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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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Removal of hexavalent chromium-contaminated water and ...
Removal of hexavalent chromium-contaminated water and ...

Owlad, M. and Aroua, M.K. and Daud, W.M.A.W. and Baroutian, S. (2009) ,Removal of hexavalent chromium-contaminated water and wastewater,: A review. Water Air and Soil Pollution, 200 (1-4). pp. 59-77. ISSN 0049-6979 Full text not available from this repository.Request a copy

Hexavalent chromium - Wikipedia
Hexavalent chromium - Wikipedia

Remediation of hexavalent chromium in groundwater and drinking water There are mainly three types of methods to remediate hexavalent chromium in ground water and drinking water: 1) reduction of toxicity, 2) removal technologies and 3) containment technologies.

Removal of hexavalent chromium-contaminated water and ...
Removal of hexavalent chromium-contaminated water and ...

Owlad, M. and Aroua, M.K. and Daud, W.M.A.W. and Baroutian, S. (2009) ,Removal of hexavalent chromium-contaminated water and wastewater,: A review. Water Air and Soil Pollution, 200 (1-4). pp. 59-77. ISSN 0049-6979 Full text not available from this repository.Request a copy

Hexavalent chromium - Wikipedia
Hexavalent chromium - Wikipedia

Remediation of hexavalent chromium in groundwater and drinking water There are mainly three types of methods to remediate hexavalent chromium in ground water and drinking water: 1) reduction of toxicity, 2) removal technologies and 3) containment technologies.

Hexavalent Chromium Removal from Water Using Heat-Acid ...
Hexavalent Chromium Removal from Water Using Heat-Acid ...

Red Mud, Heat-,Acid Treatment,, Adsorption Isotherm, ,Hexavalent Chromium, Removal 1. Introduction ,Hexavalent chromium, is one of the heavy mental contaminants found in the water which is used in a variety of applications including electroplating, steel production, leather tanning, mining and textile dyeing [1]. ,Chromium

How to treat electroplating wastewater - Screen Factory
How to treat electroplating wastewater - Screen Factory

Treatment, of ,chromium containing wastewater, There are two basic routes for the ,treatment, of ,hexavalent chromium wastewater,: – The ,hexavalent chromium, is reduced to trivalent ,chromium, with low toxicity, and then removed by chemical precipitation, including chemical reduction, electrolytic reduction and agglomeration, etc.

Hexavalent Chromium Removal from Water Using Heat-Acid ...
Hexavalent Chromium Removal from Water Using Heat-Acid ...

Based on the results, it could conclude that heat-,acid, activated red mud had a significant potential for removing ,hexavalent chromium, from ,wastewater, using adsorption method. 3.2. Mechanism of Adsorption of ,Hexavalent Chromium, on ARM

Treatment of effluent containing PFASs | Industrial ...
Treatment of effluent containing PFASs | Industrial ...

As part of its process, surfactants with PFASs formed a floating layer in the chrome vats and were used to suppress gaseous emissions of hexavalent chromium, volatile organic compounds and other contaminants. These were then taken to the rinse baths and drainage and storm sewers before leaking into underground aquifers.

How to treat electroplating wastewater - Screen Factory
How to treat electroplating wastewater - Screen Factory

Treatment, of ,chromium containing wastewater, There are two basic routes for the ,treatment, of ,hexavalent chromium wastewater,: – The ,hexavalent chromium, is reduced to trivalent ,chromium, with low toxicity, and then removed by chemical precipitation, including chemical reduction, electrolytic reduction and agglomeration, etc.

Cyano-containing wastewater treatment machine - Fuel ...
Cyano-containing wastewater treatment machine - Fuel ...

I – restoration hexavalent chromium Cr +6 to trivalent chromium Cr +3 in chromium-containing wastewater; II – oxidization of cyanides to cyanates in cyano-containing wastewater; III – simultaneous wastewater treatment after mixing neutralized chromium-containing wastewater and cyano-containing wastewater with acid-base wastewater.

Hexavalent Chromium Removal from Water Using Heat-Acid ...
Hexavalent Chromium Removal from Water Using Heat-Acid ...

Based on the results, it could conclude that heat-,acid, activated red mud had a significant potential for removing ,hexavalent chromium, from ,wastewater, using adsorption method. 3.2. Mechanism of Adsorption of ,Hexavalent Chromium, on ARM

Hexavalent Chromium Removal from Water Using Heat-Acid ...
Hexavalent Chromium Removal from Water Using Heat-Acid ...

Red Mud, Heat-,Acid Treatment,, Adsorption Isotherm, ,Hexavalent Chromium, Removal 1. Introduction ,Hexavalent chromium, is one of the heavy mental contaminants found in the water which is used in a variety of applications including electroplating, steel production, leather tanning, mining and textile dyeing [1]. ,Chromium

Removal of Trivalent and Hexavalent Chromium by Seaweed ...
Removal of Trivalent and Hexavalent Chromium by Seaweed ...

13/8/1998, · Removal of ,hexavalent chromium, from electroplating wastewaters using marine macroalga Pelvetia canaliculata as natural electron donor. Chemical Engineering Journal 2016, 290, 477-489. DOI: 10.1016/j.cej.2016.01.070. Emad S. Elmolla, W. Hamdy, A. Kassem, A. Abdel Hady.

Treatment of high-concentration chromium-containing ...
Treatment of high-concentration chromium-containing ...

In order to solve the problem of difficult treatment of high-concentration chromium-containing wastewater, sulfate-reducing bacteria (SRB) with a high tolerance of hexavalent chromium and a strong ability to reduce the compound were isolated from sludge from a sedimentation tank in a leather industrial park and was identified as Desulfovibrio by morphological observation, routine physiological and biochemical …

Removal of Trivalent and Hexavalent Chromium by Seaweed ...
Removal of Trivalent and Hexavalent Chromium by Seaweed ...

13/8/1998, · Removal of ,hexavalent chromium, from electroplating wastewaters using marine macroalga Pelvetia canaliculata as natural electron donor. Chemical Engineering Journal 2016, 290, 477-489. DOI: 10.1016/j.cej.2016.01.070. Emad S. Elmolla, W. Hamdy, A. Kassem, A. Abdel Hady.

The Science of CHEMICAL OXYGEN DEMAND
The Science of CHEMICAL OXYGEN DEMAND

chromium, (trivalent) or the amount of unreacted dichromate (,hexavalent,) can be measured. End products of the reaction are carbon dioxide, water, and various states of the ,chromium ion,. 5 Table 2: Major Oxidants Other than K 2 Cr 2 O 7 and Mn 2 (SO 4) 3 Used in COD Determinations Oxidant Advantages Disadvantages KMnO 4 • Stable for several ...

Treatment of high-concentration chromium-containing ...
Treatment of high-concentration chromium-containing ...

In order to solve the problem of difficult treatment of high-concentration chromium-containing wastewater, sulfate-reducing bacteria (SRB) with a high tolerance of hexavalent chromium and a strong ability to reduce the compound were isolated from sludge from a sedimentation tank in a leather industrial park and was identified as Desulfovibrio by morphological observation, routine physiological …

CHROMIUM REMOVAL FROM TANNERY WASTEWATER …
CHROMIUM REMOVAL FROM TANNERY WASTEWATER …

chromium, removal efficiency was examined investigating various parameters: applied voltage, time, and current density. In thebatch experiment, 500 mL ,chromium,-,containing wastewater, was used for electrocoagulation. ,Chromium, content in the raw ,wastewater, was 340.1 mg/L and after ,treatment, at optimized conditions, ,chromium, content was 6.9 mg/L.

Groundwater pollution - Wikipedia
Groundwater pollution - Wikipedia

Groundwater pollution, (also called groundwater contamination) occurs when pollutants are released to the ground and make their way down into groundwater.This type of water pollution can also occur naturally due to the presence of a minor and unwanted constituent, contaminant or impurity in the groundwater, in which case it is more likely referred to as contamination rather than pollution.

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