Please capitalize where necessary: dust collector: aqua-filter with a capacity of 16 liters
A: Dust collector: aqua-filter with a capacity of 16 liters

Please capitalize where necessary: if you know the name of wrong dll like dvdplay.exe, choose free download--saving money.
A: If you know the name of wrong DLL like dvdplay.exe, choose Free download--saving money.

Please capitalize where necessary: he received a knighthood in 1669 and was appointed to high office as surveyor-general of the ordnance.
A: He received a knighthood in 1669 and was appointed to high office as Surveyor-General of the Ordnance.

Please capitalize where necessary: the aim is to prevent lots containing unacceptable numbers of defective units from passing into the manufacturing system.
A:
The aim is to prevent lots containing unacceptable numbers of defective units from passing into the manufacturing system.