NEUTRALIZATION TREATMENT DEVICE AND NEUTRALIZATION TREATMENT METHOD FOR CONSTRUCTION WASTE WATER

To exhibit at least one effect selected from the suppression effect of the consumption of carbon dioxide and the suppression effect of the precipitation of CaCOin neutralization treatment for construction waste water.SOLUTION: The feed amount of carbon dioxide to raw water is adjusted based on the pH value of the raw water obtained from first measurement means 20 by feed means 10 and control means 40. Furthermore, the feed amount of carbon dioxide to the raw water may be adjusted based on the pH value of treatment water obtained from second measurement means 30.SELECTED DRAWING: Figure 1 【課題】工事排水の中和処理において、炭酸ガスの消費量の抑制効果、およびＣａＣＯ３の析出の抑制効果のうち、少なくとも何れかの効果を発揮すること。【解決手段】第１の計測手段２０から得る原水のｐＨ値に基づき、供給手段１０および制御手段４０でもって原水に対する炭酸ガスの供給量を調整する。また、第２の計測手段３０から得る処理水のｐＨ値に基づいて、さらに原水に対する炭酸ガスの供給量を調整してもよい。【選択図】図１