Cyanide In Wastewater Research Articles

Cyanide and cyanidation wastes management in gold leaching plants in Siaya County, Kenya.

This study assesses cyanide and cyanidation wastes management practices among small, medium and large-scale gold leaching plants in Siaya County, Kenya. The socio-economic benefits of gold extraction through cyanidation of mercury-contaminated tailings notwithstanding, the study establishes inadequate cyanide and cyanidation wastes management practices which could potentially cause significant environmental and human health impacts. Through structured key-informant interviews with operators from 15 selected gold leaching plants of varying scales of operation, along with field observations, and quantitative analysis utilizing both bivariate and inferential statistical tools, the study reveals inadequacies in cyanide, cyanidation wastewater, and tailings management practices. Key findings highlight widespread contravention of the international cyanide management standards and lack of adoption of advanced cyanidation wastes treatment technologies. Moreover, the study examines Political, Economic, Social, Technological, Environmental, and Legal factors as external factors affecting the management of cyanidation wastes. Consequently, the study recommends adoption of comprehensive cyanide management practices as outlined in the Cyanide Code and technological upgrades to mitigate potential environmental and human health impacts, and enhance regulatory compliance in gold cyanidation. In a nutshell, this study underscores the urgent need for stringent enforcement of environmental and mining industry laws and regulations in order to protect the environment and public health in gold mining regions. These measures are vitally important to ensure responsible mining practices and uphold environmental stewardship while promoting economic growth.

Silver adsorption from gold leaching cyanide wastewater by a green functionalized magnetic graphene oxide Nano-adsorbent

A nanoadsorbent made of magnetic graphene oxide that was functionalized by glutathione (GSH/Fe3O4@GO NPs) was synthetized. Various characterization methods were employed to clarify the adsorbent's morphology and structure. The results confirmed the formation of nanosheets of graphene oxide with the homogenous coating of Fe3O4 nanoparticles and well conjugated glutathione (GSH) on its surface. This adsorbent was utilized to adsorb silver ion from synthetic AgCN solutions at pH = 10.5. A central composite design (CCD) was used to investigate the impact of silver and cyanide concentration. The significance of the concentration of cyanide and its interaction with silver concentration was confirmed. When the concentrations of silver and cyanide were 128 mg/L and 528 mg/L, respectively, the maximum adsorption capacity achieved was 586 mg/g. The successful fitting of the Freundlich isotherm explains the multilayer adsorption on the heterogeneous surface of the adsorbent. This adsorbent also showed significant efficiency in silver adsorption from a real cyanide wastewater sample as was predicted by the statistical model. The silver adsorption capacity of 123 mg/g were obtained from a gold cyanide leaching process wastewater (24.8 mg/L). The GSH/Fe3O4@GO NPs were found to be an effective adsorbent for extracting and separating silver ions from cyanide solutions.

Construction of a novel ternary synergistic CuFe2O4-SnO2-rGO heterojunction for efficient removal of cyanide from contaminated water.

Many industrial effluents release cyanide, a well-known hazardous and bio-recalcitrant pollutant, and thus, the treatment of cyanide wastewater is a major challenge. In the current study, a CuFe2O4-SnO2-rGO nanocomposite was synthesized to remove cyanide from an aqueous system. The structural and morphological characterizations of the nanomaterials were investigated by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and energy dispersive spectra (EDX) analysis. The results revealed that almost 97.7% cyanide removal occurred using the nanocomposite at an initial concentration of 100 mg L-1 within 1 h. The experimental data were fitted to various adsorption models, among which the Langmuir model fitted the data very well, confirming the monolayer adsorption process. The kinetic investigation revealed that the cyanide adsorption process followed a pseudo-second-order kinetic model, indicating a chemisorption process with a high cyanide adsorption capacity of 114 mg g-1. The result of the intraparticulate diffusion model fitting revealed a decreasing slope value (K) from stage 1 to stage 2, indicating that external mass transfer is the predominating step. Moreover, the CuFe2O4-SnO2-rGO nanocomposite shows excellent reusability.

Study on the performance of Anerinibacillus sp. in degrading cyanide wastewater and its metabolic mechanism

Cyanide extraction dominates the gold smelting industry, which leads to the generation of large amounts of cyanide-containing wastewater. In this study, Aneurinibacillus tyrosinisolvens strain named JK-1 was used for cyanide wastewater biodegradation. First, we tested the performance of JK-1 in degrading cyanide under different conditions. Then, we screened metabolic compounds and pathways associated with cyanide degradation by JK-1. Finally, we explored the potential JK-1–mediated cyanide degradation pathway. Our results showed that the optimal pH and temperature for cyanide biodegradation were 7.0 and 30 °C, respectively; under these conditions, a degradation rate of >98% was achieved within 48 h. Untargeted metabolomics results showed that increased cyanide concentration decreased the abundance of metabolic compounds by 71.1% but upregulated 32 metabolic pathways. The Kyoto Encyclopedia of Genes and Genomes enrichment results revealed significant changes in amino acid metabolism pathways during cyanide degradation by JK-1, including cyanoamino acid metabolism, β-alanine metabolism, and glutamate metabolism. Differential metabolic compounds included acetyl-CoA, l-asparagine, l-glutamic acid, l-phenylalanine, and l-glutamine. These results confirmed that cyanide degradation by JK-1 occurs through amino acid assimilation. This study provides new insights into the mechanism of cyanide biodegradation, which can be applied in the treatment of cyanide wastewater or tailings.

Study on the treatment of cyanide gold extraction wastewater by persulfate-electrochemical oxidation

The cyanide gold extraction wastewater from a gold smelter was treated using a persulfate-electrochemical oxidation (PS-EO) coupling process. The optimal process conditions and significance level of each factor were determined using orthogonal experiments, and the precipitates and cathodic precipitates in the system were analyzed and characterized using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscope-energy dispersive spectroscopy (SEM-EDS), and the oxidation removal reaction mechanism of cyanide was further explored. The results showed that voltage, time and PS concentration were the main influencing factors of the cyanide removal extent. When the voltage was 5 V, PS concentration 0.5 g L–1, pH 7, plate spacing 2.5 cm and reaction time 240 min, the removal extents of total cyanide (CNT), free cyanide (CN–), Cu and Zn ions in wastewater reached 98.33 %, 100 %, 99.53 % and 98.86 %, respectively. The removal of cyanide was mainly attributed to the indirect oxidation by SO4•–, •OH and O2•– active radicals produced by activated PS and the direct oxidation of S2O82–. The contribution rate of S2O82– direct oxidation was 42.38 %. The oxidation contribution rates of SO4•–, •OH and O2•– active free radicals were 15.75 %, 29.33 % and 12.54 %, respectively. Compared with simple PS and EO treatment processes, the PS-EO combined process reduced the amount of oxidants and helped to improve the current density of the system, as well as the generation of active free radicals such as SO4•–, •OH and O2•–. Additionally, after PS-EO treatment, there were almost no precipitates such as Zn(CN)2, CuCN, Zn(OH)2 and Cu(OH)2 produced in the wastewater. The cyanide ions in complex ions such as Cu(CN)32– and Zn(CN)42– were completely oxidized to N2 and CO2, and then under the influence of an electric field, the released Cu2+ and Zn2+ ions were directed to migrate to the cathode and precipitate.Finally, the treated wastewater could be directly returned to the grinding or leaching the ore process, thus achieving the goals of being harmless and utilizing cyanide wastewater resources.

Hyperoxidation active species produced by seawater electro membrane reactor assisted electrolytic cell system for simultaneous decyanation and carbon removal

Herein, a novel triple-layered heterojunction catalytic cathode membrane (PVDF/rGO/TFe/MnO2, TMOHccm) was reported and applied in seawater electro membrane reactor assisted electrolytic cell system (SEMR-EC), achieving increased properties for cyanide wastewater treatment. Hydrophilic TMOHccm exhibits higher electrochemical activity (qT* 1.11 C cm−2, qo* 0.03 C cm−2), indicating excellent electron transfer efficiency. Further analysis shows a one-electron redox cycle of exposed transition metal oxides (TMOs) on rGO support mediated oxygen reduction reaction (ORR) process, and calculated results of density functional theory (DFT) demonstrates positive Bader charge (72 |e|) of synthesized catalyst. The developed SEMR-EC was implemented in intermittent-stream operation for treating cyanide wastewater, the system achieved optimized decyanation and carbon removal performance (CN− 100%, TOC 88.49%). Hyperoxidation active species produced SEMR-EC including hydroxyl, sulfate, and reactive chlorine species (RCS) was confirmed. The proposed mechanistic explanation indicated multiple removal pathways relevant to cyanide, organic matter, and iron were elucidated, and the engineering applications prospects were highlighted by cost (5.61 $) and benefit (Ce 399.26 mW m−2 $−1, EFe 248.11 g kWh−1) analysis of the system.

Study on electrosorption behavior of weak metal cyanide complex ions based on coal-based electrode

Using the electrosorption technology treatment the cyanide wastewater has a good treatment effect, but the mechanism is not completely clear. In this paper, we conducted electrosorption experiments using simulated cyanide solutions to study the adsorption kinetics, thermodynamics, adsorption isotherms and analyze the reaction mechanism of zinc-cyanide and copper–cyanide complex ions. The results show that the electrosorption process of weak metals cyanide complexes treated by coal-based (CB) electrode conforms to the second-order kinetic model and follow the Langmuir model, affected by the dipole force and exchange of coordination groups. The equilibrium adsorption amounts of the two species at 2 V were 1.53 and 1.74 times higher than those at open circuit, respectively. During the electrosorption process, affected by the pseudo-capacitance, pore structure of CB electrodes and the charges of complex ions, the zinc-cyanide complex is bound in the double electric layer on the anode surface by the electric field, but partly decomposed to produce zinc ions and forms Zn(OH)2 in alkaline solution then generates ZnO precipitates, a small amount of Zn2+ were electrostatically adsorbed on the cathode surface for reduction deposition. However, the majority of the copper–cyanide complexes were purified by electrostatic adsorption to the double layer near the anode, while a small amount of decomposition occurred to produce Cu(OH)2 in the alkaline system, and almost no copper was deposited by reduction. This research results can enable us to better understand the removal characteristics of the weak metal cyanide complex ions in the process of electrosorption by CB electrode, and have great significance for the application of electrosorption technology to the treatment of cyanide wastewater.

Structural design of SiO2/TiO2 materials and their adsorption-photocatalytic activities and mechanism of treating cyanide wastewater

Cyanide wastewater contains free cyanide and metal-cyanide complexes, which need to be treated before they are discharged. In this study, we synthesized a mesoporous SiO2/TiO2 material, and used it to treat cyanide wastewater by an adsorption-photocatalytic oxidation synergistic method. The effects of material structure and TiO2 loading method on the removal efficiencies of cyanide, copper and zinc were investigated. The experiments proved that the gel-sol method was more effective, and the kinetic and thermodynamic analysis of dark adsorption process was performed. The results indicated that the dark adsorption kinetics conformed to the pseudo second order, and the thermodynamics indicated that it was an endothermic process. The experimental data stated clearly that the degradation efficiency of total cyanide reached 95.98% and the removal efficiencies of copper and zinc reached 92.70% and 98.69% under the conditions of dark adsorption for 0.5 h and photocatalysis for 4.0 h, respectively. The cyanide was chemisorbed on the material surface. XPS, XRD analysis indicated that cyanide was finally decomposed into NO3− and CO2; copper and zinc were removed in the form of CuO, Cu2O, ZnO.

Activity and mechanism of macroporous carbon/nano-TiO2 composite photocatalyst for treatment of cyanide wastewater

Photocatalytic oxidation can effectively treat cyanide wastewater generated from cyanide plating and gold cyanidation extraction process. In this study, monodisperse SiO2 microspheres were prepared by stober method, and macroporous carbon was prepared by template method with SiO2 as template and sucrose as carbon source, and the macroporous carbon/nano-TiO2 composite photocatalyst were prepared by solid-phase dispersion method. The material was characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD)，UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS), photoluminescence (PL), energy spectrometry (EDS), N2 adsorption–desorption test, thermogravimetric analysis (TGA), Raman spectra, and X-ray photoelectron spectroscopy (XPS). The results show that the material has a large specific surface area, excellent pore structure, and light absorption properties. The photocatalytic treatment of cyanide wastewater was carried out by changing variables such as the loading amount of nano-TiO2, light wavelength, and catalyst dosage. The data showed that when the loading amount of nano-TiO2 was 15 wt% and the catalyst dosage was 3 g/L, the degradation efficiency of total cyanide was 98.10% and the removal efficiency of copper and zinc ions were 99.56% and 100%, respectively, after adsorption in cyanide wastewater for 0.5 h and then light illumination under high-pressure mercury lamp for 3 h (air is introduced during this period). Based on the EDS and XPS analyses, macroporous carbon/nano-TiO2 material will decompose Cu(CN)32- and Zn(CN)42- in cyanide wastewater to Cu+, Zn2+ and •CN. Cu+, •CN and CN－ are further oxidized to Cu2+ and CNO－, Cu2+ and Zn2+ will be removed by being adsorbed to the material surface, and CNO－ will be further degraded to carbon oxides (COX) and nitrogen oxides (NOX).

Hydrothermal synthesis of a 3-D SnO2 nanoflower electrode with C and N co-doped interlayer for the degradation of real cyanide wastewater

In this study, a novel three-dimensional SnO2 nanoflower structure (SnO2-NFs) with carbon and nitrogen co-loaded interlayer was prepared via hydrothermal method and used to remove metal-cyanide complexes from real cyanide wastewater. Compared with a pure SnO2-NFs electrode, the C and N co-doped interlayer resulted in the electrode providing a higher oxygen evolution potential (2.30 V vs SCE), smaller crystal size, larger active specific surface area and lower charge transfer resistance. A lifetime acceleration test showed that the fortified lifetime of this new electrode was about 38 times that of the Ti/Sb-SnO2 electrode prepared by the conventional thermal decomposition method. Hence, the Ti/TiONC/Sb-SnO2-NFs electrode exhibited good electrocatalytic activity and stability. The electron spin resonance analysis and quenching of active radical experiments revealed that the generation of •OH, 1O2, •O2− and SO4•− species in this system, among them •OH was the most active species for the oxidation of cyanides. Further analysis using X-ray diffraction and X-ray photoelectron spectroscopy showed that cyanide was finally oxidized to CO2 and NO3–, and the released Cu(I) was mainly deposited on the cathode surface in the form of Cu0 and CuO.

Study on ultrasonic enhanced ozone oxidation of cyanide-containing wastewater

Gold smelting wastewater contains cyanide ions and copper ions, which may cause potential risks to the environment. In this study, a new ultrasonic enhanced ozone (US/O3) oxidation method was developed for the comprehensive treatment of cyanide-containing wastewater, destruction of cyanide and further recovery of copper. The cyanide removal rate and copper recovery rate reached 99.96 % and 99.3 % under the optimum conditions of ozone flow rate of 80 L/h, temperature of 25 °C, reaction time of 15 min and ultrasonic power density of 80 W/L, respectively. The dried sediment was characterized by XRD, SEM and particle size analysis, the results showed that the dry sediment was Cu slag. The experimental results were in accordance with the pseudofirst-order kinetic model with apparent rate constants of 0.1662 L/(mg·min) and 0.2056 L/(mg·min) for ozone oxidation and ultrasonic enhanced ozone (US/O3) oxidation, respectively. The mechanism of ultrasonic enhanced ozone was studied by FT-Raman, FT-IR, EPR and Gas chromatography. Ultrasonic enhanced ozone (US/O3) oxidation process for treatment of cyanide containing wastewater is characterized by rapid and complete decomposition of cyanide in wastewater and efficient recovery of valuable element copper.

Functional Ag-doped coralloid titanosilicate zeolite (CTS-Ag) for efficiently catalytic and photodegradative removal of free cyanides and copper/zinc-cyanide complexes in real wastewater

Cyanide wastewater, as a highly toxic pollutant, has detected in cyanidation factories, which is seriously harmful to the environment so that the further treatment is needed. In the present study, a simple and effective Ag-doped coralloid titanosilicate zeolite (CTS-Ag) with high adsorption and catalytic performance was developed via hydrothermal method and ion exchange method in order to investigate as a catalytic activity for the degradation of cyanide wastewater. The prepared materials were characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), thermogravimetric analysis (TGA), ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS), N2 adsorption-desorption test and X-ray photoelectron spectroscopy (XPS). Besides these, photocatalytic performance of CTS-Ag was evaluated by photodecomposition of cyanide and generation of reactive oxygen species (ROS), and the effects of components, doping concentration, catalyst dosage, wastewater concentration and wavelength of light source were investigated. The results showed that the degradation efficiencies of total cyanide, copper and zinc could reach 98.00%, 99.41% and 98.44%, respectively. The kinetics of cyanide degradation followed the pseudo-first-order model. The degradation mechanism of cyanides was elucidated based on synergistic effect of photocatalytic oxidation and the functional Ag2O. Although the metal doped in the photocatalyst can improve its properties, the Ag2O species deposited on the surface can directly participate in the reaction with the pollutants to accelerate their enrichment and degradation thus significantly improved the degradation ability for cyanides. The photoelectric properties of CTS-Ag obviously improved the migration and separation of photo-generated electrons (e−) and holes (h+), so that high photocatalytic efficiency was obtained. XPS analysis showed that cyanide was finally degraded to COX/NOX, and the copper and zinc were removed in the form of Cu (II) and Zn (II).

Heterogeneous Photocatalytic Pilot Plant for Cyanide Decontamination: A Novel Solar Rotary Photoreactor

Abstract During the gold extraction in opencast mining, many hazardous substances, such as cyanide, are spilled into the water bodies. This study's aim was to develop a novel rotary photocatalytic TiO2-based reactor to remove cyanide from polluted water using a rotary concentrator photoreactor (RCPR). This pilot-scale reactor was tested with synthetic cyanide water at concentrations from 0.05 to 50 ppm, varying the pH and commercial TiO2 load. The optimal conditions from experimental data were 87.4% of cyanide removal and catalyst load of 0.30 g/L at pH 9.5. Further, samples of cyanide water from an opencast gold mine were treated, achieving removal of 68.7% after 240 min. Our value-added is the rotary motion of the set of four glass tubes, achieving satisfactory performance, which is promising for cyanide wastewater treatment with a more compact footprint than a standard compound parabolic collector (CPC) solar photoreactor. Thus, it was possible to reduce mass and heat transfer limitations with a simple design by considering this photoreactor as a photocatalytic process intensifier.

Effect and mechanism of cyanide degradation and Cu/Zn recovery by photoelectro-catalytic oxidation

• The photoelectrocatalytic system can effectively degrade cyanide wastewater. • The bending of the TiO 2 energy band occurs to improve the catalytic performance. • The catalyst and degradation products can be separated from the electrolyte. • The catalytic mechanism of total cyanide, Cu and Zn cyanide complexes was revealed. Cyanide wastewater contains highly toxic substances such as cyanide and metals. A simple and efficient photoelectro-catalytic oxidation method was proposed. Effect and mechanism of cyanide degradation and Cu/Zn recovery by photoelectro-catalytic oxidation were investigated. The experimental results show the degradation efficiency of total cyanide and removal efficiencies of copper and zinc reached 96.90%, 99.76% and 90.56%, respectively, under the optimum conditions of 2.5 V external bias voltage and 4.0 h with air and lighting. An external electric field can significantly improve the migration and separation of photo-generated electrons ( e – ) and holes ( h + ), thereby increasing the photocatalytic efficiency. Simultaneously, the surface potential of semiconductor is lower than the body under the action of bias voltage and leads to energy band bending. XPS analysis indicates that cyanide is finally degraded into carbon oxide and nitrogen. Cu and Zn are mainly recovered as elementary substance.

The Method of Electroplating Wastewater Treatment and the Comparison of Adsorption Materials

In this study, the chemical method was used to treat electroplating wastewater by chemical method and biological method, and the hydrogen-catalytic oxidation method was used for pretreatment of cyanide wastewater. For the selection of adsorbent materials containing lead wastewater pretreatment, the method of using a single factor experiment exploits the amount of investment, initial concentration, adsorption time on the adsorption amount and the adsorption rate, and the results showed that when the dosage was 0.5 g·L-1, the adsorption rate of platycladus orientalis bark to Pb2+ was 88.41%,which was the highest compared with other adsorption materials; when the initial concentration is large, the lateral cerridge maintains a high adsorption amount and reaches 51.39 mg·g-1. This value is significantly higher than other materials that have been reported, such as constituents, walnuts, etc. The adsorption time reaches the adsorption balance after 30 min. The platycladus orientalis bark exhibits the best adsorption in the end.

Activity and Mechanism for Treatment of Actual Cyanide Wastewater by Macroporous Carbon/Nano-Tio2

Activity and Mechanism for Treatment of Actual Cyanide Wastewater by Macroporous Carbon/Nano-Tio2

Turning Pore Size of Silica-Based Nano-TiO₂ for Treating Cyanide Wastewater.

Cyanide wastewater is a very highly toxic substance. In this study, a kind of silicon-based nano-TiO₂ material by turning pore size accurately is prepared to treat cyanide wastewater. The materials are characterized by XRD, TG analysis, N₂ adsorption/desorption test, UVAS analysis and TEM. Results show that adding NaCl to the synthesis of silica supports can change the size of pores. It emerges that pore size can affect the catalytic performance of the material. Catalytic experiments confirm that cyanide has the best catalytic effect when it has a pore size of 16.47 nm. UVAS spectrum demonstrate that the cyanide has been broken down rather than adsorbed onto the material.

CO2‐Mediated Non‐Destructive Cyanide Wastewater Treatment

AbstractThe facile removal of cyanide anions from cyanide‐containing water was achieved using CO2 in conjunction with aldehydes which can be recycled from the process. The conversion of the cyanide ion into an insoluble cyanohydrin in water allowed the removal of cyanide and could be used as a method for treating cyanide contaminated wastewater and for recovering cyanide or cyanohydrins for further applications.

Enhanced photocatalytic oxidation degradability for real cyanide wastewater by designing photocatalyst GO/TiO2/ZSM-5: Performance and mechanism research

Cyanide wastewater contains highly toxic contaminants such as free cyanide and metal-cyanide complex, it is necessary to find the appropriate degradation technologies. In this study, a simple and effective photocatalyst with enhanced adsorption and photocatalytic activity was developed. A new composite photocatalyst was successfully prepared by solid-state dispersion (SSD) method, which combined graphene oxide (GO), nano titanium dioxide (nano-TiO2) and silicon-based zeolite (ZSM-5). The techniques of scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), N2 adsorption–desorption test, X-ray diffraction (XRD), ultraviolet–visible diffuse reflectance spectroscopy (UV–Vis DRS), thermogravimetric analysis (TGA), and X-ray photoelectron spectroscopy (XPS) were used to characterize the samples. The experiments with different content of nano-TiO2, different wavelengths of light source, different catalyst dosage, control experiments of different materials, and the determination of pH value and zeta potential were also carried out. The results showed that the 3.0 g/L of GTZ-60 (GO/TiO2/ZSM-5 composite photocatalyst with a content of 60 wt% TiO2) has the highest photocatalytic degradation efficiency under ultraviolet wavelength which the degradation efficiency of total cyanide and copper could reach 98.73% and 98.96%, respectively. The degradation of total cyanide followed the pseudo-first-order kinetics. The photoelectric properties of GTZ-60 obviously improved the migration and separation of photogenerated electrons (e−) and holes (h+), so that high photocatalytic efficiency was obtained. XPS analysis showed that cyanide was finally degraded to carbon oxide and nitrogen oxide. Copper and zinc are removed in the form of copper (Ⅱ) and zinc (Ⅱ).

Novel Materials for Myco-Decontamination of Cyanide-Containing Wastewaters through Microbial Biotechnology

This study examined the effectiveness of decontamination of industrial cyanide-containing water using mycelium-based lignocellulosic materials. These results suggest that fungi biomass and plant substrates can be used successfully in the treatment of wastewater contaminated by cyanide. Fungi were isolated from old wood samples taken from a tailing dam with high cyanide content (more than 20 years in semi-submerged condition). All isolated fungi belonged to the genus Fusarium. Fusarium oxysporum Schltdl. is most effective for biodegradation of cyanide-containing wastewaters (even at low temperatures). The most optimal lignocellulosic composition for production of mycelium-based biomaterial for biodegradation of cyanide wastewater consists of a uniform ratio of Siberian pine sawdust and wheat straw. The high efficiency of mycelium-based materials has been experimentally proven in vitro at 15-25 ° C. New fungal biomaterials are provide decrease in the concentration of cyanide ions to 79% (P <0.001). Large-scale cultivation of fungi biomass was carried out by the periodic liquid-phase cultivation. The submerged biomass from bioreactor was used as an inoculum for the production of mycelium-based materials for bioremediation of cyanide wastewater in situ (gold mine tailing).