scholarly journals Removal of Metals by Sulphide Precipitation Using Na2S and HS−-Solution

2020 ◽  
Vol 4 (3) ◽  
pp. 51
Author(s):  
Hanna Prokkola ◽  
Emma-Tuulia Nurmesniemi ◽  
Ulla Lassi
Keyword(s):  
Mine Water ◽  
Mine Drainage ◽  
Anaerobic Treatment ◽  
Reduction Reaction ◽  
Sulphate Reduction ◽  
Acidic Mine Drainage ◽  
Acid Mine Water ◽  
Metal Hydroxides ◽  
Sulphide Precipitation ◽  
Ph Dependent

Precipitation of metals as metal sulphides is a practical way to recover metals from mine water. Sulphide precipitation is useful since many metals are very sparingly soluble as sulphides. Precipitation is also pH dependent. This article investigates the precipitation of metals individually as sulphides and assesses which metals are precipitated as metal hydroxides by adjustment of the pH. The precipitation of different metals as sulphides was studied to determine the conditions under which the HS− solution from the sulphate reduction reaction could be used for precipitation. H2S gas and ionic HS− produced during anaerobic treatment could be recycled from the process to precipitate metals in acidic mine drainage (AMD) prior to anaerobic treatment (Biological sulphate reduction), thereby recovering several metals. Precipitation of metals with HS− was fast and produced fine precipitates. The pH of acid mine water is about 2–4, and it can be adjusted to pH 5.5 before sulphide precipitation, while the precipitation, on the other hand, requires a sulphide solution with pH at 8 and the sulphide in HS− form. This prevents H2S formation and mitigates the risk posed from the evaporation of toxic hydrogen sulphur gas. This is a lower increase than is required for hydroxide precipitation, in which pH is typically raised to approximately nine. After precipitation, metal concentrations ranged from 1 to 30 μg/L.

scholarly journals PENGARUH JENIS SEDIMEN WETLAND DALAM REDUKSI SULFAT PADA LIMBAH AIR ASAM TAMBANG (AAT)

2016 ◽  
Vol 10 (1) ◽  
pp. 26 ◽  
Author(s):  
Fahruddin Fahruddin
Keyword(s):  
Environmental Pollution ◽  
Mine Water ◽  
Chemical Method ◽  
Environmentally Friendly ◽  
Mining Waste ◽  
Rice Fields ◽  
Sulphate Reduction ◽  
Mining Activities ◽  
Acid Mine Water ◽  
Sediment Treatment

Increasing mining activities in several regions in Indonesia, began to faceproblems, namely of environmental pollution. One of the mining waste that is liquidsulfur, or acid mine water, which can lower the pH of the water and dissolves heavymetals. Countermeasures for the chemical method is to use lime, but this is lesseffective. The method is good and is environmentally friendly way by using biologicalbacteria sulphate reduction bacteria (SRB) that naturally there are many in thesediment wetland. Goal of this research is to find the type of sediment wetland mosteffectively increase the pH and decrease the concentration of sulphate in acid minewater. The sediment wetland is used mangroves, swamp, rice fields, and beaches.Treatment bioreaktor made on the filled with sediment underneath the compost isgiven further incubation for 50 days. The observation of pH and content of sulphatebased on the value of OD spektrofotometer and known pH increased to the highestin the pH of 7.3 is in the swamp sediment treatment, while the only other treatmentuntil the pH 6-6,7. Increasing the pH in accordance with the decrease in the rate ofSO4 is most sharply in the swamp sediment treatment as well as the most effectivetreatment.

Using Acid Mine Water for Removal of Phosphates from Sewage Effluent

1983 ◽  
Vol 15 (2) ◽  
pp. 155-167
Author(s):  
P H van der Merwe ◽  
J P Maree ◽  
N D Basson
Keyword(s):  
Mine Water ◽  
Mine Drainage ◽  
Iron Phosphate ◽  
Phosphate Removal ◽  
Sewage Effluent ◽  
Acid Mine Water ◽  
High Iron Content ◽  
Sewage Purification ◽  
Ph Increase ◽  
The Cost

An experiment was carried out at the Rondebult sewage purification works, regarding the use of underground mine water with a high iron content for phosphate removal from sewage effluents, to comply with a limit of 1 mg/ℓ soluble orthophosphates in the effluent. The theory of iron phosphate precipitation is discussed and reference made to phosphate removal plants in Wisconsin, U.S.A. Iron and aluminium salts did not seem to harm biological life on the filter. The dosing of mine drainage appeared to inhibit nitrification, reduce the pH increase through the filters, increase TDS by about 500 mg/ℓ, but an equivalent dosage of 20 mg/ℓ Fe maintained the final P below 1 mg/ℓ at a cost of 0,1 c/m3, one-tenth of the cost if chemicals had been used.

scholarly journals KAJIAN PENANGGULANGAN AIR ASAM TAMBANG PADA SALAH SATU PERUSAHAAN PEMEGANG IJIN USAHA PERTAMBANGAN DI DESA LEMO, KABUPATEN BARITO UTARA, KALIMANTAN TENGAH

2016 ◽  
Vol 12 (1) ◽  
pp. 50
Author(s):  
Susan Nadya Irawan ◽  
Idiannor Mahyudin ◽  
Fakhrur Razie ◽  
Susilawati Susilawati
Keyword(s):  
Acid Mine Drainage ◽  
Mine Water ◽  
Mine Drainage ◽  
Research Area ◽  
Low Ph ◽  
Test Results ◽  
Acidic Water ◽  
Acid Mine Water ◽  
Acid Mine ◽  
Dry Cover

This study aims to know the factors that cause the formation of Acid Mine Water, to analyze the methods of prevention of acid mine drainage has been running effectively, to analyze how to prevent the formation of acid mine water at the research area. This research was conducted atLemovillage,North Barito Regency. These results indicate the analysis of water quality in the company with an indication acidic low pH values and high metal values. It is supported by soil pH test results showed low pH, especially on the layer in direct contact or close to coal. Sources of acid mine drainage at the company are from the oxidation of water and oxygen on the wall of rock at pit, water from the dumping area, water flowing from the temporary stockpile into the settling pond 2. From these, we can conclude the results. Recommendations prevention of acid mine drainage can be done by moving the location of the temporary stockpile in accordance with, more effective functioning of sump, controlling the movement of acidic water that has formed, accommodate and neutralize the acidic water that has formed, forming a layer of dry cover, separating the flow of water is not acidic and acidic

Treatment of Acid Mine Drainage Water Using Fly Ash and Water Softening Sludge

1991 ◽  
Vol 245 ◽  
Author(s):  
Asmare Atalay ◽  
Srinivas Chaluvadi ◽  
Joakim G. Laguros ◽  
Jerry J. Black
Keyword(s):  
Fly Ash ◽  
Acid Mine Drainage ◽  
Mine Water ◽  
Environmental Protection Agency ◽  
Mine Drainage ◽  
Abandoned Mines ◽  
Water Quality Criteria ◽  
Water Softening ◽  
Acid Mine Water ◽  
Acid Mine

ABSTRACTAcid mine drainage (AMD) is being recognized as a major pollution source to surface water. Heavy trace metals emanating from abandoned mines are continuously being released and contaminating surrounding lakes and streams. The potential for utilizing fly ash and water softening sludge (WSS) as buffering and adsorption media for AMD water was assessed. The results indicated that AMD water treated with fly ash either met or exceeded the U.S. Environmental Protection Agency water quality criteria for effluent standards for total iron, manganese, suspended solids, and pH. The optimum dosage of fly ash and sludge needed for treating the acid mine water from Picher field, an abandoned lead and zinc mine in Oklahoma, has been determined. It was observed that each had better than 90 percent efficiency for removal of heavy metals from the AMD water. The combined use of fly ash and WSS was also investigated, but there was no significant improvement compared to using fly ash alone. In general fly ash had a greater buffering capacity to treat acid mine water than did WSS. Consequently, fly ash can be used to treat AMD water and minimize its environmental impact.

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