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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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hazardous liquid waste disposal companies
Wastewater Treatment: Chemical Precipitation | Sewage ...
Wastewater Treatment: Chemical Precipitation | Sewage ...

Chromium, Ferrous sulfate is reducing agent Ferrous iron reacts with hexavalent ,chromium, reducing it to trivalent state while getting itself oxidized to ferric state Occurs rapidly at 3.0 pH for pH adjustment ,acid, is added For complete reduction excess dose of 2.5 times to theoretical dose of ferrous sulfate is added

chrome plating wastewater treatment
chrome plating wastewater treatment

The ,wastewater treatment, system is running at a flow rate of 56 gpm. Ferrous iron (,Fe, 2+ ) from the ,acid, pickling bath is used to reduce Cr (VI) to Cr (III). Lime slurry is added to raise the pH and precipitate metal hydroxides and a flocculent is introduced to enhance sedimentation in the clarifier.

chrome plating wastewater treatment
chrome plating wastewater treatment

The ,wastewater treatment, system is running at a flow rate of 56 gpm. Ferrous iron (,Fe, 2+ ) from the ,acid, pickling bath is used to reduce Cr (VI) to Cr (III). Lime slurry is added to raise the pH and precipitate metal hydroxides and a flocculent is introduced to enhance sedimentation in the clarifier.

TREATMENT OF WASTEWATER FROM CHROME PLATING …
TREATMENT OF WASTEWATER FROM CHROME PLATING …

Removal of ,chromium,(VI) and recovery of Chromic ,acid, from chrome plating industry ,wastewater, by ion exchange process is challenging. All the constituents of the plating baths contribute to the ,wastewater, stream either through part drag-out, batch dump or floor spill. Chrome plating baths may contain Cu, Ni, …

WASTEWATER TREATMENT - The Sigma Group
WASTEWATER TREATMENT - The Sigma Group

Chromium, Reduction • Hexavalent ,chromium, Cr+6 (orange or yellow) – Used for plating chrome, chrome conversion coating and etching with chromic ,acid, – Extremely toxic – Increasing low discharge limits – Prefers to pick up O-2 and form chromates which act like an anion and will not precipitate out as a metal hydroxide CrO 3 + OH- Cr(OH) 6

Simultaneous photocatalytic redox removal of chromium(vi ...
Simultaneous photocatalytic redox removal of chromium(vi ...

The coexistence of multiple-component contaminants, such as Cr(VI) and As(III) in ,acid, mine drainage, brings more difficulties in the ,wastewater treatment,.This study developed a novel strategy for simultaneous redox conversion and removal of Cr(VI) and As(III) in solution.By employing iron oxide encapsulated in a hydrothermal carbon sphere (HCS@,Fe, 3 O 4), the synergistic photocatalytic ...

Electroplating wastewater treatment - chemical methods ...
Electroplating wastewater treatment - chemical methods ...

The electromagnetic nano-mill AVS-100 (laboratory scale) was used in electroplating plant wastewater treatment from heavy metals. The reducing agent used was iron sulfate FeSO4 that reduced hexavalent chromium into trivalent chromium, with introduction of lime milk Ca(OH)2.

Effective parameters for the adsorption of chromium(III ...
Effective parameters for the adsorption of chromium(III ...

(Badruddoza et al. 2013); ,treatment, of ,wastewater by Fe, 3O 4 nanoparticles (Shen et al. 2009); and Pb(II) removal from ,wastewater, by magnetic nanoparticles of iron oxide (Nassar 2010). ,Chromium, is a transition element of VI B periodic table. ,Chromium, sulfate can be mentioned as one of the most important and common chromic compounds (Mortimer 1986).

Research on Treating Acid Wastewater Containing Heavy Metal
Research on Treating Acid Wastewater Containing Heavy Metal

Biological treatment of Cr (VI) contaminated waters was performed in fixed bed reactors inoculated with SRB growing on ethanol. At steady state the column inoculated with SRB removed 65 5% of sulfate and 95 5% of chromium. wastewater need to be treated before discharged. U (VI) can [11]. A new reduction-regeneration circulation

Treating Metal Finishing Wastewater
Treating Metal Finishing Wastewater

hazardous material of equal volume or weight. The overall cost of ,wastewater treatment, includes both the cost of treating the water and the disposal of waste. For example, a facility in Michigan generates 2,000 gallons of ,chromium, laden ,wastewater, daily.

Chromium (Cr) and water - Water Treatment and Purification
Chromium (Cr) and water - Water Treatment and Purification

Chromium, compounds are applied as pigments, and 90% of the leather is tanned by means of ,chromium, compounds. ,Wastewater, usually contains about 5 ppm of ,chromium,. ,Chromium, may be applied as a catalyser, in wood impregnation, in audio and video production and in lasers. Chromite is the starting product for inflammable material and chemical ...

Wastewater Treatment in Textile Tanneries and ...
Wastewater Treatment in Textile Tanneries and ...

Wastewater treatment, consists of applying known technology to improve or upgrade the quality of a ,wastewater,. Usually ,wastewater treatment, will involve collecting the ,wastewater, in a central, segregated location (the ,Wastewater Treatment, Plant) and subjecting the ,wastewater, to various ,treatment, processes. Most often, since

Wastewater treatment from the biodiesel production using ...
Wastewater treatment from the biodiesel production using ...

This study focused on the ,treatment, of biodiesel ,wastewater, by the EC process using Al and ,Fe, electrodes to remove COD, oil & grease, total phosphorus, orthophosphate and TSS from ,wastewater,. For this purpose, laboratory experiments were performed using the CCD for the optimization of process parameters including current density, initial pH and electrolysis time, and RSM was used for the …

(PDF) Photocatalytic treatment of industrial wastewater ...
(PDF) Photocatalytic treatment of industrial wastewater ...

The study, depicted in Figs. 4 and 5, reveals maximum ,treatment, efficiency of total ,chromium, reduction with citric ,acid,, 24.84% and increasing H 2 O 2 concentration up to 20-100 ml/l to reduce 15.12%, 32.64%, 40.57%, 58.70%, and 61.03%, that is more efficient than the H 2 O 2 /UV process.

Chromium (Cr) and water - Water Treatment and Purification
Chromium (Cr) and water - Water Treatment and Purification

Chromium, compounds are applied as pigments, and 90% of the leather is tanned by means of ,chromium, compounds. ,Wastewater, usually contains about 5 ppm of ,chromium,. ,Chromium, may be applied as a catalyser, in wood impregnation, in audio and video production and in lasers. Chromite is the starting product for inflammable material and chemical ...

Metal Finishing Wastewater Treatment Overview
Metal Finishing Wastewater Treatment Overview

Wastewater Treatment, Presented by: David Calnan & CCI- A Chemical Corporation . Metal Finishing ,Wastewater Treatment, ... (,Fe,, Al, Ca, Mg) are added, in a specific pH range, to form insoluble precipitate ... – Hexavalent ,chromium, and metal-cyanides require pre-,treatment,. – pH range, ...

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