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Industries with acidic wastewater

Established in 2001, Puyang Zhong Yuan Restar Petroleum Equipment Co.,Ltd, “RSD” for short, is Henan’s high-tech enterprise with intellectual property advantages and independent legal person qualification. With registered capital of RMB 50 million, the Company has two subsidiaries-Henan Restar Separation Equipment Technology Co., Ltd We are mainly specialized in R&D, production and service of various intelligent separation and control systems in oil&gas drilling,engineering environmental protection and mining industries.We always take the lead in Chinese market shares of drilling fluid shale shaker for many years. Our products have been exported more than 20 countries and always extensively praised by customers. We are Class I network supplier of Sinopec,CNPC and CNOOC and registered supplier of ONGC, OIL India,KOC. High quality and international standard products make us gain many Large-scale drilling fluids recycling systems for Saudi Aramco and Gazprom projects.

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Industries with acidic wastewater
ISSN: 2456-9992 Chemical Method For Wastewater Management ...
ISSN: 2456-9992 Chemical Method For Wastewater Management ...

usually conducted in a batch reactor for easy ,control, of pH, which is often in the range of 3-3.5. The reaction occurs in an oxidation tank, in which ,wastewater, is initially allowed to flow into the tank, followed by addition of dilute H 2 SO 4 to ensure acidic conditions. Further to that, catalyst and ,acid, or

A Novel Approach to Prevention of Acid Rock Drainage (ARD ...
A Novel Approach to Prevention of Acid Rock Drainage (ARD ...

The proposed research will evaluate a novel agent for its potential to: (1) ,control acid, rock drainage (ARD) at its source, and (2) stop ARD once it starts. The agent in low concentrations is a potent toxicant to acidophilic ,pyrite,-oxidizing bacteria. These bacteria play a major role in the formation of ARD from sulfidic mine tailings.

MaxH O DESALTER technology treats calcium sulphate ...
MaxH O DESALTER technology treats calcium sulphate ...

quality issue for mining operations, and its ,control, levels are based primarily on secondary drinking water recommendations of approximately 500 mg/L. Two methodologies are mainly used, stand-alone or in combinationto remove ,sulphate from ,acid, mine water: membrane separation or salt precipitation, for example formation of gypsum.

Acid Mine Drainage Reduced with Calcium Hydroxide (Lime ...
Acid Mine Drainage Reduced with Calcium Hydroxide (Lime ...

The low acidity of the water is a byproduct of the oxidation ,of pyrite,, the crystalline form or iron sulfide. ,Acid, mine drainage can be easily spotted by the orange color of the water. Laws have been passed by the Department of Environmental Protection to deter any new mining from creating AMD.

ALKALINE FOUNDATION DRAINS AND ALKALINE AMENDMENTS …
ALKALINE FOUNDATION DRAINS AND ALKALINE AMENDMENTS …

Thiobacillus thiooxidans, and Thiobacillus ferrooxidam) can oxidize ,pyrite, in concentrations as low as 1% oxygen. The problems occur when there is an insufficient amount of alkaline material in the refuse to neutralize the ,acid, produced and the resulting AMD seepage is formed (Watzlaf and Hammack).

Recovery of Calcium Carbonate from Wastewater Treatment ...
Recovery of Calcium Carbonate from Wastewater Treatment ...

and calcium ions participate in the depressive effect on ,pyrite, by the formation of mixed films of Fe(OH), FeO(OH), CaSO. 4 . and CaCO. 3. on the surface [15]. The aim of this study was to recover calcium carbonate which was used after treatment of ,acid, mine water from the sludge. Flotation was selected as a feasible technique to recover the CaCO. 3

Lactate oxidation in pyrite suspension: a Fenton-like ...
Lactate oxidation in pyrite suspension: a Fenton-like ...

A complete set of ,control, experiments in both aerobic and anaerobic atmospheres unequivocally established that the ,pyrite, in aqueous solution could spontaneously in situ generate (·)OH and H(2)O(2), serving as a Fenton-like reagent to catalyze the oxidation …

Constructed Wetlands for Treating Acid Mine Drainage
Constructed Wetlands for Treating Acid Mine Drainage

presence of pyrite. Steps which can be taken to control AMD are as follows: waste segregation and blending, base additives, covers and caps, bactericides, collection and treatment of contaminants, and bioremediation (Durkin & Herrmann 1994). Waste segregation and blending requires the mixing of acid-generating rocks with enough rock

Lactate oxidation in pyrite suspension: a Fenton-like ...
Lactate oxidation in pyrite suspension: a Fenton-like ...

A complete set of control experiments in both aerobic and anaerobic atmospheres unequivocally established that the pyrite in aqueous solution could spontaneously in situ generate (·)OH and H(2)O(2), serving as a Fenton-like reagent to catalyze the oxidation of lactate to pyruvate with no need for additional H(2)O(2).

Acid Mine Drainage Reduced with Calcium Hydroxide (Lime ...
Acid Mine Drainage Reduced with Calcium Hydroxide (Lime ...

The low acidity of the water is a byproduct of the oxidation ,of pyrite,, the crystalline form or iron sulfide. ,Acid, mine drainage can be easily spotted by the orange color of the water. Laws have been passed by the Department of Environmental Protection to deter any new mining from creating AMD.

Surface Oxidation of Pyrite as a Function of pH ...
Surface Oxidation of Pyrite as a Function of pH ...

Pyrite,, the most abundant metal sulfide at the surface of Earth, plays a key role in many processes such as ,acid, mine drainage, redox cycling of metals at oxic-anoxic boundaries of lake bottom, and degradation of pollutants. The oxidation ,of pyrite, was studied in batch experiments over a large range of pH (2.5−12), with trace oxygen.

Acid and Metalliferous Drainage–A Global Environmental Issue
Acid and Metalliferous Drainage–A Global Environmental Issue

The aim of source control is to create conditions required to reduce pyrite oxidation rate by limiting O 2 and water ingress to the pyrite surface. A number of control methods have been proposed including application of wet and dry covers (physical barriers), microencapsulation (surface coating), sealing of …

ISSN: 2456-9992 Chemical Method For Wastewater Management ...
ISSN: 2456-9992 Chemical Method For Wastewater Management ...

usually conducted in a batch reactor for easy ,control, of pH, which is often in the range of 3-3.5. The reaction occurs in an oxidation tank, in which ,wastewater, is initially allowed to flow into the tank, followed by addition of dilute H 2 SO 4 to ensure acidic conditions. Further to that, catalyst and ,acid, or

Modified Pyrite: A Column Experiment
Modified Pyrite: A Column Experiment

Abstract: Modified ,pyrite, (MPy), which was obtained from calcination in an N2 atmosphere, was used as a sorbent for removing Hg(II) from aqueous solutions. Fixed-bed column experiments were conducted to determine the Hg(II) removal ability of MPy from aqueous solutions. MPy was found to be much better than natural ,pyrite, for mercury removal.

Acid and Metalliferous Drainage–A Global Environmental Issue
Acid and Metalliferous Drainage–A Global Environmental Issue

The aim of source control is to create conditions required to reduce pyrite oxidation rate by limiting O 2 and water ingress to the pyrite surface. A number of control methods have been proposed including application of wet and dry covers (physical barriers), microencapsulation (surface coating), sealing of …

[PDF] Chemical Forms of Mercury in Pyrite: Implications ...
[PDF] Chemical Forms of Mercury in Pyrite: Implications ...

Pyrite, (cubic FeS2) is the most abundant metal sulfide in nature and also the main host mineral of toxic mercury (Hg). Release of mercury in ,acid, mine drainage resulting from the oxidative dissolution ,of pyrite, in coal and ore and rock resulting from mining, processing, waste management, reclamation, and large construction activities is an ongoing environmental challenge.

Constructed Wetlands for Treating Acid Mine Drainage
Constructed Wetlands for Treating Acid Mine Drainage

presence of pyrite. Steps which can be taken to control AMD are as follows: waste segregation and blending, base additives, covers and caps, bactericides, collection and treatment of contaminants, and bioremediation (Durkin & Herrmann 1994). Waste segregation and blending requires the mixing of acid-generating rocks with enough rock

A Novel Approach to Prevention of Acid Rock Drainage (ARD ...
A Novel Approach to Prevention of Acid Rock Drainage (ARD ...

The proposed research will evaluate a novel agent for its potential to: (1) ,control acid, rock drainage (ARD) at its source, and (2) stop ARD once it starts. The agent in low concentrations is a potent toxicant to acidophilic ,pyrite,-oxidizing bacteria. These bacteria play a major role in the formation of ARD from sulfidic mine tailings.

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