Linde application of oxygen dissolve project for industrial
abalone farming - Jinjiang Fuda Abalone Fisheries Co., Ltd.
晋江福大鲍鱼水产有限公司 晋江福大鲍鱼水产有限公司是一家以海水养殖为主,集鲍鱼种苗研发、繁育、养殖及销售为一体的大型陆地封闭式工厂化养殖企业。公司育苗和养殖水体达2.3万立方米,产业规模及技术水平处于泉州地区同行前列,是泉州市农业产业化重点龙头企业,也是省级皱纹盘鲍良种场和省水产品质量安全追溯试点企业。
客户需求 受近年来高气温及原水污染的影响,鲍鱼养殖的成活率出现大幅波动,尤其是当鲍鱼种苗长到一厘米左右阶段时死亡率非常高,严重冲击南方地区的鲍鱼养殖业。经厦门大学海洋与环境学院研究试验表明,这一现象主要是鲍鱼养殖水体溶氧量过低造成的,且传统空气曝气无法满足溶氧量要求,当采用纯氧曝气方法使水体溶氧量达到每立升8毫克时即可大幅降低养殖死亡率。据此,客户携手林德,要求采用高效和经济的方法进行纯氧溶氧,并确保达到稳定的每立升8毫克氧含量。
项目难点 纯氧溶氧用于鲍鱼养殖在国内尚属首次,也找不到任何可借鉴的林德现有的或国外参考资料。本项目的难点在于通常的高效、高稳定的养殖纯氧溶氧需要在闭环的循环水体系统中实施。但客户的养殖水系统是开环的非循环水体,这对溶氧的稳定性和经济性带来挑战。本项目分为两个阶段。阶段一为纯氧溶氧鲍鱼养殖小范围试验阶段,用以验证厦门大学提出的理论及观察可行性和经济性,第二阶段在第一阶段成功的基础上实施规模化商业运行。
林德解决方案 在项目第一阶段,林德团队与厦门大学海洋与环境学院密切合作,与客户一起深入讨论并制定了纯氧溶氧应用试验方案和计划,并在客户现场试验池中安装了与林德SOLVOX ® CD 同款的陶瓷纯氧曝气垫及检测、控制装置,选择鲍鱼种苗作为试验养殖对象,经先后近两个月的试养观察,取得了预期的成果。验证了当溶氧量在每立升8毫克时,与对照池相比,鲍鱼的死亡率下降明显,养殖密度提高一倍,鲍鱼生产速度提升20%以上,且具备合理的氧气成本。 鉴于客户对项目第一阶段的结果较为满意,决定实施项目的第二阶段,即扩大范围的纯氧溶氧鲍鱼养殖应用的商业化运行。为此客户与林德于2016年1月份签订了纯氧溶氧技术及液氧供应合同。林德向客户提供一套SOLVOX ®A 150溶氧设备和配套的控制系统以及客易得供氧系统。目前项目的设备采购及安装正在实施过程中。 纯氧溶氧鲍鱼养殖应用在国内尚属首次,而福大鲍鱼养殖公司是福建省最大的鲍鱼养殖基地,本项目的商业运行若顺利的话,将会给我国鲍鱼养殖纯氧溶氧应用起到示范效应。这将对我国鲍鱼养殖业的发展起到积极的促进作用,同时为林德在华南地区获得更多业务机会打下了良好基础。
Jinjiang Fuda Abalone Fisheries Ltd. Jinjiang Fuda Abalone Fisheries Ltd. is a large land base aquaculture enterprise specialized in sea water aquiculture which integrates Research and Development, breeding, aquiculture and sales of abalone seeds. The water volume available for nursery and farming is up to 23,000 m3 and its industrial scale and technical level is playing a leading role compared with its peers in Quanzhou. It is not only a leading agricultural industrialization enterprise in Quanzhou, but also a provincial Haliotis discus hanai breeding farm and provincial pilot enterprise for quality-and-safety traceability of aquatic products.
Customers demands Due to high temperatures and source water pollution in recent years, the survival rate of abalone farming has greatly fluctuated, and the mortality rate is very high especially when abalone seeds grow to about one centimeter long, which seriously impairs the abalone farming industry in southern China. According to the research experiments of Marine and Environmental Institute of Xiamen University, it shows that this phenomenon is mainly caused by low dissolved oxygen in water for abalone farming. The conventional air aeration can’t meet the requirements for oxygen dissolution. When we introduce pure-oxygen aeration method to increase the oxygen dissolved in water to 8 mg per liter, the mortality rate in aquaculture will be significantly reduced. Accordingly, the customer work together with Linde to use the high efficiency economical method to dissolve pure oxygen into water to ensure the oxygen dissolved in water can reach 8 mg per liter steadily.
The challenges It is the first time to apply oxygen dissolve for abalone farming in China , so Linde could hardly find any existing internal or international references. The challenge we have to face in this project is that the conventional high efficiency stable dissolution of pure oxygen is required to be implemented in a closed-loop water system. But customer’s water system is open-loop water, which poses a challenge to the stability and economy of oxygen dissolution. The project consists of two stages. Stage 1 is experimental dissolution of pure oxygen in abalone farming in a small scale to verify the theory put forward by Xiamen University and to observe its feasibility and economy, and the stage 2 is to implement commercial operation in a large scale based on the fruits of the first stage.
Linde solutions In the first stage of the project, Linde team cooperated closely with the team of Xiamen University to have in depth discussions with the customer and developed the application of oxygen dissolve trial program and plan, installed ceramics oxygen aeration pads with control devices in customer’s basin, which is similar as Linde SOLVOX® CD solution, and selected abalone seeds as the subject of trial farming. After nearly two months of raising and observation, the expected results are achieved. It has been proved that when the dissolved oxygen in water reaches to 8 mg per liter, abalone mortality rate was decreased significantly compared with non oxygen dissolving basin. Also the result shown that the breeding density doubled and the abalone production rate increased by more than 20%, and the cost of oxygen is also acceptable. As the customer was satisfied with the results of the first stage of the project, the customer decided to implement the second stage, namely, commercial operation of dissolved oxygen application for abalone farming in a large scale. In January 2016 Linde signed contract with the customer to offer the oxygen dissolving technology with the gas. Under this contract Linde will supply a set of SOLVOX ®A 150 oxygen dissolving equipment with related control systems as well as Keyide oxygen supply system to the customer. The procurement and installation of project equipment is now under way. The application of dissolved oxygen in abalone farming is the first time in China, and Fuda Abalone Fisheries Ltd. is the largest abalone farming base in Fujian Province. If the commercial operation is successful, it will generate a demonstration effect to the application of dissolved pure oxygen in abalone farming throughout China. It will also positively promote the development of abalone farming in China, and lay a good foundation for Linde in seeking more business opportunities in southern China.