Water Treatment Facilities Research Articles

Delphi/AHP를 활용한 화력발전플랜트 고위험시설 선정 연구

Thermal power plants are large-scale plants made up of various types of buildings and equipment to produce electricity and consist of coal handling systems, oil storage facilities, boiler facilities, turbine/generator facilities, substation facilities, water treatment facilities, and auxiliary facilities for operating them. For these special fire-fighting objects, high safety is required in consideration of fire load and fire risk. In principle, the selection of fire fighting facilities applied to each space is primarily in accordance with relevant laws and regulations, and is installed and maintained by the power plant operating institution. However, most power plant operating institutions do not secure safety according to the characteristics of each major dangerous space and maintain fire fighting facilities under the same conditions, which is insufficient to secure actual fire safety. In this study, Delphi and AHP were used to assign weights according to the importance of dangerous spaces, and major dangerous spaces according to priorities were divided into fire/explosion risk facilities and leak/explosion risk facilities.

A Study on the Challenges and Legal Issues arising from Chinese investment in Bangladesh Natural Resources and Infrastructure

This study focuses on the challenges and legal issues surrounding Chinese investment in Bangladesh's natural resources and infrastructure. It looks at the impact of Chinese investment on the country's resources and infrastructure, including any legal and regulatory issues that may arise. The study may examine how Bangladesh's laws and regulations protect the country's natural resources and infrastructure from foreign investment, and whether these laws are adequate to ensure that the country's resources are being used sustainable and in a manner that benefits the local communities. Additionally, the study may look at the role of international law and international organizations in mediating disputes between Bangladesh and Chinese investors. I have mentioned foreign investments in natural resources of Bangladesh e.g. natural gas, petroleum oil, coal and water resources. Until now, China only invests in a couple of sectors relating to natural resources. These investments are infrastructure projects e.g. power generation, construction, port establishment, agro-processed product, electrical and electronics, light engineering, roads, railways, power plants, and water treatment facilities, etc. This is a second generation Chinese BIT that incorporated general Characteristics of BITs of that era. Under this BIT, Regarding the dispute of expropriation, an ad hoc arbitral tribunal can be formed which would determine its own procedure, but the first negotiation shall take place between the parties to solve the dispute. Under these agreements, the disputes shall be settled by applying generally recognized principles of international law accepted by the parties.

Substantiation of the technology of treatment of flushing water of water treatment facilities with subsequent return to the technological cycle

The paper lists the existing technological schemes for the purification of flushing water of water treatment facilities; shows the results of a multifactorial central composite planning experiment with the obtained second-order correlation and regression analysis equations describing the dependence of the residual content of suspended solids on the initial content, sedimentation duration, coagulant dose when using various reagents; the recommended technological scheme for the purification of flushing water with technological calculation of the main structure.

Optimizing Height Above Nearest Drainage parameters to enable rapid flood mapping in North Carolina

Surface water flooding represents a significant hazard for many infrastructure systems. For example, residential, commercial, and industrial properties, water and wastewater treatment facilities, private drinking water wells, stormwater systems, or transportation networks are often impacted (i.e., in terms of damage or functionality) by flooding events. For large scale events, knowing where to prioritize recovery resources can be challenging. To help communities throughout North Carolina manage flood disaster responses, near real-time state-wide rapid flood mapping methods are needed. In this study, Height Above Nearest Drainage (HAND) concepts are combined with National Water Model river discharges to enable rapid flood mapping throughout North Carolina. The modeling system is calibrated using USGS stage-discharge relationships and FEMA 100-year flood maps. The calibration process ultimately provides spatially distributed channel roughness values to best match the available datasets. Results show that the flood mapping system, when calibrated, provides reasonable estimates of both river stage (or corresponding water surface elevations) and surface water extents. Comparing HAND to FEMA hazard maps both in Wake County and state-wide shows an agreement of 80.1% and 76.3%, respectively. For the non-agreement locations, flood extents tend to be overestimated as compared to underestimated, which is preferred in the context of identifying potentially impacted infrastructure systems. Future research will focus on developing transfer relationships to estimate channel roughness values for locations that lack the data needed for calibration.

Biodegradation of (Aminomethyl)phosphonic acid (AMPA) by isolated microbial consortia extracted from biological filters at drinking water treatment plants

The widespread use of glyphosate has significantly increased its presence in drinking water sources. Aminomethylphosphonic Acid (AMPA), a breakdown product of glyphosate, is challenging to remove from water using conventional treatment methods, posing risks to public health and environmental safety. This work investigates the biodegradation of AMPA by bacteria isolated from three environmental sources, with a focus on determining their potential application in water treatment systems. Two samples were collected from granular activated carbon (GAC) filters of different operational durations at a water treatment facility, and one sample was taken from soil that had historically been treated with glyphosate-based herbicides. Bacterial isolates capable of degrading AMPA were identified from these samples through selective enrichment, and kinetic degradation experiments were then conducted to assess their effectiveness. In environmental samples, after 48 hrs AMPA removal was > 70 % using GAC from an active treatment plant and soil samples removed 19 %. After bacterial isolation a consortium was isolated and from these four isolates were identified, comprising three species, including novel AMPA degraders M−S3 and M−SS (Myroides sp. mNGS23), and P-S92 (Pseudochrobactrum saccharolyticum). Within both minimal media supplemented with AMPA and raw untreated showing substrate concentrations above 10 mg/L whilst the specific degradation rates saw a decrease in substrate concentrations above 100 mg/L. AMPA removal occured in pilot scale sand filters augmented with P-S92 but removal was inconsistent. These findings show the potential of using biodegradation as an effective treatment strategy for AMPA removal from water. The identification of AMPA-degrading bacteria offers a promising solution for enhancing the removal of this persistent pollutant from contaminated waters. Further research is recommended to explore the full-scale application of these isolates in water treatment processes. This study contributes to the development of sustainable water treatment technologies by harnessing the natural degradative capacities of environmental bacteria.

Implementation of User-Oriented Geovisualization Web Dashboard for Monitoring Access to Improved Water using Satellite Imageries Data

This study aims to develop an engaging, web-based visualization dashboard for improved water access in Indonesia. The dashboard map was made using three technologies: the Qgis2web Python plugin for producing two-dimensional (2D) dashboard maps, JavaScript leaflets for map visualization, and Hypertext Markup Language (HTML), Cascade Stylesheet (CSS), and JavaScript for the user interface. The built-in map dashboard has several features, including grid click, legend, zoom, search, and measure distance, which are meant to help users determine the location of the nearest water treatment facilities, identify geographical features, and keep track of areas that have poor access to improved water. Evaluation using the system usability scale (SUS) concludes the dashboard is acceptable with an excellent rating. Our results reiterate and enhance support for government institution and relevant stakeholders in providing sustainable access to public water.

Determination of Optimal Water Intake Layer Using Deep Learning-Based Water Quality Monitoring and Prediction

The effective management of drinking water sources is essential not only for maintaining their water quality but also for the efficient operation of drinking water treatment plants. A decline in water quality in water reservoirs can result in increased operational costs for water treatment and compromise the reliability and safety of treated water. In this study, a deep learning model, the long short-term memory (LSTM) algorithm, was employed to predict water quality and identify an optimal water intake layer across various seasons and years for Juam Lake, Korea. A comprehensive investigation was conducted to prioritize various water quality parameters and determine suitable intake layers. Based on these priorities, effective methods for optimizing an intake layer were developed to enable more reliable water intake operations. Water quality data from January 2013 to June 2023 were analyzed for the study. This dataset was used for rigorous statistical and correlational analyses to better understand the dynamics affecting water quality parameters. The findings aim to enhance the operational efficiency of water intake and treatment facilities.

Establishment and inactivation of mono-species biofilm in a semipilot-scale water distribution system using nanocomposite of silver nanoparticles/montmorillonite loaded cationic chitosan

This study presents a novel approach in the synthesis and characterization of nanocomposites comprising cationic chitosan (CCS) blended with varying concentrations of silver nanoparticles/montmorillonite (AgNPs/MMT). AgNPs/MMT was synthesized using soluble starch as a reducing and stabilizing agent. Subsequently, nanocomposites, namely CCS/AgMMT-0, CCS/AgMMT-0.5, CCS/AgMMT-1.5, and CCS/AgMMT-2.5, were developed by blending 2.5 g of CCS with 0, 0.5, 1.5, and 2.5 g of AgNPs/MMT, respectively, and the corresponding nanocomposites were prepared using ball milling technique. Transmission electron microscopy (TEM) analysis revealed the formation of nanocomposites that exhibiting nearly spherical morphologies. Dynamic light scattering (DLS) measurements displayed average particle sizes of 1183 nm, 131 nm, 140 nm, and 188 nm for CCS/AgMMT-0, CCS/AgMMT-0.5, CCS/AgMMT-1.5, and CCS/AgMMT-2.5, respectively. The narrow polydispersity index (~0.5) indicated uniform particle size distributions across the nanocomposites, affirming monodispersity. Moreover, the zeta potential values exceeding 30 mV across all nanocomposites that confirmed their stability against agglomeration. Notably, CCS/AgMMT-2.5 nanocomposite exhibited potent antibacterial and antibiofilm properties against diverse pipeline materials. Findings showed that after 15 days of incubation, the highest populations of biofilm cells, Pseudomonas aeruginosa biofilm, developed over UPVC, MDPE, DCI, and SS, with corresponding HPCs of 4.79, 6.38, 8.81, and 7.24 CFU/cm2. The highest cell densities of Enterococcus faecalis biofilm in the identical situation were 4.19, 5.89, 8.12, and 6.9 CFU/cm2. The nanocomposite CCS/AgMMT-2.5 exhibited the largest measured zone of inhibition (ZOI) against both P. aeruginosa and E. faecalis, with measured ZOI values of 19 ± 0.65 and 17 ± 0.21 mm, respectively. Remarkably, the research indicates that the youngest biofilm exhibited the most notable rate of inactivation when exposed to a dose of 150 mg/L, in comparison to the mature biofilm. These such informative findings could offer valuable insights into the development of effective antibiofilm agents and materials applicable in diverse sectors such as water treatment facilities, medical devices, and industrial pipelines.

Use of the nitrogen/ oxygen isotope fractionation technique for tracing nitrogen removal from activated sludge in municipal wastewater treatment plants

The dual isotope fractionation technique of nitrogen and oxygen has been successfully applied to analyze microbially-driven nitrogen transformations and partitioning in aquatic ecosystems, but not in municipal water treatment facilities. Nitrogen removal efficiency in wastewater treatment plants using activated sludge is critical and difficult to monitor. Here, we tested the nitrogen and oxygen isotope fractionation technique for capacity to trace nitrogen removal from municipal wastewater. Long-term monitoring of Anaerobic/anoxic/aerobic (A2/O) process municipal wastewater treatment plants revealed that nitrogen removal performance gradually improved with increasing seasonal temperatures. The δ15N value of activated sludge increased from 5.18‰ (January) to 6.37‰ (June). An increase in temperature promoted the increase in NO3--N from 1.23 mg/L (January) to 6.06–7.02 mg/L (June to August) in the aerobic reaction. The δ15NNO3 decreased from 17.82‰ to 37.37‰ to 4.09–17.68‰, and variability in utilization of light and heavy isotopes gradually decreased. The slope of the ratio δ15NNO3:δ18ONO3 gradually decreased from 21.58 ± 12.15 (January) to 0.57 ± 0.51 (August). The dynamic response of δ15N values in sludge and isotopes in water revealed the migration transformation of nitrogen and realized the differential analysis to denitrification performance with seasonality. It also provided a technical basis for long-term stable nitrogen removal system.

Rapid and efficient inactivation of viruses in seawater by LIG electrodes

Water-borne viral diseases are a significant concern for public health. In particular, they threaten the health of people and animals in countries that lack proper water treatment facilities. Novel water treatment technology may efficiently improve water quality and prevent the spread of waterborne viral pathogens. Laser-induced graphene (LIG) has been shown to inactivate viruses and bacteria with its photothermal properties, electrochemical reaction, and rough surface texture. However, LIG's activity to prevent virus transmission via contaminated water has not been fully explored. Here, we demonstrated that enveloped and non-enveloped viruses in seawater could be rapidly inactivated by LIG technology. After being activated by 3 V of electricity, the LIG electrodes inactivated both types of viruses spiked in water within 30 min. In addition, the electrolyzed seawater exhibited virucidal effects even after the cessation of the electrical charge. The generation of different oxidants, such as chlorine, chlorine dioxide, and hydrogen peroxide, may play an essential role in the antiviral mechanism of the LIG electrodes. Furthermore, after 10 min of electrolysis, the pH of the seawater dropped from approximately 8–5, which may also have contributed to the virucidal effects of the LIG technology. The virucidal activity of LIG technology highlighted its potential for preventing the spread of viral infections via seawater systems which may have public health implications in areas where seawater is used in the sewage system. It may also have applications in aquaculture, where viral diseases do not have treatments and can cause high fish mortality.

Assessment of Biofilm Growth on Microplastics in Freshwaters Using a Passive Flow-Through System.

Biofilms that colonize on the surface of microplastics (MPs) in freshwaters may pose a potential health risk. This study examined factors that influence MP-associated biofilm growth, including polymer type, degree of weathering, and source water quality. Weathered MPs produced in-lab were employed in biofilm trials conducted on site using a passive flow-through system with raw water at drinking water treatment facility intakes. Adenosine triphosphate (ATP) was used to quantify biofilm abundance; biofilm composition was assessed via metagenomic sequencing. Biofilm growth was observed on all polymer types examined and most prevalent on polyvinyl chloride (PVC), where ATP levels were 6 to 12 times higher when compared to other polymers. Pathogen-containing species including Salmonella enterica and Escherichia coli were present on all polymers with relative abundance up to 13.7%. S. enterica was selectively enriched on weathered MPs in specific water matrices. These findings support the need to research the potential accumulation of pathogenic organisms on microplastic surfaces.

Hygienic assessment of water quality and safety according to national requirements

There are only 15 % of water reservoirs in Ukraine that can be used as sources of water supply, taking into account water treatment facilities. 55 % of polluted objects and 30 % very dirty, water from these sources cannot be used even after cleaning. With the help of sanitary-hygienic, ecological and water management assessment, they ensure the quality of water in the impact on the environment and the quality of fish products. The main documents that determine the quality, properties and chemical composition of drinking water are DSTU 7525:2014 and DSTU 27384:2005, they specify the main toxicological and organoleptic concentrations of chemicals that must be contained in water. The standard “Sources of centralized economic drinking water supply, hygienic and ecological requirements for water quality and selection rules” makes it possible to develop a complex of interrelated standards and norms, including the use, protection and restoration of water resources, objective assessment of the ecological state and quality of surface and underground waters and their compliance with the requirements of EU standards. Water treatment equipment and technologies used nowadays for wastewater treatment do not provide a sufficient degree of purification and disinfection. Surface water reservoirs, along with impurities of natural origin, contain chemical pollution – heavy metals, pesticides, insecticides, oil products, phenols. The methods of wastewater disinfection are divided into chemical, physical, physico-chemical and in the conditions of artificial and natural biocenoses.

Development of a methodology for assessing radiological dose due to use of NORM sludge as fertilizer

In Europe, the general obligation to recycle drives for increased reuse of residues containing Naturally Occurring Radioactive Material (NORM). In agriculture, this has led to the reuse of sludge produced by groundwater filtration facilities as a means of fertilization. In the frame of the RadoNorm project, a methodology was developed for dose assessment of agricultural workers and other members of the public living near agricultural fields in which NORM-containing sludge is applied. Appropriate exposure scenarios were identified and modelled for each relevant NORM decay segment of both U-238 and Th-232 series, as well as for K-40. Dose assessments were performed using the software RESRAD-ONSITE with dose coefficients for external and internal exposure taken from the latest publications from the International Commission on Radiological Protection (ICRP). The objective was to develop a generic methodology to quantify exposure and to obtain screening values – so-called Operational Levels (OLs). These OLs pertain to the activity concentration of natural radionuclides (in terms of kBq kg−1) present in sludge that is reused in agriculture, for which dose criterion of 1 mSv year−1 is complied with. OLs can be used as screening tools by an authority/operator, even non-experts in the field of radiation protection.Results showed that the most critical decay segments are Ra-226+ and Ra-228+, for which OLs of the order of 1 kBq kg−1 were estimated. For all the other radionuclides, the calculated OLs are much higher than the activity concentrations typically found in sludge from water treatment facilities, and the radiological impact expected is well-below 1 mSv year−1. The methodology and results of this study could contribute to the update of the Clearance Levels and discharge levels reported in the European guidelines RP 122 Part II and RP 135, respectively.

Lessons Learned From a Hydrogen Peroxide Pilot Project

An ongoing hydrogen peroxide pilot project at a Connecticut water treatment facility showed promising benefits beyond disinfection precursor oxidation, such as reduced total organic carbon, lower chemical costs, and improved aesthetics.

Study and Verify the Performance Evaluation and Percentage Removal Efficiency of the Plant

Domestic, commercial, and industrial wastewater all belong to the category of urban wastewater. There are various treatment technologies available to treat the waste water from simple oxidation ponds to advanced MBBR systems. The present study is to verify the performance evaluation and percentage removal efficiency of the plant. The various water quality parameters like COD, BOD, TSS, TDS, Oil & Grease , Nitrates, pH, EC, DO, Turbidity and Phosphates of the waste water were being analyzed for the which were collected. Water samples were collected at different stages of treatment plant such as (raw water inlet, Aeration tank, Clarisettler and Treated water outlet) in the weekly basis for a period of 6 weeks before disposal into water body streams. After treatment, the average percentage removal efficiency for the parameters COD, BOD, TSS, TDS, Oil & Grease, and Phosphates was found to be 89%, 88%, 85%, 68%, 69% and 75%. After the analysis the result were finalized by comparing data with CPCB and IS standard values and ultimately, the performance and removal efficiency of the waste water treatment facility was found to be under good condition and the treated water are being used for flush-outs and gardening.

Exploring chlorination as a removal process for antiretroviral drugs (Nevirapine and Efavirenz) from water: Effect of operational parameters, kinetics, and trihalomethane formation

This study investigates the removal of antiretroviral drugs (ARVs), Nevirapine (NVP) and Efavirenz (EFV), from drinking water through chlorination, focusing on the influence of pH, temperature, chlorine concentration, and ARV initial concentration on the degradation kinetics and trihalomethane (THM) formation. At 25 °C and an initial concentration of 100 μg/L, the degradation trends for both ARVs were examined across varying pH levels. EFV exhibited greater pH sensitivity, with removal increasing from 37 % at pH 5.5 to 68 % at pH 8, while NVP removal increased only from 40 % at pH 5.5 to 48 % at pH 8. Temperature also played an essential role, as the removal of both ARVs increased with rising temperature, indicating an endothermic reaction. Higher chlorine concentrations resulted in increased removal, >90 % at 5 mg/L for both ARVs. Kinetic analysis revealed second-order behaviour, with higher rate constants observed at pH 5.5–7 for NVP and pH 7–8 for EFV. The intrinsic chlorination rate constants for both ARVs were estimated. The calculated half-lives indicated slow removal. The study also assessed contact time for NVP and EFV in a plug-flow reactor (PFR) and continuous stirred tank reactor model (CSTR). Also considering hydraulic residence time (HRT) rather than reaction time to assess the average amount of time that the ARVs spent in the selected reactors. The HRT for a CSTR was lower than the PFR, and the estimated HRT for a CSTR was a feasible value. The minimum HRT came out to 1.56 h (pH 7.5 and a temperature of 25 °C) for NVP and 1.07 h (pH 7 and a temperature of 25 °C) for EFV. Finally, THM formation was observed, with chloroform, dibromochloromethane and bromoform detected. Among the three THMs, the most significant change occurred between 4 and 6 h, with chloroform levels increasing from 31.59 μg/L to 63.49 μg/L. This study underscores the influence of operational parameters on ARV removal via chlorination. Highlighting pH sensitivity, temperature control, precise chlorine dosage, and environmental concerns such as trihalomethane formation ensures effective disinfection while minimizing negative impacts on both water quality and the environment. Emphasizing the importance of a comprehensive approach to ARV removal in water treatment processes is a proactive measure that integrates considerations of environmental impact, public health, regulatory compliance, and long-term sustainability into the design and operation of water treatment facilities.

Evaluation of Lead and Iron Content in Different Stages of Water Treatment Facilities within Otuoke and Yenagoa Metropolis, Bayelsa State, Nigeria

The mechanism of keeping water safe by improving its quality makes it easily accessible for community health. The objective of this work was to evaluate the levels of lead and Iron in the domestic water supply system at Ekeki Housing Estate Yenegoa local government and Otuoke community in Ogbia local government in Bayelsa State, Nigeria. AAS version 5.0 Model was used to analyze Iron and Lead after acid digestion. Results obtained were compared with WHO standard, and statistically inferences were drawn using ANOVA and Spearman correlation matrix. All water sampled presented values of lead between (0.02-0.64) mg/L expect for point I3 and I4 which conformed to 0.01mg/L, while Iron values ranged from (0.01-5.3) mg/L. Most of the results obtained exceeded the WHO standard of 0.01 mg/L for lead and 0.03mg/L respectively. The research findings had shown that most treatment processes adopted were not suitable for treatment of the contaminants, hence the need to review treatment processes, distribution and monitoring of the source.

Ceramic Filters for the Efficient Removal of Azo Dyes and Pathogens in Water

Overcoming the scarcity of safe and sustainable drinking water, particularly in low-income countries, is one of the key challenges of the 21st century. In these countries, the cost of centralized water treatment facilities is prohibitive. This work examines the application of low-cost ceramic filters as point-of-use (POU) devices for the removal of methylene blue, o-toluidine blue, Staphylococcus aureus, and Staphylococcus typhi from contaminated water. The ceramic filters had typical kaolinite functional groups, making them suitable for the removal of dyes and pathogens. Surface charge measurements indicated strongly anionic filters, while thermal properties confirmed the carbonization of the biowaste additive leaving behind a porous kaolinite structure which subsequently dehydroxylated into meta kaolinite. In addition, morphological data showed heterogeneous filter surfaces. Increased biomass content improved the permeability, water adsorption, flow rate, and apparent porosity of the filter. The ceramic filter removed methylene blue (42.99–59.74%), o-toluidine (79.95–92.71%), Staphylococcus aureus (98–100%), and Staphylococcus typhi (75–100%). Overall, the study demonstrated the effectiveness of POU ceramic filters in removing organic pollutants in contaminated water while serving as disinfectants.

EPASAD: ellipsoid decision boundary based Process-Aware Stealthy Attack Detector

Due to the importance of Critical Infrastructure (CI) in a nation’s economy, they have been lucrative targets for cyber attackers. These critical infrastructures are usually Cyber-Physical Systems such as power grids, water, and sewage treatment facilities, oil and gas pipelines, etc. In recent times, these systems have suffered from cyber attacks numerous times. Researchers have been developing cyber security solutions for CIs to avoid lasting damages. According to standard frameworks, cyber security based on identification, protection, detection, response, and recovery are at the core of these research. Detection of an ongoing attack that escapes standard protection such as firewall, anti-virus, and host/network intrusion detection has gained importance as such attacks eventually affect the physical dynamics of the system. Therefore, anomaly detection in physical dynamics proves an effective means to implement defense-in-depth. PASAD is one example of anomaly detection in the sensor/actuator data, representing such systems’ physical dynamics. We present EPASAD, which improves the detection technique used in PASAD to detect these micro-stealthy attacks, as our experiments show that PASAD’s spherical boundary-based detection fails to detect. Our method EPASAD overcomes this by using Ellipsoid boundaries, thereby tightening the boundaries in various dimensions, whereas a spherical boundary treats all dimensions equally. We validate EPASAD using the dataset produced by the TE-process simulator and the C-town datasets. The results show that EPASAD improves PASAD’s average recall by 5.8% and 9.5% for the two datasets, respectively.

MATHEMATICAL ANALYSIS OF THE SORPTION PROCESS OF MINE WATER PURIFICATION

Contaminated mine water with a large amount of salts makes underground and surface water sources unsuitable for household and drinking needs. Already in 2016, there was a shortage of drinking water in the Rostov region. Water from surface sources does not meet the hygienic requirements for chemical parameters in 36.1% of the samples taken. Water from underground sources in terms of color, turbidity, total hardness, dry residue, content of iron ions, manganese, hydrogen sulfide, nitrates, ammonia, chlorides, sulfates, magnesium, sodium did not meet the required standards in 72.2% of cases. Due to the need for huge expenses for the purification of highly mineralized waters and the poor development of cheap technologies for the neutralization of large volumes, attempts to purify discharged or flowing mine waters to a safe level turn out to be practically fruitless. In this article, studies were carried out to reduce the concentration of dissolved ions of heavy metals (iron, manganese, copper and zinc) in mine wastewater by sorption in a static mode (charring) using rice husk biochar with electromagnetic treatment. The authors proposed a method for pre-treatment of the sorbent from rice husk biochar in an electromagnetic field at a process activation unit. The results of laboratory tests confirmed the high efficiency of the sorbent for the removal of heavy metal ions from mine waters. On the basis of the results obtained, optimization of the sorption purification of mine waters in the mode of carbonization was carried out using the method of mathematical planning of the experiment (full factorial experiment FFE 2k). The factors most influencing the efficiency of mine wastewater treatment from iron and zinc ions have been identified. With a probability of 0.95, the proposed models are adequate, and they can be used to describe the sorption process when using the studied sorbent to remove heavy metal ions (iron, zinc, etc.), while the optimal concentration of the sorbent from rice husks is within 0.5 mg/l. With an increase and decrease in the concentration of the sorbent above the optimal values, the efficiency of sorption decreases, and this affects the iron to a greater extent. In general, the obtained sorbent has a chemical composition similar to that of activated carbon (the most widely used sorbent for water purification), but at the same time it is a cheap production waste, which confirms its efficiency, both technological and economic, when used to purify natural and waste water. With the introduction of the proposed treatment scheme for mine water treatment facilities, it is expected that the concentrations of dissolved heavy metal ions, in particular, iron, zinc, manganese, will decrease to the concentration of the discharge into the reservoir.