Soedjono Eddy Setiadi, Slamet Agus, Fitriani Nurina, Sumarlan Mega Soekarno, Supriyanto Agus, Mitha Isnadina Dwi Ratri, Othman Norzila Binti
Department of Environmental Engineering, Faculty of Civil, Engineering, and Planning, Institut Teknologi Sepuluh Nopember, Kampus ITS, Sukolilo, Surabaya, 60111, Indonesia.
Department of Biology, Faculty of Science and Technology, Universitas Airlangga, Kampus C UNAIR, Jalan Mulyorejo, Surabaya, 60115, Indonesia.
Heliyon. 2021 Oct 25;7(11):e08268. doi: 10.1016/j.heliyon.2021.e08268. eCollection 2021 Nov.
Coagulation and flocculation using bittern coagulant are effective methods for processing batik industrial wastewater containing heavy metals and high turbidity. Bittern as residual seawater product from salt production can be used as a natural coagulant as it contains magnesium (Mg), chloride (Cl), and sulfate ions (SO ) which can react with Pb and turbidity to produce precipitation. This study focused on Pb and turbidity removal from batik wastewater by introducing different variations of coagulant doses and variations in fast-stirring speed. Bittern coagulant dosage (v/v) of 5%, 15%, 25%, and 35% were used while fast-stirring speed were 55 rpm, 90 rpm, and 125 rpm. Results of this experiment showed that variations of coagulants and stirring speed to give Pb maximum removal of 99.3% happened when coagulant dose and stirring speed at 35% and 55 rpm, while maximum turbidity removal at 97% happened when coagulant dose and stirring speed was 15 % and 125 rpm, respectively. Optimum dose using Response Surface Methodology (RSM) was at coagulant dose of 25% with 55 rpm, of which Pb and turbidity removal were 99% and 93%, respectively.
使用卤水凝结剂进行混凝和絮凝是处理含有重金属和高浊度的蜡染工业废水的有效方法。卤水作为制盐过程中的海水残余产物，可作为天然凝结剂，因为它含有镁（Mg）、氯（Cl）和硫酸根离子（SO ），这些离子可与铅和浊度发生反应产生沉淀。本研究通过引入不同的凝结剂剂量变化和快速搅拌速度变化，着重研究从蜡染废水中去除铅和浊度的情况。使用了5%、15%、25%和35%（体积/体积）的卤水凝结剂剂量，同时快速搅拌速度分别为55转/分钟、90转/分钟和125转/分钟。该实验结果表明，当凝结剂剂量为35%且搅拌速度为55转/分钟时，凝结剂和搅拌速度的变化使铅的最大去除率达到99.3%；而当凝结剂剂量和搅拌速度分别为15%和125转/分钟时，浊度的最大去除率达到97%。使用响应面法（RSM）得出的最佳剂量是凝结剂剂量为25%且搅拌速度为55转/分钟，此时铅和浊度的去除率分别为99%和93%。
