XML 56 R40.htm IDEA: XBRL DOCUMENT v3.25.2
Nature of business and organization (Details)
 12 Months Ended
Dec. 31, 2024
C Q B V I [Member]  
Place of incorporation A British Virgin Islands company
Incorporation date Incorporated on December 14, 2015
Principal activites A holding company
Ownership 100% owned by CDT Cayman
C D T B V I [Member]  
Place of incorporation A British Virgin Islands company
Incorporation date Incorporated on June 26, 2015
Principal activites A holding company
Ownership 100% owned by CDT Cayman
Ultra H K [Member]  
Place of incorporation A Hong Kong company
Incorporation date Incorporated on February 27, 2015
Principal activites A holding company
Ownership 100% owned by CQ BVI
C D T H K [Member]  
Place of incorporation A Hong Kong company
Incorporation date Incorporated on July 30, 2015
Principal activites A holding company
Ownership 100% owned by CDT BVI
Shenzhen C D T [Member]  
Incorporation date Incorporated on August 27, 2012
Principal activites Developing, producing, selling and installing sewage treatment systems and providing sewage treatment services
Ownership 100% collectively owned by Ultra HK (15%) and CDT HK (85%)
Nature of company A PRC limited liability company
Registered capital Registered capital of RMB 60,000,000
B J C D T [Member]  
Incorporation date Incorporated on April 25, 2016
Principal activites Providing sewage treatment services
Ownership 100% owned by Shenzhen CDT
Nature of company A PRC limited liability company
Registered capital Registered capital of RMB 20,000,000
F J L S Y [Member]  
Incorporation date Incorporated on March 13, 2015
Principal activites Providing sewage treatment services
Ownership 51% owned by Shenzhen CDT
Nature of company A PRC limited liability company
Registered capital Registered capital of RMB 5,000,000
T J C D T [Member]  
Incorporation date Incorporated on October 22, 2014
Principal activites Providing sewage treatment services
Ownership 100% owned by Shenzhen CDT
Nature of company A PRC limited liability company
Registered capital Registered capital of RMB 10,000,000
C D C D T [Member]  
Incorporation date Incorporated on March 26, 2015
Principal activites Providing sewage treatment services
Ownership 51% owned by Shenzhen CDT
Nature of company A PRC limited liability company
Registered capital Registered capital of RMB 5,000,000
B J C X C D T [Member]  
Incorporation date Incorporated on September 7, 2016
Principal activites Providing sewage treatment services
Ownership 51% owned by Shenzhen CDT
Nature of company A PRC limited liability company
Registered capital Registered capital of RMB 5,000,000
B D C D T [Member]  
Incorporation date Incorporated on October 21, 2015
Principal activites Providing sewage treatment services
Ownership 51% owned by Shenzhen CDT
Nature of company A PRC limited liability company
Registered capital Registered capital of RMB 5,000,000
H S C D T [Member]  
Incorporation date Incorporated on May 18, 2015
Principal activites Providing sewage treatment services
Ownership 51% owned by Shenzhen CDT
Nature of company A PRC limited liability company
Registered capital Registered capital of RMB 3,000,000
G X C D T [Member]  
Incorporation date Incorporated on January 29, 2016 [1]
Principal activites Providing sewage treatment services [1]
Ownership 51% owned by Shenzhen CDT [1]
Nature of company A PRC limited liability company [1]
Registered capital Registered capital of RMB 5,000,000 [1]
H Z C D T [Member]  
Incorporation date Incorporated on February 6, 2015
Principal activites Providing sewage treatment services
Ownership 51% owned by Shenzhen CDT
Nature of company A PRC limited liability company
Registered capital Registered capital of RMB 5,000,000
H H H T C D T [Member]  
Incorporation date Incorporated on February 11, 2015
Principal activites Providing sewage treatment services
Ownership 51% owned by Shenzhen CDT
Nature of company A PRC limited liability company
Registered capital Registered capital of RMB 5,000,000
T Y C D T [Member]  
Incorporation date Incorporated on March 23, 2015 [2]
Principal activites Providing sewage treatment services [2]
Ownership 51% owned by Shenzhen CDT
Nature of company A PRC limited liability company [2]
Registered capital Registered capital of RMB 5,000,000 [2]
X M Y D T [Member]  
Incorporation date Incorporated on April 9, 2015 [3]
Principal activites Providing sewage treatment services [3]
Ownership 51% owned by Shenzhen CDT [3]
Nature of company A PRC limited liability company [3]
Registered capital Registered capital of RMB 5,000,000 [3]
[1] In March 2024, the Company disposed of its entire 51% ownership in GX CDT and transferred its ownership to Chun’E Zhao, the legal representative of GX CDT for consideration of RMB 500. The disposal of GX CDT did not have a material impact on the Company’s consolidated financial statements. 
[2] In June 2024, the Company disposed of its entire 51% ownership in TY CDT and transferred its ownership to a third party for consideration of RMB 1,000. The disposal of TY CDT did not have a material impact on the Company’s consolidated financial statements. 
[3] In January 2022, the Company disposed of its entire 51% ownership in XM YDT and transferred its ownership to a third party for consideration of approximately $5,000. The disposal of XM YDT did not have a material impact on the Company’s consolidated financial statements.