I wonder if expel would be a better meaning for this kanji given that the associated vocabulary all has rather to do with expelling or emitting.
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For comparison, JPDB uses “discharge” for this kanji.
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Good thinking! Personally, I like “exclude” or “exhaust”, though neither are perfect. 
Based on other words that use 排 though, probably “exclude” would be best:
排他（はいた）exclusion/exception
排日（はいにち）anti-Japanese
排斥（はいせき）boycott
排他主義（はいたしゅぎ）exclusionism
And the WaniKani examples you gave are also in the vein of excluding something or other, if you think about it (combustion waste, excess water, etc. – I believe that exhaust of all kinds, including breathing, involve excluding something).
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Hey! I have passed this along to the team for review!! Thanks for bringing this up to us!
-Nick at WK
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Hello,
We’ve made some updates to the meaning for 排 and the associated vocabulary. Details of the changes can be found below:
- 排 (40) - Added “emit” as the primary meaning, added “expel” as the alternative meaning, moved "“reject” and “refuse” to the allow list, added “repudiate” and “exclude” to the allow list, and updated the meaning mnemonic and hint, and updated the reading mnemonic and hint.
- 排水 (40) - Added “drainage water” to the allow list, and updated the meaning explanation.
- 排出 (40) - Updated the meaning explanation.
- 排他 (40) - Updated the meaning explanation.
- 排除 (40) - Updated the meaning explanation.
- 排気 (40) - Added “emission,” “expulsion,” “emit,” “emitting,” “expel,” and “expelling” to the allow list, and updated the meaning explanation. - 排水溝 (45)
- Updated the meaning explanation. Updated the keyword AT for 排 (40).
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