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Causes of yellowing of treated 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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Causes of yellowing of treated acid wastewater
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.

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.

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.

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.

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