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gas testing waste water up-to-standard emission treatment centers near

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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gas testing waste water up-to-standard emission treatment centers near
Acid and alkali extraction of trivalent chromium from ...
Acid and alkali extraction of trivalent chromium from ...

Acid, and ,alkali extraction of trivalent chromium, 49 Kajitvichyanukul, P., et al. onto the hot plate. A condenser was used to keep the ,acid, or alkali concentration constant by condensing the water vapor back into the vessel. Strong agitation was maintained to prevent particle agglomeration. No samples were taken during the reaction period.

REMOVAL OF CHROMIUM(VI) FROM WASTEWATER USING CITRIC ACID …
REMOVAL OF CHROMIUM(VI) FROM WASTEWATER USING CITRIC ACID …

Chromium, exists in two oxidation states as Cr(III) and Cr(VI). The hexavalent form is 500 times more toxic than the ,trivalent, one.24 Human toxicity includes lung cancer, as well as kidney, liver, and gastric damage.25-26 The tanning process The maximum of Cr(VI) levels permitted in ,wastewater, are 5 mg L-1 for ,trivalent chromium, and 0.05 . mg L-1

Tannery Wastes: Trivalent Chromium Case
Tannery Wastes: Trivalent Chromium Case

year of tannery ,wastewater, are generated (Kowalski 1994). In the absence of effluent treatment, ,Chromium, concentration in tanning yard waste streams ranges from 1700-2500 mg/l (Ramasami 1996; Sreeram and Ramasami 2003). In Morocco, tannery effluents contain about 500 mg/l of ,chromium, (Dahbi et al. 2002). ,Trivalent chromium, is the

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.

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