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Intangible Assets, Net
 9 Months Ended
Sep. 30, 2023
Intangible Assets, net [Abstract]  
Intangible Assets, net

10. Intangible Assets, net

 

Intangible assets as of December 31, 2022 and September 30, 2023 consisted of the followings:

 

   December 31,
2022		   September 30,
2023		 
Computer software at cost  $104,211   $136,305 
Sewage discharge permit*   1,762,129    1,673,386 
    1,866,340    1,809,691 
Accumulated amortization   (557,282)   (873,629)
   $1,309,058   $936,062 

 

Amortization expenses were $121,035 and $133,450 for the three months ended September 30, 2022 and 2023, respectively.

  

Amortization expenses were $397,114 and $374,110 for the nine months ended September 30, 2022 and 2023, respectively.

  

Total future amortization expenses for finite-lived intangible assets as of September 30, 2023 were estimated as follows:

 

Remainder of 2023  $115,587 
2024   460,325 
2025   308,341 
2026   9,472 
2027   8,034 
Thereafter   34,303 
Total  $936,062