water quality relative comparison pool, the pool has clear improvement.

Claims

1, a kind of method of purifying eutrophication water body is characterized in that cultivation pleuston Herba Eichhorniae in eutrophication water, utilizes the growth of pleuston to absorb nutritive salt, and the Herba Eichhorniae area coverage is the 20-70% of the water surface, surpasses at 50% o'clock and puts into goose class food.

2, according to the method for the described purifying eutrophication water body of claim 1, it is characterized in that the goose class self-sufficient and strategically located region white goose of described goose class for happiness food Herba Eichhorniae, the breed quantity of self-sufficient and strategically located region white goose is decided according to the Herba Eichhorniae growing state.

3, according to claim 1 or 2 described purifying eutrophication water body methods, it is characterized in that in eutrophication water, also putting in a suitable place to breed the fish of plankton feeding habit.

4, according to the described purifying eutrophication water body method of claim 3, it is characterized in that described plankton feeding habit fish are silver carp, flathead, tilapia, the breeding density of fish is 100-500 tail/667m ², stocking size is the 50-300g/ tail, does not throw in addition and raises.