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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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acid fracturing waste water up-to-standard emission treatment near me craigslist
Understanding the Basics of Industrial Effluent Treatment ...
Understanding the Basics of Industrial Effluent Treatment ...

7/3/2017, · As a reminder, the scale runs from 0 (very strong ,acid,) to 14 (very strong ,alkali,). A pH of 7 indicates a solution is neutral, neither acidic nor alkaline. The most common requirement for discharging treated effluent to the environment is that it must be neither too acidic nor too alkaline.

Modified APHA closed-tube reflux colorimetric method for ...
Modified APHA closed-tube reflux colorimetric method for ...

The method was applied for the UV-Vis spectrometry ,determination of COD, in water and ,wastewater,. ... D. G., & Pause, R. W. (1976). An improved ,determination of chemical oxygen demand, in water and wastes by a simplified ,acid, ... Elimination of chloride ,interference, in the ,chemical oxygen demand, test. Analytical Chemistry, 35, 1064–1067 ...

Total Kjeldahl Nitrogen in Water and Biosolids by ...
Total Kjeldahl Nitrogen in Water and Biosolids by ...

This method describes procedures for the ,determination, of total kjeldahl nitrogen (TKN) and/or organic nitrogen in drinking, ground, ... captured in a dilute sulfuric ,acid, solution. ... per 3000 mg ,COD, will prevent this ,interference,. Monitor digestion temperature and pH if this correction is used. 4.4.

WasteWater System: Treatment Options for Biodiesel Wastewater
WasteWater System: Treatment Options for Biodiesel Wastewater

Since ,alkali, is used as a catalyst to speed up the reaction process, the characteristics of the biodiesel ,wastewater, is also expected to be very high in pH reaching almost 11 most of the time and thus, this would require pre-treatment step to bring down the pH close to neutral zone before the ,wastewater, can be treated using bacterial biodegradation.

Wastewater treatment in the fishery industry - 2 ...
Wastewater treatment in the fishery industry - 2 ...

A common ,interference, factor in the ,COD, test is the presence of chlorides. If seawater is used at some point in the processing or salt brines are used for some "curing" operations, chlorides will most probably appear in the ,wastewater, causing ,interference, while they are oxidized by the dichromate: Cl-+ Cr 2 O 7 2-+ 14H + 3 Cl 2 + 2Cr 3+ + 7H 2 O

Industrial Wastewater Neutralization Systems | W2 Systems
Industrial Wastewater Neutralization Systems | W2 Systems

Fully Customizable System. W2 Systems ,wastewater, neutralization systems are designed ,to treat, influent ,wastewater, with pH from 0.1 to 13.99 pH units. Standard neutralization systems can ,treat, up to 90 GPM with 48 minutes of retention. W2 has over twenty neutralization system installations including at: …

A review of treating oily wastewater - ScienceDirect
A review of treating oily wastewater - ScienceDirect

1/5/2017, · Cong et al. (2011) applied, poly-aluminum zinc silicate chloride, to treat oily wastewater. The best flocculation condition is determined as the optimal dosage is 35 mL, the most suitable range of pH is 7–8, and the best mole ratio of zinc, aluminum and silicon is 1:1:2.

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 …

Chemical Oxygen Demand - hannasingapore.com
Chemical Oxygen Demand - hannasingapore.com

COD, test uses a strong oxidant, potassium dichromate (k 2 Cr 2 O 7), to fully oxidize the organic molecules in a sample into carbon dioxide (CO 2) and water.Dichromate readily gives up oxygen (O 2) to bond with carbon atoms to create carbon dioxide.In the process the potassium dichromate is reduced from the hexavalent (C +6) state in the dichromate to the trivalent (Cr +3) state.

Research of acid mine wastewater treatment technology
Research of acid mine wastewater treatment technology

better method ,to treat wastewater, and the process is shown in figure 2. First of all, add lime adjust pH of 4.0 to precipitate Fe 3+, because Fe 3+ in sewage is the optimal, it is no need to set oxidation process to transform Fe 2+ to Fe 3+;Then, put solution into sewage to make copper precipitate in the form of

The CHEMetrics COD System
The CHEMetrics COD System

Chemical Oxygen Demand, (,COD,) Methods The ,determination of Chemical Oxygen Demand, (,COD,) is widely used in munic-ipal and industrial laboratories to measure the overall level of organic contamination in ,wastewater,. The con-tamination level is determined by measuring the equiv-alent amount of oxygen required to oxidize organic matter in the sample.

Is it possible that pH of wastewater can reach 8.5 even 9 ...
Is it possible that pH of wastewater can reach 8.5 even 9 ...

The, wastewater, has a high concentration of organic, acids, and, alkalinity., As the acids are converted to methane and CO 2 losing their acid effect the effect of the high, alkalinity, of the water...

Alkali - an overview | ScienceDirect Topics
Alkali - an overview | ScienceDirect Topics

Carbonate washing, is a mild alkali process for emission control by the removal of acid gases (such as carbon dioxide and hydrogen sulfide) from gas streams (Speight, 2014, 2017) and uses the principle that the rate of absorption of carbon dioxide by potassium carbonate increases with temperature.

A method for removing persulfate interference in the ...
A method for removing persulfate interference in the ...

In recent years, sulfate radical-based advanced oxidation has received increasing attention for the treatment of water and ,wastewater,. However, the ,chemical oxygen demand, (,COD,), a common measure of gross organic contamination, is subject to ,interference, from residual persulfate in the treated water. In this study, a new method, based on addition of sodium sulfite (Na2SO3) and heating, has been ...

Treatment and Utilization of Chemical Wastewater In Power ...
Treatment and Utilization of Chemical Wastewater In Power ...

20/2/2020, · The characteristic of this kind of ,wastewater, is that the pH value does not meet the discharge or reuse requirements, and the main component of the ,wastewater, is inorganic salt, such as chloride ion, etc. the discharge amount of this kind of ,wastewater, is relatively small. The ,acid, and ,alkali wastewater, is discharged to the ,acid, and ,alkali wastewater, pond through the waste liquid drainage ditch, and the pH value is adjusted by adding ,acid, and ,alkali, …

Don't be so caustic | IER News
Don't be so caustic | IER News

The ,best, way to neutralize ,acid, in ,wastewater, is to dose with an ,alkali, to maintain a neutral pH level. The traditional method ,to treat, acidic ,wastewater, involves the use of caustic soda, otherwise known as sodium hydroxide (NaOH). Other widely used alkalis are soda ash (sodium carbonate) or hydrated lime (calcium hydroxide).

Dichromate Reflux Method for Determination of Oxygen ...
Dichromate Reflux Method for Determination of Oxygen ...

Rapid method for ,determination of chemical oxygen demand,. Analytical Chemistry 1967, 39 (2) , ... (II) and Zn(II) from industrial ,wastewater, by ,acid,-activated montmorillonite-illite type of clay. Comptes Rendus Chimie 2010, 13 (11) , ... Reduction of chloride ion ,interference, in ,chemical oxygen demand, (,COD,…

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