{
  "answer_preview": "BOD (Biochemical Oxygen Demand) l\u00e0 l\u01b0\u1ee3ng oxy m\u00e0 vi sinh v\u1eadt c\u1ea7n \u0111\u1ec3 ph\u00e2n h\u1ee7y ch\u1ea5t h\u1eefu c\u01a1 c\u00f3 th\u1ec3 ph\u00e2n h\u1ee7y sinh h\u1ecdc trong n\u01b0\u1edbc th\u1ea3i. Th\u00f4ng s\u1ed1 n\u00e0y gi\u00fap \u01b0\u1edbc t\u00ednh t\u1ea3i h\u1eefu c\u01a1 v\u00e0 quy m\u00f4 x\u1eed l\u00fd sinh h\u1ecdc trong h\u1ec7 th\u1ed1ng x\u1eed l\u00fd n\u01b0\u1edbc th\u1ea3i.\n\nL\u01b0u \u00fd: N\u1ed9i dung k\u1ef9 thu\u1eadt c\u1ea7n \u0111\u01b0\u1ee3c k\u1ef9 s\u01b0 ki\u1ec3m tra tr\u01b0\u1edbc khi d\u00f9ng cho thi\u1ebft k\u1ebf ho\u1eb7c v\u1eadn h\u00e0nh th\u1ef1c t\u1ebf.\n\n\ud83d\udcd6 Tham kh\u1ea3o: Metcalf & Eddy, Ch.2.0.",
  "cache_hit": true,
  "confidence": 0.99,
  "elapsed_ms": 11.1,
  "ok": true,
  "question": "BOD la gi",
  "solver_name": "XLNT Smart Orchestrator staging review",
  "source": "public_answer_cache"
}