With the increasing concern of water resources in the society, the seawater desalination technology in China is gradually becoming mature, and some new industries have been derived from this. From the beginning of this year, a new concept, "Asian seawater desalination," has quietly entered people's attention.
"The cost per ton of desalinated seawater is currently around 5 yuan, while the cost per ton for subtropical seawater desalination is only around 2 yuan. After large-scale production, along with the loss of pipelines, management fees, etc., it is basically similar to the current price of tap water. The desalinated sub-seawater indicators are consistent with and better than tap water and drinking water standards and can be directly consumed.†Tan Yongwen, deputy director of the Hangzhou Water Treatment Technology Development Center of the State Oceanic Administration, gave an interview with reporters on the cost advantages of seawater desalination in Asia. Fully affirmed.
Water quality difference determines cost difference
The most striking thing about Asian seawater desalination is undoubtedly its low cost. So, what is submarine water? Why is its processing cost so low? I believe this is what many people want to know.
In fact, sub-alkaline water is water between seawater and freshwater, and it usually refers to water close to seawater such as rivers and sea inlets. The biggest difference between the quality of seawater and seawater is the salinity: the salinity of seawater is generally above 30,000 mg/l, and that of seawater is below 30000 mg/l. The low salinity determines that the desalination of sub-seawater is relatively simple in the treatment process, and the equipment requirements such as the performance of the membrane module are relatively low, and therefore its processing cost is also low.
The difference in water quality determines the difference in the cost of the two treatments. Just take a look at the two key indicators of water and electricity consumption and recovery rate, this difference can be seen at a glance: seawater desalination power consumption of up to 3.5 kWh ~ 4 kWh, while the subtropical desalination of tons of water power consumption is only 1 .5 kWh is still less than half. It is worth mentioning that, in the composition of seawater desalination operating costs, the electricity tariff accounts for about 40% of the proportion; on the other hand, from the perspective of recovery rate, the current seawater desalination can achieve a recovery rate of 35% to 40%. Seawater desalination in Asia can be as high as 75%, which is twice the desalination of seawater. In other words, the amount of water obtained by processing one ton of seawater can be obtained by processing two tons of seawater.
Asian desalination technology comes alive
As we all know, China is a country where freshwater resources are not abundant. At present, according to statistics, there are more than 400 cities in China lacking water and 110 cities are seriously deprived of water. The annual direct economic losses caused by this situation amount to several hundred billion yuan. With the rapid development of the industrial economy, the phenomenon of water scarcity is spreading. Even Zhejiang, known as the "Jiangnan Water Town," suffered unprecedented water shortages in these two years. Among the 70 cities and counties in the province, There have already been 36 severe water shortages and 21 dynamic water shortages.
When people finally realized that the water of this inseparable daily life would one day be exhausted, they locked their eyes on desalination. China established the first seawater desalination research institute in Hangzhou in 1968 (the predecessor of the Hangzhou Water Treatment Center), and it has been more than half a century now. In the past 20 years, China’s seawater desalination research has made the fastest progress, and the tonnage cost has been reduced. The original 20 yuan gradually dropped to about 5 yuan today. It is based on the progress of seawater desalination technology that the Asian seawater desalination technology has been able to develop to the current level in a few short years. The price advantage, in turn, makes subtropical water desalinated in specific regions, and is more willing to be accepted by companies and residents than seawater desalination.
What is pleasing is that China has extremely rich water resources in the Asian Sea, among which Zhejiang Province is the most. According to statistics, Zhejiang’s total sea water capacity has reached 200 million cubic meters. We calculate: 200 million cubic meters of water can be used for 3 million people a year if calculated according to 75% recovery rate and per capita domestic water consumption of 274 liters/day. If you add up the total capacity of the subtropical seawater from the estuaries of the Yangtze River into the sea, the Yellow Sea into the sea, and the Pearl River estuary, how impressive the numbers will be!
Wide range of market applications
After seawater passes through different desalination processes, it can be applied to drinking water, industrial water, medical water, etc., respectively. At the same time, this technology can also be used for the treatment of back-fed saline water, underground brackish water and other water sources. The market prospect of Asian seawater desalination technology is generally optimistic in the industry. In Zhejiang, the project was listed as a key scientific and technological project of the Provincial Department of Science and Technology, and in November 2004, a subtropical desalination technology experimental station was established at the Yuhuan Purification Group. At present, the project has passed acceptance, and the inspection results of authoritative departments show that the seawater after purification and desalination meets the national drinking water hygiene standards, thus providing a scientific basis for the large-scale "subtropical desalination" treatment. Yuhuan County is currently building a subtropical desalination plant in the Xuanmen Second Phase Reservoir Area.
Compared with the high cost of seawater desalination, the desalination of seawater in Asia is fully qualified for large-scale deployment. Not long ago, the Hangzhou Water Treatment Center signed a contract for a 100,000-tonne per day membrane desalination project in the sea with a large-scale paper company in Guangdong. This is the largest submarine desalination project with single capacity in China, marking the industry. A substantial step has been taken toward large-scale development.
"The cost per ton of desalinated seawater is currently around 5 yuan, while the cost per ton for subtropical seawater desalination is only around 2 yuan. After large-scale production, along with the loss of pipelines, management fees, etc., it is basically similar to the current price of tap water. The desalinated sub-seawater indicators are consistent with and better than tap water and drinking water standards and can be directly consumed.†Tan Yongwen, deputy director of the Hangzhou Water Treatment Technology Development Center of the State Oceanic Administration, gave an interview with reporters on the cost advantages of seawater desalination in Asia. Fully affirmed.
Water quality difference determines cost difference
The most striking thing about Asian seawater desalination is undoubtedly its low cost. So, what is submarine water? Why is its processing cost so low? I believe this is what many people want to know.
In fact, sub-alkaline water is water between seawater and freshwater, and it usually refers to water close to seawater such as rivers and sea inlets. The biggest difference between the quality of seawater and seawater is the salinity: the salinity of seawater is generally above 30,000 mg/l, and that of seawater is below 30000 mg/l. The low salinity determines that the desalination of sub-seawater is relatively simple in the treatment process, and the equipment requirements such as the performance of the membrane module are relatively low, and therefore its processing cost is also low.
The difference in water quality determines the difference in the cost of the two treatments. Just take a look at the two key indicators of water and electricity consumption and recovery rate, this difference can be seen at a glance: seawater desalination power consumption of up to 3.5 kWh ~ 4 kWh, while the subtropical desalination of tons of water power consumption is only 1 .5 kWh is still less than half. It is worth mentioning that, in the composition of seawater desalination operating costs, the electricity tariff accounts for about 40% of the proportion; on the other hand, from the perspective of recovery rate, the current seawater desalination can achieve a recovery rate of 35% to 40%. Seawater desalination in Asia can be as high as 75%, which is twice the desalination of seawater. In other words, the amount of water obtained by processing one ton of seawater can be obtained by processing two tons of seawater.
Asian desalination technology comes alive
As we all know, China is a country where freshwater resources are not abundant. At present, according to statistics, there are more than 400 cities in China lacking water and 110 cities are seriously deprived of water. The annual direct economic losses caused by this situation amount to several hundred billion yuan. With the rapid development of the industrial economy, the phenomenon of water scarcity is spreading. Even Zhejiang, known as the "Jiangnan Water Town," suffered unprecedented water shortages in these two years. Among the 70 cities and counties in the province, There have already been 36 severe water shortages and 21 dynamic water shortages.
When people finally realized that the water of this inseparable daily life would one day be exhausted, they locked their eyes on desalination. China established the first seawater desalination research institute in Hangzhou in 1968 (the predecessor of the Hangzhou Water Treatment Center), and it has been more than half a century now. In the past 20 years, China’s seawater desalination research has made the fastest progress, and the tonnage cost has been reduced. The original 20 yuan gradually dropped to about 5 yuan today. It is based on the progress of seawater desalination technology that the Asian seawater desalination technology has been able to develop to the current level in a few short years. The price advantage, in turn, makes subtropical water desalinated in specific regions, and is more willing to be accepted by companies and residents than seawater desalination.
What is pleasing is that China has extremely rich water resources in the Asian Sea, among which Zhejiang Province is the most. According to statistics, Zhejiang’s total sea water capacity has reached 200 million cubic meters. We calculate: 200 million cubic meters of water can be used for 3 million people a year if calculated according to 75% recovery rate and per capita domestic water consumption of 274 liters/day. If you add up the total capacity of the subtropical seawater from the estuaries of the Yangtze River into the sea, the Yellow Sea into the sea, and the Pearl River estuary, how impressive the numbers will be!
Wide range of market applications
After seawater passes through different desalination processes, it can be applied to drinking water, industrial water, medical water, etc., respectively. At the same time, this technology can also be used for the treatment of back-fed saline water, underground brackish water and other water sources. The market prospect of Asian seawater desalination technology is generally optimistic in the industry. In Zhejiang, the project was listed as a key scientific and technological project of the Provincial Department of Science and Technology, and in November 2004, a subtropical desalination technology experimental station was established at the Yuhuan Purification Group. At present, the project has passed acceptance, and the inspection results of authoritative departments show that the seawater after purification and desalination meets the national drinking water hygiene standards, thus providing a scientific basis for the large-scale "subtropical desalination" treatment. Yuhuan County is currently building a subtropical desalination plant in the Xuanmen Second Phase Reservoir Area.
Compared with the high cost of seawater desalination, the desalination of seawater in Asia is fully qualified for large-scale deployment. Not long ago, the Hangzhou Water Treatment Center signed a contract for a 100,000-tonne per day membrane desalination project in the sea with a large-scale paper company in Guangdong. This is the largest submarine desalination project with single capacity in China, marking the industry. A substantial step has been taken toward large-scale development.
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