The growing mining industry has led to environmental pollution, primarily from mining waste known as acid mine drainage (AMD). To effectively address AMD, a combination of constructed wetland and biochar treatment is necessary. This study aims to assess the ability of biochar in combination with wetland sediment to reduce sulfate and cadmium (Cd) heavy metals in AMD. The research method involved a laboratory-scale constructed wetland in a microcosmos and a treatment of: T1, biochar mixed with wetland sediment; T2, sediment; T3, biochar; and T4, control with no treatment. Observations included sulfate content, pH determination, heavy metal concentration, and scanning electron microscope (SEM) analysis of the biochar. Results after 30 days of observation showed that T1 reduced sulfate concentration by 72.03%, compared to 63.33% for T2, 63.33% for T3, and 2.50% for T4. The reduction in sulfate was accompanied by a consecutive increase in pH, with T1 at pH 6.9, T2 at pH 6.6, T3 at pH 6.4, and T4 at pH 3.6 after 30 days. T1 treatment reduced heavy metal Cd by 80.16% after 30 days, while T2 of 55.46%. T3 of 65.83% and T4 of 2.31%. This indicates that the constructed wetland method, combined with biochar, is more effective in reducing sulfate and the heavy metal Cd in AMD, compared to using only biochar or wetland sediment treatment.

The increasing mining activities have led to the problem of acid mine drainage (AMD) pollution. A method that combines biochar treatment as an adsorbent with wetland sediment treatment as a source of sulfate-reducing bacteria is used to address AMD effectively. This research aimed to determine the ability of biochar in combination with wetland sediment treatment to reduce sulfate and heavy metal content in acid mine drainage wastewater. This research was conducted on a laboratory scale in an AMD wastewater treatment reactor with the following treatments of biochar mixed with wetland sediment. Observations included sulfate content, pH, and heavy metal content. Scanning electron microscope (SEM) analysis was also performed on the biochar. SEM observations revealed the presence of small, dense, and irregularly shaped pores on the surface of the biochar. The results on day 30 showed that biochar mixed with wetland sediment was able to reduce sulfate concentration by 74.19% and reduced Pb by 73.79%, compared with treatment sediment only to 64.81% sulfate concentration and reduced Pb by 53.85%, treatment biochar only had reduced sulfate of 46.90% and reduced Pb by 58.67% and control 1.79% sulfate concentration and reduced Pb by 1.87%.

The presence of various industrial activities is not far from negative impacts such as heavy metal waste. This study examines the ability of R. apiculata and Sonneratia sp. mangroves to translocate and accumulate heavy metals mercury (Hg) and lead (Pb) in the Malili River Estuary, East Luwu...

The Kolaka Regency has significant mining potential; however, mining activities in this area have environmental impacts, particularly on agricultural land in Pesouha Village. This study examined the effects of acid mine drainage on the soil conditions of agricultural land and its influence on nutrient availability of Pesouha Village, Kolaka Regency. The method included direct observation at the agricultural site in Pesouha Village; the selection of sampling stations based on distance from the irrigation contaminated by acid mine drainage, comprising Station 1, Station 2, Station 3, and Station 4 as a control; assessment of soil conditions and characteristics; and soil sampling at each station for nutrient analysis, including organic carbon, total nitrogen, and the availability of phosphorus and potassium. The results indicated that the agricultural soil has a clay texture and has been contaminated by acid mine drainage, as evidenced by the reddish-brown color of the soil at the three stations, except for Station 4, which exhibited a grayish-black color. Furthermore, rice growth was abnormal, characterized by stunted plants and some leaves displaying pale yellow coloration. The levels of carbon, nitrogen, phosphorus, and potassium were all relatively low at Stations 1, 2, and 3, as well as at Station 4, except for organic carbon, which was optimal at Station 4, following the standards set by the National Standardization Agency (BSN) at the Ministry of Agriculture.

Sorghum stem (Sorghum bicolor L.) is a plant that has not been maximally utilized. But sorghum stems contain high cellulose. The hydroxyl (OH-) and carboxyl (-COOH) groups on cellulose can bind heavy metals; therefore, sorghum stems have the opportunity to be used as an adsorbent to absorb heavy...