1) Minimize versus minimise. Which is UK English & which is US English?
2) After cleaning, all waste must be properly disposed of. Is this sentence acceptable?
Minimize is US. Minimise is UK.
Your second sentence is correct because "dispose of" is considered a verb phrase.
1) To determine which spelling is used in UK English and which is used in US English, you can consult a reliable dictionary or style guide. One commonly used style guide, the Oxford English Dictionary, indicates that "minimize" is the preferred spelling in US English, while "minimise" is the preferred spelling in UK English. However, it's worth noting that there is some variation and overlap in spellings between the two English variants.
2) The sentence "After cleaning, all waste must be properly disposed of" is grammatically correct and acceptable. It effectively conveys the message that after cleaning, proper disposal of waste is necessary. The sentence uses proper subject-verb agreement, clear wording, and follows standard English syntax.