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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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hydraulic fracking to extract oil and natural gas resources include
Removal of Manganese(II) from Acid Mine Wastewater: A ...
Removal of Manganese(II) from Acid Mine Wastewater: A ...

However, the removal of 16.5 mg/L Mn (II) from acidic mining wastewaters was difficult and required an initial pH value of 8.0 and a larger limestone dose (16.7 g/L), probably due to the adverse effect of calcium (Ca) sulfate coating on the limestone [ 43 ].

Explain and describe using a balanced chemical equation ...
Explain and describe using a balanced chemical equation ...

Limestone, is primarily composed of calcium carbonate. This is the calcium salt compound of the carbonate anion, which is a weak diprotic base. A Bronsted ,acid,-base reaction will occur.

Carbonate Crystals Precipitated by Freshwater Bacteria and ...
Carbonate Crystals Precipitated by Freshwater Bacteria and ...

15/9/2009, · Bacterial carbonate precipitation is known to be a natural ,phenomenon, associated with a wide range of bacterial species. Recently, the ability of bacteria to produce carbonates has been studied for its value in the conservation of ,limestone, monuments and concrete.

EFFECT OF NITRITE ON DENITRIFICATION OF WASTEWATER
EFFECT OF NITRITE ON DENITRIFICATION OF WASTEWATER

phenomenon, is called methemoglobinemia (blue baby syndrome). ... However, for example, nitric-acid rinsing process ,wastewater,, nitrate-contaminated ground water and nitrified landfill leachate have low organic ... denitrification with sulfur and ,limestone, packed

Simultaneous removal of Fe(II) and Mn(II) from acid mine ...
Simultaneous removal of Fe(II) and Mn(II) from acid mine ...

1/11/2020, · The treatment effect of actual ,wastewater, was slightly inferior to model ,wastewater,. This ,phenomenon, may be caused by competition among the amounts of other ions, such as SO 4 2−, CO 3 2−, HCO 3-, HPO 4 - may result in the precipitation of Ca 2+ in the ,wastewater, that leads passivate of the electrode, and ·OH generated also could be captured by these anions (Ahmadzadeh and Dolatabadi, …

Carbonate Crystals Precipitated by Freshwater Bacteria and ...
Carbonate Crystals Precipitated by Freshwater Bacteria and ...

Bacterial ,carbonate, precipitation is known to be a natural ,phenomenon, associated with a wide range of bacterial species. Recently, the ability of bacteria to produce carbonates has been studied for its value in the conservation of ,limestone, monuments and concrete.

Acid-enhanced limestone defluoridation in column reactor ...
Acid-enhanced limestone defluoridation in column reactor ...

Acid enhanced limestone defluoridation of water has been studied in a crushed limestone column reactor using oxalic acid (OA).

Calcium Aluminate Technology and Biogenic Corrosion ...
Calcium Aluminate Technology and Biogenic Corrosion ...

The byproduct of the bacteria’s digestion process is sulfuric acid. It is this sulfuric acid that is corrosive to ,wastewater, structures, not the H2S gas itself. Factors that can enhance this biogenic corrosion cycle include long retention times, high ambient temperatures, flat terrain, and low flow values.

Adsorption of Anionic Surfactant Presence in Synthetic Car ...
Adsorption of Anionic Surfactant Presence in Synthetic Car ...

19]. This ,phenomenon, was a setback for the oil production industry. However, for the ,wastewater, treatment industry, this occurrence provides idea for the usage of LS in adsorbing AS. ,Limestone, is a widely available sedimentary rock, which composed of minerals calcite and aragonite with a different crystal forms of calcium carbonate (CaCO3).

Removal of Manganese(II) from Acid Mine Wastewater: A ...
Removal of Manganese(II) from Acid Mine Wastewater: A ...

Acid, mine drainage 3.71 ,Limestone, 2.94 10.0 Room temperature 6 h 93% [42] Artificial solution 155 ,Limestone, 8.3 9.0 23 90 min 99.4% [43] Mine water 16.5 ,Limestone, 16.7 9.0 23 90 min 98.2% [44] Hydroxide precipitation employs pH adjustment to convert heavy …

Impact of Virus Aggregation on Inactivation by Peracetic ...
Impact of Virus Aggregation on Inactivation by Peracetic ...

Abstract. Viruses in ,wastewater, and natural environments are often present as aggregates. The disinfectant dose required for their inactivation, however, is typically determined with dispersed viruses. This study investigates how aggregation affects virus inactivation by chemical disinfectants.

EFFECT OF NITRITE ON DENITRIFICATION OF WASTEWATER
EFFECT OF NITRITE ON DENITRIFICATION OF WASTEWATER

phenomenon, is called methemoglobinemia (blue baby syndrome). ... However, for example, nitric-,acid, rinsing process ,wastewater,, nitrate-contaminated ground water and nitrified landfill leachate have low organic ... denitrification with sulfur ,and limestone, packed

Acid rain - Wikipedia
Acid rain - Wikipedia

Acid rain can damage buildings, historic monuments, and statues, especially those made of rocks, such as limestone and marble, that contain large amounts of calcium carbonate. Acids in the rain react with the calcium compounds in the stones to create gypsum, which then flakes off.

Role of indigenous iron in improving sludge dewaterability ...
Role of indigenous iron in improving sludge dewaterability ...

After the conditioning, the acidic filtrate of the conditioned WAS also needs to be neutralised. A lot of methods have been developed to neutralize the acidic wastewater before discharge. The traditional methods were mainly based on limestone addition.

Removal of Heavy Metals from Acid Mine Drainage: A Review
Removal of Heavy Metals from Acid Mine Drainage: A Review

Fe and Mn by different materials likes concrete, sand, ,limestone,, starfish, and black shale from ,Wastewater, impacted by ,acid, mine drainage. The change in pH, Eh, and EC as a function of time was quantified and found high Neutralization efficiency for AMD and maintained the pH value above11[7].

SEMI-BATCH PRECIPITATION OF CALCIUM SULFATE DIHYDRATE …
SEMI-BATCH PRECIPITATION OF CALCIUM SULFATE DIHYDRATE …

the ,acid,’s initial concentration, the stronger this ,phenomenon,. This could possibly explain the increasing discrepancy between the mean particle sizes of the two populations as initial ,acid, concentration decreases (Table 5). Table 5: Mean particle size (µm) of gypsum crystals precipitated at 90°C with various propeller’s

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