Odor Reduction of Pig Wastewater Using Magnesia (in-situ test)

Journal of the Korean Chemical Society

article

Su Ho Bae¹  Keon Sang Ryoo² 

[1] Department of Civil Engineering, Andong National University;Department of Applied Chemistry, Andong National University

关键词: Pig wastewater;    Odor;    Magnesia;    Ammonia;    Hydrogen sulfide;   

DOI  :  10.5012/jkcs.2022.66.3.202

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

In this study, we tried to obtain the optimal conditions to reduce odors generated from pig wastewater usingmagnesia (MgO) through in-situ test after producing a reactor for removing odors. For this purpose, the filling amount of magnesia, the injection amount of pig wastewater, the aeration method, the aeration amount and the aeration time were considered. The field experiment was conducted at Cheongwoon Livestock Farm, which has a pig wastewater reservoir. As theamount of magnesia added to the weight of wastewater (500 kg) increases, the amount of ammonia (NH3) and hydrogen sulfide (H2S) generated tended to gradually decrease. As a result of the test, ammonia and hydrogen sulfide in the pig wastewater decreased up to 65% and 77%, respectively, for 2 days aeration after 0.8% of magnesia was added to the reaction tank. Theinitial pH of the pig wastewater in the reactor was 8.2, and the pH was found to be 9.2 when magnesia was added up to 0.8%.In the light of this trend, it can be known that magnesia gradually increases the pH in the pig wastewater and makes it weaklyalkaline. As the pH increases, part of the ammonia gas present in the pig wastewater vaporizes into the air and the remainingpart is removed by precipitation after chemical bonding with dissolved magnesium ions and phosphate ions. In order toremove the odor of pig wastewater and turn it into compost, most of the existing livestock farms go through a six-month aeration process using microorganisms. In contrast, the current study proved the effect of removing odors from pig wastewaterwithin 2 days through chemical reactions that do not affect microbial activity.

【 授权许可】

Unknown