Study on treatment of acidified waste liquid by process of neutralization/oxidation/flocculation

Acidification technology is an effective measure to increase the production of oil and gas wells or stimulate water injection wells. In order to prevent residual acid from damaging and contaminating the hydrocarbon reservoir, the residual acid should be discharged to the ground for centralized treatment after acidizing process. The present experimental work focused on acidified waste liquid composition analysis of the main pollutants so as to study pH adjustment process and optimization of parameters like dose of hydrogen peroxide and polyacrylamide flocculant. The results show that neutralization-oxidation-flocculation disposal technology enables the treated acidified waste liquid to reach the standard of the combined station sewage treatment system. This study provides theoretical basis and guidance for the process of acidified waste liquid re-injection treatment, the design of sewage treatment and spot application.