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Control of pyrite acid 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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Control of pyrite acid wastewater
Chromium Removal from Wastewater by Reverse Osmosis
Chromium Removal from Wastewater by Reverse Osmosis

study describes the removal of ,chromium, from ,wastewater, using pressure-driven membrane separation processes. It describes the rejection of ,trivalent chromium, using a commercial membrane for reverse osmosis typed RO98pHt (Alfa Laval, Sweden). Model solutions of ,chromium, were used for performing of separation experiments.

Troubles with trivalent chromium precipitation
Troubles with trivalent chromium precipitation

Troubles with trivalent chromium precipitation, 2006. Hello all Usually I work with hexavalent chrome ,wastewater,. The ,wastewater, is provided by a de-tanning process and the final slurry is a mix among chrome and little bit of organic fibers.

Chromium Total - Hach
Chromium Total - Hach

• ,Trivalent Chromium, Standard Solution, 50 mg/L Cr3+ • 5-mL volumetric pipet, Class A and pipet filler • Mixing cylinders (4), 25 mL • Deionized water • Pipet, TenSette®, 0.1–1.0 mL and tips 1. Prepare a 12.5 mg/L ,trivalent chromium, standard solution as follows: a. Use a pipet to add 5.00 mL of a 50 mg/L Cr3+ standard solution into a 25-mL

Trivalent Chromium Ion Adsorption on Various Types of ...
Trivalent Chromium Ion Adsorption on Various Types of ...

A synthetic ,chromium, nitrate [Cr (NO 3) 3 ⋅ 9 H 2 O] solution adjusted to pH i = 3.2 at 112 mg L − 1 was used. The results revealed that CWS had the best adsorption capacity for ,chromium,, followed by SWS, and adsorption capacity of the different ,wastewater, sludges was in the following order: CWS > SWS ⩾ MWS > PWS > AWS.

Chromium Removal from Wastewater by Reverse Osmosis
Chromium Removal from Wastewater by Reverse Osmosis

study describes the removal of ,chromium, from ,wastewater, using pressure-driven membrane separation processes. It describes the rejection of ,trivalent chromium, using a commercial membrane for reverse osmosis typed RO98pHt (Alfa Laval, Sweden). Model solutions of ,chromium, were used for performing of separation experiments.

Wastewater: Industrial Metal Finishing
Wastewater: Industrial Metal Finishing

discharge. There are four main reasons to control the pH in ,wastewater,: 1. Protect human health and the environment; fish and other living organisms in rivers and streams. 2. Protect the ,wastewater, infrastructure from corrosion, especially from acidic ,wastewater,. 3.

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

13/8/1998, · Biosorption of ,Trivalent Chromium, from ,Wastewater,: An Approach towards Green Chemistry. Chemical Engineering & Technology 2014, 37, 1741-1750. ... Removal and Recovery of ,Chromium, from Solutions Simulating Tannery ,Wastewater, by Strong ,Acid, Cation Exchanger.

Pollution Prevention Technology Profile Trivalent Chromium ...
Pollution Prevention Technology Profile Trivalent Chromium ...

hexavalent ,chromium, to ,trivalent chromium, using sulfur dioxide or sodium bisulfite. Finally, the solution is neutralized to precipitate the ,chromium, as ,chromium, hydroxide. Typical discharge concentrations for hexavalent and/or total ,chromium, in ,wastewater, are 0.1 to 1.0 ppm.

ORPTION COMPARISON OF TRIVALENT CHROMIUM ON …
ORPTION COMPARISON OF TRIVALENT CHROMIUM ON …

charcoal without impregnation, impregnated with potassium hydroxide, zinc chloride, and phosphoric ,acid, was 98.9%, 98.8%, 8.9% and 2.5%, respectively. The study could be helpful to design the sorption of ,trivalent chromium, from the tannery ,wastewater, in-house prior to discharge. Keywords: Sorption, Cr (III) extraction, Impregnation, Environment

Wastewater: Industrial Metal Finishing
Wastewater: Industrial Metal Finishing

discharge. There are four main reasons to control the pH in ,wastewater,: 1. Protect human health and the environment; fish and other living organisms in rivers and streams. 2. Protect the ,wastewater, infrastructure from corrosion, especially from acidic ,wastewater,. 3.

Reducing Hexavalent Chromium to Trivalent Chromium with ...
Reducing Hexavalent Chromium to Trivalent Chromium with ...

Therefore, it should be removed from contaminated waters. Its redn. to ,trivalent chromium, can be beneficial because a more mobile and more toxic ,chromium, species is converted to a less mobile and less toxic form. During the last two decades, there has been important interest in using zero-valent iron (ZVI) as a Cr(VI)-reducing agent.

Reducing Hexavalent Chromium to Trivalent Chromium with ...
Reducing Hexavalent Chromium to Trivalent Chromium with ...

Therefore, it should be removed from contaminated waters. Its redn. to ,trivalent chromium, can be beneficial because a more mobile and more toxic ,chromium, species is converted to a less mobile and less toxic form. During the last two decades, there has been important interest in using zero-valent iron (ZVI) as a Cr(VI)-reducing agent.

Trivalent Chromium Ion Adsorption on Various Types of ...
Trivalent Chromium Ion Adsorption on Various Types of ...

A synthetic ,chromium, nitrate [Cr (NO 3) 3 ⋅ 9 H 2 O] solution adjusted to pH i = 3.2 at 112 mg L − 1 was used. The results revealed that CWS had the best adsorption capacity for ,chromium,, followed by SWS, and adsorption capacity of the different ,wastewater, sludges was in the following order: CWS > SWS ⩾ MWS > PWS > AWS.

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

13/8/1998, · Biosorption of ,Trivalent Chromium, from ,Wastewater,: An Approach towards Green Chemistry. Chemical Engineering & Technology 2014, 37, 1741-1750. ... Removal and Recovery of ,Chromium, from Solutions Simulating Tannery ,Wastewater, by Strong ,Acid, Cation Exchanger.

Chromium - DuPont
Chromium - DuPont

While trivalent chromium (Cr3+) is not considered to be harmful, hexavalent chromium (Cr6+) is toxic. If the chromium ion to remove from the wastewater stream is in the +3 oxidation state, then it typically behaves as a cation, so a cation exchange resin such as AmberSep™ G26 H Resin is recommended.

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