Micro-pore Ceramic Filter and UV System as Ballast Water Treatment: Preliminary Study on Chlorella Removal and Bacteria Inactivation

2008 ◽  
Vol 11 (1) ◽  
Author(s):  
Manxia Zhang ◽  
Ningwei Xu ◽  
Chang li Li ◽  
Yatong Wang ◽  
Yimin Zhu
Keyword(s):  
Water Treatment ◽  
Uv Radiation ◽  
Ballast Water ◽  
Ceramic Filter ◽  
Flow Rates ◽  
Bacteria Inactivation ◽  
Combination System ◽  
Ballast Water Treatment ◽  
Preliminary Study ◽  
Ceramic Filtration

AbstractA combination system of micro-pore ceramic filtration and UV radiation was built up for ballast water treatment. Two treatment methods, single micro-pore ceramic filtration and micro-pore filtration and UV radiation, were studied in the research, respectively. Chlorella removal rates and total oceanic bacteria inactivation rates were measured at different flow rates (0.6 ~ 4.7 m

Application of Porous Ceramic Filtration on Ballast Water Treatment

2012 ◽  
Vol 610-613 ◽  
pp. 1505-1508 ◽  
Author(s):  
Man Xia Zhang ◽  
Xiao Jia Tang ◽  
Yi Min Zhu
Keyword(s):  
Water Treatment ◽  
Ballast Water ◽  
Porous Ceramic ◽  
Marine Ecosystem ◽  
Ceramic Filter ◽  
Human Beings ◽  
Flow Rates ◽  
Ballast Water Treatment ◽  
Wall Flow ◽  
Ceramic Filtration

Ballast water has been detected to be a great threat to marine ecosystem and human beings for threatens from biological invasion. Filtration is a kind of optimising primary method in ballast water treatment. However, so far no suitable filter has been applied considering effectiveness, economy, and resistance. A novel wall-flow structure porous ceramic filter (PCF) was adopted to combine with UV radiation. To evaluate the PCF, three types of indicator algae were filtered at different flow rates and initial alga densities. The results showed that up to 100% removal effciencies can be obtained on alga greater than 10µm and less than 50µm at the pointed alga density. The mechanism behind high removal efficiencies and high velocity were revealed as well.

Underwater Spatial Distribution of UVC Radiant Intensity in Different Water Environment for Ballast Water Treatment

2013 ◽  
Vol 448-453 ◽  
pp. 630-633
Author(s):  
Man Xia Zhang ◽  
Ya Long Liu ◽  
Cheng Yu Yuan ◽  
Yi Min Zhu
Keyword(s):  
Spatial Distribution ◽  
Water Treatment ◽  
Uv Radiation ◽  
Ballast Water ◽  
Tap Water ◽  
Water Environment ◽  
Radiant Intensity ◽  
Bacteria Inactivation ◽  
Ballast Water Treatment ◽  
Influence Of Water

UV radiation, as an effective method for bacteria inactivation, has been applied popularly on ballast water treatment. However, the inactivation efficiencies of UV radiation greatly depend on the UV intensity which distributed unevenly in water and can be deeply affected by the suspending particles in water. For better understanding of the spatial distribution of UV radiation, a 16W UVC lamp was measured underwater to detect the radiant intensity over horizontal and vertical distance. The distribution tendency of UV radiant intensity was probed behind large amounts of experimental data. In addition, four types of different water including tap water, clean seawater, seawater mixed with suspending substances (SS), and seawater mixed with typical algae, were studied to identity the influence of water environment on UV transmission. The impacting significances were compared among different water quality, to optimize the ballast water treatment methods combining with UV radiation.

Material Study for Porous Ceramic Filtration Applied on Ballast Water Treatment

2013 ◽  
Vol 721 ◽  
pp. 229-232
Author(s):  
Man Xia Zhang ◽  
Qing Xue ◽  
Xiao Jia Tang ◽  
Yi Min Zhu
Keyword(s):  
Water Treatment ◽  
Ballast Water ◽  
Evaluation System ◽  
Material Selection ◽  
Porous Ceramic ◽  
Combination Method ◽  
Oxide Ceramic ◽  
Filter Performance ◽  
Ballast Water Treatment ◽  
Ceramic Filtration

For urgent requirement of onboard ballast water treatment, a combination method of wall-flow structure porous ceramic filtration (PCF) and UV radiation has been prompted and studied systematically in the lab. The paper mainly forcuses on the material selection for PCF in order to obtain a more effective, operational, durable and economic treatment. Hence four types of ceramic materials were compared, and a series of experiments were arranged to test alga removal efficiency, durability and differential pressure of the filters. A fuzzy comprehensive evaluation system was set up to assess filter performance from five aspects. The normalization results show that oxide ceramic wins carbide ceramic at three major fators: resistance, durability and cost.

scholarly journals Application of Hydrocyclone and UV Radiation as a Ballast Water Treatment Method

1970 ◽  
Vol 22 (3) ◽  
pp. 183-191 ◽  
Author(s):  
Željko Kurtela ◽  
Pavao Komadina
Keyword(s):  
Water Treatment ◽  
Uv Radiation ◽  
Ballast Water ◽  
Pilot Plant ◽  
Treatment Method ◽  
Hydrodynamic Forces ◽  
Treatment Methods ◽  
Ballast Water Treatment ◽  
International Regulations ◽  
Scientific Opinion

The ballast water exchange methods in open sea are, for the time being, the prevailing procedures accepted by shipowners. However, such methods do not guarantee full efficacy in elimination of allochthonous organisms. Besides, in some navigation zones, in particular in the closed seas, not even the criteria prescribed by international regulations can be fulfilled, i.e. the position of a ship exchanging ballast must be farther than 200Nm from the shore (alternatively 50Nm) at the sea depth exceeding 200m. Numerous research attempts on various treatment methods lead to the conclusion that there is still no scientific opinion on the final choice of methods for wide application on board. The treatment methods, such as hydrocyclone separation in the first stage and UV radiation in the second stage, stand a good chance for application on board. Advantages of such a combined method are in the very application of treatment that can be performed during all stages of ballast water treatment, i.e. loading ballast, voyage in ballast and discharging ballast. In closed seas and on shorter routes the operational advantages of hydrocyclone and UV radiation could be the prevailing factor for application. Within the research on the possible application of ballast water treatment by hydrocyclone and UV radiation, a pilot plant with hydrocyclone cluster and UV device was constructed. The research carried out on the pilot plant installed on board the m/v ‘’Naše more’’ proved the effectiveness of such ballast water treatment method and offered a new approach in using hydrocyclone for the inactivation of organisms by hydrodynamic forces. This approach has largely increased the efficacy of the device and a new method for utilization of hydrocyclone in ballast water treatment on board has been discovered. KEY WORDS: ballast water treatment, hydrocyclone, UV radiation, application of method, pilot plant, hydrodynamic forces

Prediction for Algae Removal Efficiencies of Porous Ceramic Filter on Ballast Water Treatment

2013 ◽  
Vol 448-453 ◽  
pp. 425-428
Author(s):  
Man Xia Zhang ◽  
Yan Ma ◽  
Cheng Yu Yuan ◽  
Yi Min Zhu
Keyword(s):  
Water Treatment ◽  
Ballast Water ◽  
Uv Light ◽  
Porous Ceramic ◽  
Ceramic Filter ◽  
Operational Conditions ◽  
Filter Performance ◽  
Algae Removal ◽  
Ballast Water Treatment ◽  
Removal Efficiencies

In light of urgent requirement of onboard ballast water treatment, this paper presents a laboratory study of an application of a novel wall-flow structure porous ceramic filter (PCF), with employment of UV light. It has been found that, for onboard treatment, the operational conditions may significantly affect the filter performance. To obtain optimal operational conditions and high filtration efficiencies on plankton, PCF was studied systematically though computational prediction and mathematical analysis. According to the strict criteria of International Maritime Organization (IMO) on ballast water treatment, high density of indicator algae were mixed into simulated ballast water as processing targets, and nearly 100% removal efficiencies are expected. Flow rate, algal density and algal size were chosen as three key operational conditions, was investigated on a 6L PCF. Response surface methodology (RSM) was used to evaluate the significance of the three factors on the response values of algae removal efficiencies.

Sign in / Sign up

Export Citation Format

Share Document