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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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Nitrite interference and elimination in diphenylcarbazide ...
Nitrite interference and elimination in diphenylcarbazide ...

Sulfamic acid had been used to enhance the efficiency of high-concentration nitrite-containing wastewater by microwave treatment process (Li et al. 2010), and remove nitrite for accurate determination of nitrate or chemical oxygen demand (COD) (Marouf-Khelifa et al. 2006).

Understanding Laboratory Wastewater Tests: I. ORGANICS ...
Understanding Laboratory Wastewater Tests: I. ORGANICS ...

14/10/2010, · The COD test uses a chemical (potassium dichromate in a 50% sulfuric acid solution) that “oxidizes” both organic (predominate) and inorganic substances in a wastewater sample, which results in a higher COD concentration than BOD concentration for the same wastewater sample since only organic compounds are consumed during BOD testing.

The Science of CHEMICAL OXYGEN DEMAND
The Science of CHEMICAL OXYGEN DEMAND

oxalic acid, and will thus have a much greater effect on the dissolved oxygen content of a receiving water. COD Test The Chemical Oxygen Demand (COD) test uses a strong chemical oxidant in an acid solution and heat to oxidize organic carbon to CO 2 and H 2 O. By definition, chemical oxygen demand is “a measure of the oxygen equivalent

Wastewater COD - How to Use Chemical Reactions to ...
Wastewater COD - How to Use Chemical Reactions to ...

In a solution with a strength of 50 % of sulphuric ,acid, (H2SO4), potassium ... The ferroin indicator is an important element in the ,determination, of ,wastewater cod, as the change in color to reddish-brown from bluish green indicates the ... (Hg2Cl2). The formation of this mercurous chloride prevents the ,interference, of other substances in ...

(PDF) A new approach for chemical oxygen demand (COD ...
(PDF) A new approach for chemical oxygen demand (COD ...

In addition to the Pretreatment and biotreatment of saline industrial ,wastewater,. increase in mercury sulphate addition, the strength of the Water Sci Technol 53(3):17–25 Vyrides I, Stuckey DC (2009) A modified method for the digestion solution may be decreased for more precise ,COD determination of chemical oxygen demand, (,COD,) for samples measurements especially for the samples containing low …

Exp 1 Chemical Oxygen Demand - Civil Engineers PK
Exp 1 Chemical Oxygen Demand - Civil Engineers PK

Chemical oxygen demand (COD) is a measure of the capacity of water to consume oxygen during the decomposition of organic matter and the oxidation of inorganic chemicals such as ammonia and nitrite. COD measurements are commonly made on samples of waste waters or of natural waters contaminated by domestic or industrial wastes.

Determination of the chemical oxygen demand (COD) in water ...
Determination of the chemical oxygen demand (COD) in water ...

COD, is widely used in the analysis of natural water, to control ,wastewater, treatment from organic various substances. Lumex Instruments provides the method and equipment (FLUORAT-02 analyzer and TERMION thermoreactor) for accurate, easy-to-use and cost-effective ,COD determination, using the small-scale sealed tube method (ST-,COD,).

DETERMINATION OF CHEMICAL OXYGEN DEMAND COD
DETERMINATION OF CHEMICAL OXYGEN DEMAND COD

Chemical oxygen demand, does not differentiate between biologically available and inert organic matter, and it is a measure of the total quantity of oxygen required to oxidize all organic material into carbon dioxide and water. ,COD, values are always greater than BOD values. For domestic and some industrial ,wastewater COD, is about 2.5 times BOD.

COD determination: Removing Cl Interference in StSeawaters
COD determination: Removing Cl Interference in StSeawaters

A) ,Interference, elimination Chloride-OLD PROCEDURE ISO 15705: 2002 ,Determination, of the ,chemical oxygen demand, index (ST‐,COD,) – small‐scalesealed‐tubemethod ISO small sealed‐tube method. The most frequent procedure to remove Cl‐with a maximum weight ratio 10:1, HgSO 4 + 2 2Cl‐→ HgCl 2 + SO 4 ‐(3) scale 2

(PDF) A new approach for chemical oxygen demand (COD ...
(PDF) A new approach for chemical oxygen demand (COD ...

In addition to the Pretreatment and biotreatment of saline industrial ,wastewater,. increase in mercury sulphate addition, the strength of the Water Sci Technol 53(3):17–25 Vyrides I, Stuckey DC (2009) A modified method for the digestion solution may be decreased for more precise ,COD determination of chemical oxygen demand, (,COD,) for samples measurements especially for the samples containing …

Wastewater COD - How to Use Chemical Reactions to ...
Wastewater COD - How to Use Chemical Reactions to ...

In a solution with a strength of 50 % of sulphuric ,acid, (H2SO4), potassium ... The ferroin indicator is an important element in the ,determination, of ,wastewater cod, as the change in color to reddish-brown from bluish green indicates the ... (Hg2Cl2). The formation of this mercurous chloride prevents the ,interference, of other substances in ...

An economical approach to quick safe and accurate COD ...
An economical approach to quick safe and accurate COD ...

Measuring chemical oxygen demand (COD) is one of the most frequently performed tests for assessing water quality. The test is widely applied in municipal wastewater facilities and industrial wastewater treatment plants to determine the degree of organic contamination in water, and to evaluate the efficiency of treatment processes.

COD determination: Removing Cl Interference in StSeawaters
COD determination: Removing Cl Interference in StSeawaters

A) ,Interference, elimination Chloride-OLD PROCEDURE ISO 15705: 2002 ,Determination, of the ,chemical oxygen demand, index (ST‐,COD,) – small‐scalesealed‐tubemethod ISO small sealed‐tube method. The most frequent procedure to remove Cl‐with a maximum …

The Science of CHEMICAL OXYGEN DEMAND
The Science of CHEMICAL OXYGEN DEMAND

oxalic acid, and will thus have a much greater effect on the dissolved oxygen content of a receiving water. COD Test The Chemical Oxygen Demand (COD) test uses a strong chemical oxidant in an acid solution and heat to oxidize organic carbon to CO 2 and H 2 O. By definition, chemical oxygen demand is “a measure of the oxygen equivalent

Determination of the chemical oxygen demand (COD) in water ...
Determination of the chemical oxygen demand (COD) in water ...

COD, is widely used in the analysis of natural water, to control ,wastewater, treatment from organic various substances. Lumex Instruments provides the method and equipment (FLUORAT-02 analyzer and TERMION thermoreactor) for accurate, easy-to-use and cost-effective ,COD determination, using the small-scale sealed tube method (ST-,COD,).

An economical approach to quick safe and accurate COD ...
An economical approach to quick safe and accurate COD ...

Measuring chemical oxygen demand (COD) is one of the most frequently performed tests for assessing water quality. The test is widely applied in municipal wastewater facilities and industrial wastewater treatment plants to determine the degree of organic contamination in water, and to evaluate the efficiency of treatment processes.

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