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When the fracturing fluid flows back

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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When the fracturing fluid flows back
Determination of chemical oxygen demand (COD) using ...
Determination of chemical oxygen demand (COD) using ...

A new method for determining ,wastewater chemical oxygen demand, (,COD,) using ultrasonic digestion and titration based on oxidation reduction potential (ORP) was developed. ,COD, values of potassium hydrogen phthalate solution obtained by ultrasonic digestion were well …

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 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 Biological Oxygen Demand (BOD) in Waste ...
Determination of Biological Oxygen Demand (BOD) in Waste ...

6.3 Immediately close the bottles when filled and there should not be any air bubble in the bottle. 6.4 Mark the bottles as blank and sample. 6.5 Incubate one sample and one blank bottle at 20 °C for 5 days. 6.6 Analyze immediately remaining one blank and one sample bottle of dissolved oxygen (DO).

Determination of chemical oxygen demand (COD) using ...
Determination of chemical oxygen demand (COD) using ...

A new method for determining ,wastewater chemical oxygen demand, (,COD,) using ultrasonic digestion and titration based on oxidation reduction potential (ORP) was developed. ,COD, values of potassium hydrogen phthalate solution obtained by ultrasonic digestion were well …

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

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 exhaustion of the dichromates during the reaction.

A Modified Method for the Accurate Determination of ...
A Modified Method for the Accurate Determination of ...

In this work, in order to find a method for the accurate determination of chemical oxygen demand (COD Cr) in high chloride oilfield wastewater, the interferences of chloridion (Cl−) on COD Cr determination were first studied based on the Chinese national standard GB 11914-89. …

Determination of Biochemical Oxygen Demand Of Wastewater
Determination of Biochemical Oxygen Demand Of Wastewater

Bio oxygen demand (B.O.D) is the amount of oxygen required for the microorganisms (bacteria) present in the waster water to convert the organic substance to stable compounds such as CO2 and H2O. Bacteria placed in contact with organic materials will utilize it as a food source in the utilization the organic material will be oxidized to CO2 H2O.

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

DETERMINATION, OF THE ,CHEMICAL OXYGEN DEMAND, (,COD,) IN WATER ISO 15705:2002 INTRODUCTION ,Chemical Oxygen Demand, (,COD,) is one of the most common integral indicators of anthropogenic pollution of water bodies. ,COD, is widely used in the analysis of natural water, to control ,wastewater, treatment from organic various substances.

Characteristics of Wastewater | Wastewater Management
Characteristics of Wastewater | Wastewater Management

(vii) ,Chemical oxygen demand, (,COD,) (viii) Bio-,chemical oxygen demand, (BOD) (ix) Stability and relative stability. (i) pH Value: The test for pH value of ,wastewater, is carried out to determine whether it- is acidic or alkaline in nature. Fresh sewage is generally alkaline in nature, (its pH value between 7.3 to 7.5).

DETERMINATION OF COD IN SPENT ACID WASTEWATER BY …
DETERMINATION OF COD IN SPENT ACID WASTEWATER BY …

the ,determination of COD, in the spent ,acid wastewater, by sealing method was researched in this paper。The experimental results showed that the nethod is economical,simple and accurate so that it can eliminate the inteference of CL-efficiently.Therefore,it can be used to determin the value ,of COD, of spent ,acid wastewater,。

DETERMINATION OF COD IN SPENT ACID WASTEWATER BY …
DETERMINATION OF COD IN SPENT ACID WASTEWATER BY …

the ,determination of COD, in the spent ,acid wastewater, by sealing method was researched in this paper。The experimental results showed that the nethod is economical,simple and accurate so that it can eliminate the inteference of CL-efficiently.Therefore,it can be used to determin the value ,of COD, of spent ,acid wastewater,。

Determination of chemical oxygen demand of nitrogenous ...
Determination of chemical oxygen demand of nitrogenous ...

and monitoring. The natural degradation of nitrogenous organic compounds (NOCs) in water requires significant amounts of oxygen. In the ,determination, of standard ,COD, however, NOCs are persistent compounds that cannot be completely oxidized even in the most oxidative chemical environments, i.e. the reaction media that contain high concentrations of dichromate in strong ,acid, at high temperature.

Determination of Trace Metals in Waste Water and Their ...
Determination of Trace Metals in Waste Water and Their ...

9/3/2012, · However, the application of untreated plant wastes as adsorbents can also bring several problems such as low adsorption capacity, high ,chemical oxygen demand, (,COD,) and biological chemical demand (BOD) as well as total organic carbon (TOC) due to release of soluble organic compounds contained in the plant materials.

Determination of the Internal Chemical Energy of Wastewater
Determination of the Internal Chemical Energy of Wastewater

In this study a new methodology of preparing samples for measuring the internal chemical energy in ,wastewater, is developed, and an analysis is made between this and the ,COD, measurements taken. The mixed ,wastewater, examined, using freeze-drying of samples to minimize loss of volatiles, had 16.8 kJ/L, while the domestic ,wastewater, tested had 7.6 kJ/L nearly 20% higher than previously estimated.

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

matter have traditionally been used to determine the relative “strength” of a wastewater sample. Today there are four common laboratory tests used to determine the gross amount of organic matter (i.e., concentrations > 1.0 mg/L) in waste-water: 1. BOD (biochemical oxygen demand) - See Page 3. 2. COD (chemical oxygen demand) - See Page 5. 3.

Characteristics of Wastewater | Wastewater Management
Characteristics of Wastewater | Wastewater Management

(vii) Chemical oxygen demand (COD) (viii) Bio-chemical oxygen demand (BOD) (ix) Stability and relative stability. (i) pH Value: The test for pH value of wastewater is carried out to determine whether it- is acidic or alkaline in nature. Fresh sewage is generally alkaline in nature, (its pH value between 7.3 to 7.5).

Determination of the Internal Chemical Energy of Wastewater
Determination of the Internal Chemical Energy of Wastewater

In this study a new methodology of preparing samples for measuring the internal chemical energy in ,wastewater, is developed, and an analysis is made between this and the ,COD, measurements taken. The mixed ,wastewater, examined, using freeze-drying of samples to minimize loss of volatiles, had 16.8 kJ/L, while the domestic ,wastewater, tested had 7.6 kJ/L nearly 20% higher than previously estimated.

A Modified Method for the Accurate Determination of ...
A Modified Method for the Accurate Determination of ...

More specifically, when the concentration of K 2 Cr 2 O 7 was 0.025 mol・L −1, the interferences of Cl − on COD Cr determination were the slightest. Therefore, the optimum concentration of K 2 Cr 2 O 7 in this study was identified as 0.025 mol・L −1 for the determination of …

New BOD determination for industrial wastewater plant
New BOD determination for industrial wastewater plant

Its patented photo-electrochemical ,COD, analysis uses a nanotechnology based approach to oxidize soluble organics in the sample in situ. PeCOD eliminates the use of harmful chemicals. It generates results in 15 minutes through the use of UV activated TiO 2 (titanium dioxide) oxidation and an internal electrode, by directly measuring electron transfer.

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