| At present, resource decline is the main problem in fishery especialy in offshore fishery. Intensive fish culture has become the new ecnomic development point steadily in fishery. It is the representation of high-tech in fishery. It is not only development direction of the world, but also the development direction of China.The development of intensive fish culture is late in our country. The study on it is not enough. Facilities and equipments are simple and crude. As for facilities, process flow, product and benefit, there is much difference between our country and the developed country. These years, Liaoning province and Shandong province have builded intensive fish culture plant, but much key technology is not full-blown, now, there are many problems in intensive fish culture, such as: food distributed every day, culture density and the specification of water quality control equipments in different water volumn or culture phases are not based on scientific research, but follow the experience. One way, culture density may be too high, the effect of water quality control is bad; the other way, it can cause the waste of water quality control equipments and energy and increase the culture cost.Based on physiological characters of sea bass (Dicentrarchus labrax) (the rates of oxygen consumption , the rates of nitrogen excretion .etc.) and characters of aquaculture wastewater, this paper design three process flows of water quality control and three softwares, which can optimize the surrounding for fish growth. The softwares are written in Visual Basic 6.0 Professional and operates under Windows 2000, Windows 2003 or WindowsXP, which help users determine the quantity and specification of water quality control equipments, aeration and disinfection facilities. It can help the users make the decision, avoid fund waste or fund lack, make the users get the most profits.This paper designs three process flows of water quality control in intensive fish culture. The first process flow contains offish tank, RBC (nitrification, denitrification, removing BOD) and disinfection. On the basis of the process flow, an RBC aquaculture watwater treatment software was developed.Supposing the area of fish pond is 1000m2 and 0.8m deep, the software can determine total disks aera of RBC in the phase of nitrification, denitrification and removing BOD, the needed ozone product, the needed UV lamp tensity.The second process flow contains of fish tank, microstrainer, BAF, ozone disinfection and activated carbon adsorption. When the users input the data ,the software will output the total area of meshwork of microstrainer, the flux of influent piping, the total aera of BAF, the height of BAF, oxgyen demand of BAF, the needed ozone product, the total aera of activated carbon filter, the needed volumn of activated carbon, replacing time of activated carbon every year, utilize efficiency of activated carbon and so on.The third process flow contains of fish tank, microstrainer, SBR, ozone disinfection and activated carbon adsorption. When the users input the data ,the software will output the total area of meshwork of microstrainer, the aerated time of SBR, inflow time of SBR, cycle time of SBR, the volumn of SBR, oxygen demand of SBR, oxygenation capacity of aeration device, the needed ozone product, the total aera of activated carbon filter, the needed volumn of activated carbon, replacing time of activated carbon every year, utilize efficiency of activated carbon and so on.At the same time, three process flows all can determine the status of fish growth and water quality in fish tank, such as: individual live fish growth, total ammonia excretion, maximum oxygen consumption, the concentration of ammonia in fish tank, food distributed every day, oxygen consumption of sea bass, oxygen demand in fish tanks, aeration velocity of ventilator and so on. In sum, it can help the users make right decisions conveniently during water quality control in intensive fish culture.
|
PDF Full Text Request