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What should be added to verify the acidity of 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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What should be added to verify the acidity of wastewater
Removal and Recovery of Sulfur from Sulfide Dye ...
Removal and Recovery of Sulfur from Sulfide Dye ...

Removal and ,recovery, of sulfur from ,sulfide, dye intermediate ,wastewater, was studied by iron clip filtration coagulation process.The results show that under the optimum operating conditions the removal rate of sulfur and COD are 98.5% and 65.0% respectively.After treatment the effluent is clear and transparent.At the same time Na 2S ,solution, with mass fraction of 56% can be recovered and reused ...

Subject:
Subject: "sodium sulfide" / Journal: Journal of hazardous ...

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Total Sulfide Methylene Blue Method
Total Sulfide Methylene Blue Method

2/11/2012, · ,Sulfide, is separated from the sample matrix by suspending the sample in a hydrochloric ,acid solution, and vigorous agitation. Hydrogen ,sulfide, gas is released from the sample and collected in a gas scrubbing bottle cotaining ,sodium, hydroxide. The methylene blue method is based on

Nitrogen and Phosphorus Recovery from Wastewater (pdf ...
Nitrogen and Phosphorus Recovery from Wastewater (pdf ...

Biological assimilation through constructed wetlands removes both N (83–87 %) and P (70–85 %) from wastewaters, with ,recovery, in the form of fish/animal feeds and biofuel. The paper discusses methods and important results on ,recovery, of nitrogen and phosphorus from ,wastewater,.

Minerals | Free Full-Text | Release Behaviors of Arsenic ...
Minerals | Free Full-Text | Release Behaviors of Arsenic ...

Therefore, precipitation employing sulfide as a precipitant via sodium sulfide or hydrogen sulfide, which generates As 2 S 3 precipitate with a higher purity and at a much lower amount compared to the sludge generated by neutralization or co-precipitation, has become a potential treatment technology for strongly acidic wastewater, to realize the recycling of metals and minimize the amount of arsenic waste .

[PDF] Application of sodium- and biogenic sulfide to the ...
[PDF] Application of sodium- and biogenic sulfide to the ...

The ,recovery, of nickel ,sulfide, was improved when the initial pH of the ,solution containing, each metal was set to 7. In such a condition the removal efficiency of nickel was 99.9%, corresponding to a residual level of 0.13 mg L −1 for nickel in ,solution,.

Minerals | Free Full-Text | Release Behaviors of Arsenic ...
Minerals | Free Full-Text | Release Behaviors of Arsenic ...

Therefore, precipitation employing sulfide as a precipitant via sodium sulfide or hydrogen sulfide, which generates As 2 S 3 precipitate with a higher purity and at a much lower amount compared to the sludge generated by neutralization or co-precipitation, has become a potential treatment technology for strongly acidic wastewater, to realize the recycling of metals and minimize the amount of arsenic waste .

Special Issue
Special Issue "Separation and Leaching for Metals Recovery"

Furthermore, the result was compared with that for the sulfuric ,acid solution containing, neither Cu 2+ nor O 2 and with the sulfuric ,acid solution, without Cu 2+ and O 2. When both Cu 2+ and O 2 2+ concentration, and 100 cc/min O 2 introduction. These results indicated that the leaching of Cu from Cu metal could be accelerated by adding Cu 2 ...

Special Issue
Special Issue "Separation and Leaching for Metals Recovery"

Furthermore, the result was compared with that for the sulfuric ,acid solution containing, neither Cu 2+ nor O 2 and with the sulfuric ,acid solution, without Cu 2+ and O 2. When both Cu 2+ and O 2 2+ concentration, and 100 cc/min O 2 introduction. These results indicated that the leaching of Cu from Cu metal could be accelerated by adding Cu 2 ...

Factors Affecting Metal Removal in Mixed Sulfide ...
Factors Affecting Metal Removal in Mixed Sulfide ...

Abstract ,Sulfide, precipitation of nickel and cobalt was investigated in three reactors: batch, seeded fluidized bed with an aqueous ,sulfide, source, and bubble column with a gaseous ,sulfide, source. ...

Dechelation of Cd-EDTA complex and recovery of EDTA from ...
Dechelation of Cd-EDTA complex and recovery of EDTA from ...

Washing water ,containing, poorly degradable heavy metal-EDTA complexes is produced by ethylenediaminetetraacetic ,acid, (EDTA) washing of heavy metal-contaminated soil. A series of batch experiments were performed to explore the dechelation of heavy metal-EDTA complexes and the ,recovery, of EDTA from simulated soil-washing ,solution, using ,sulfide, precipitation with Na₂S.

[PDF] Application of sodium- and biogenic sulfide to the ...
[PDF] Application of sodium- and biogenic sulfide to the ...

The ,recovery, of nickel ,sulfide, was improved when the initial pH of the ,solution containing, each metal was set to 7. In such a condition the removal efficiency of nickel was 99.9%, corresponding to a residual level of 0.13 mg L −1 for nickel in ,solution,.

Sulfide clean-up of solutions from heavy metal ions ...
Sulfide clean-up of solutions from heavy metal ions ...

OSTI.GOV Journal Article: ,Sulfide, clean-up of solutions from heavy metal ions

Ammonium recovery from process water of digested sludge ...
Ammonium recovery from process water of digested sludge ...

First bench-scale investigations have been conducted using synthetic process water based on a ,sodium, bicarbonate/carbonate buffer ,solution, (c = 0.01 mole/l) and ,containing, ammonium chloride (c = 1,150 mg/l NH 4-N). The temperature and pH values were T = 21.1 ± 0.3 °C and pH = 9.2 ± 0.05.

An NPDES Distillation Method for Measuring Total Cyanide ...
An NPDES Distillation Method for Measuring Total Cyanide ...

Three ,wastewater, samples were fortified with K 3 Fe(CN) 6, distilled with the MICRO DIST system, and then analyzed with amperometric detection to evaluate ,recovery,. The samples were believed to have a ,sulfide, interference with the U.S. EPA method; however, the spike recoveries were found to be acceptable with the evaluated procedure.

Hazardous Waste Characteristics | Hazardous Waste Test ...
Hazardous Waste Characteristics | Hazardous Waste Test ...

Reactive ,sulfide,, formerly described in SW‐846 Section 7.3.4.2, referred to those ,sulfide, species that could form hydrogen ,sulfide, gas under mildly acidic conditions. In July 1985, EPA issued interim guidance describing certain threshold levels for cyanide‐ and ,sulfide,‐bearing wastes and laboratory methods for evaluating such wastes.

Hazardous Waste Characteristics | Hazardous Waste Test ...
Hazardous Waste Characteristics | Hazardous Waste Test ...

Reactive ,sulfide,, formerly described in SW‐846 Section 7.3.4.2, referred to those ,sulfide, species that could form hydrogen ,sulfide, gas under mildly acidic conditions. In July 1985, EPA issued interim guidance describing certain threshold levels for cyanide‐ and ,sulfide,‐bearing wastes and laboratory methods for evaluating such wastes.

Total Sulfide Methylene Blue Method
Total Sulfide Methylene Blue Method

2/11/2012, · ,Sulfide, is separated from the sample matrix by suspending the sample in a hydrochloric ,acid solution, and vigorous agitation. Hydrogen ,sulfide, gas is released from the sample and collected in a gas scrubbing bottle cotaining ,sodium, hydroxide. The methylene blue method is based on

Removal and Recovery of Sulfur from Sulfide Dye ...
Removal and Recovery of Sulfur from Sulfide Dye ...

Removal and ,recovery, of sulfur from ,sulfide, dye intermediate ,wastewater, was studied by iron clip filtration coagulation process.The results show that under the optimum operating conditions the removal rate of sulfur and COD are 98.5% and 65.0% respectively.After treatment the effluent is clear and transparent.At the same time Na 2S ,solution, with mass fraction of 56% can be recovered and reused ...

Special Issue
Special Issue "Separation and Leaching for Metals Recovery"

Furthermore, the result was compared with that for the sulfuric ,acid solution containing, neither Cu 2+ nor O 2 and with the sulfuric ,acid solution, without Cu 2+ and O 2. When both Cu 2+ and O 2 2+ concentration, and 100 cc/min O 2 introduction. These results indicated that the leaching of Cu from Cu metal could be accelerated by adding Cu 2 ...

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