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When the wastewater is acidic

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 wastewater is acidic
Removal of sulfur compounds from wastewater - Nederlandse ...
Removal of sulfur compounds from wastewater - Nederlandse ...

The invention relates to a process for ,removal of sulfur compounds from wastewater,, which process provides recovery of elemental sulfur. The process is carried out in two separate anaerobic reactors. In the first reactor organic compounds are converted to ,acid, compounds and sulfur compounds are converted to ,sulfide, compounds.

Lignin recovery from spent alkaline pulping liquors using ...
Lignin recovery from spent alkaline pulping liquors using ...

The reduction in CO2 consumption can be explained by the fact that oxidation ,of sulfide, to sulfate and organics (e.g. sugars) to organic acids (e.g. sugar acids) consumes residual ,alkali, in black ,liquor,. The reduction in sulfuric ,acid, consumption can be explained by the improved dewatering of the cake that occurs during lignin slurry filtration.

US6709592B2 - Removal of sulfur compounds from wastewater ...
US6709592B2 - Removal of sulfur compounds from wastewater ...

During this absorption process sulfide is, converted, to elemental sulfur, while Fe(III), is reduced to, Fe(II)., Fe(II,) is reoxidized, to Fe(III,) by air in a separate aerator. This known process is...

Sulfite Pulping - an overview | ScienceDirect Topics
Sulfite Pulping - an overview | ScienceDirect Topics

Sulfite Pulping. The sulfite pulping liquid is prepared by absorbing sulfur dioxide (prepared by burning sulfur with a controlled excess of oxygen and quickly cooling the product gas to around 200°C to prevent further oxidation to sulfur trioxide) into different bases. The reactions are: (1) SO 2 + H 2 O → H 2 SO 3.

Environmental Biotechnology: Meaning Applications and ...
Environmental Biotechnology: Meaning Applications and ...

A treatment plant at the Homestake ,Mine, in Lead, South Dakota, purifies 4 million gallons of cyanide-containing ,wastewater, a day by completely converting cyanide to nitrate. Pseudomonas sp. convert cyanide and thiocyanate to ammonia and bicarbonate and the nitrifying bacteria Nitrosomonas and Nitrobacter cooperate in converting ammonia to nitrate.

Detailed Modeling of Kraft Pulping Chemistry ...
Detailed Modeling of Kraft Pulping Chemistry ...

Addnl., at high ,alkali, compared to moderate ,alkali, concn., lower amts. of low mol. wt. carboxylic acids originating from the degrdn. of carbohydrates were detected in spent black ,liquor,. The presence of AQ provided significant hemicellulose stabilization against endwise degrdn. reactions, being more pronounced at moderate 0.50 M concn. than at 1.55 M hydroxyl ion concn.

Detection Control and Correction of Hydrogen Sulfide ...
Detection Control and Correction of Hydrogen Sulfide ...

Sulfide, can still be produced within the slime layer, but if dissolved oxygen is present, ,sulfide, will be oxidized as it passes into an aerobic environment If dissolved oxygen is not present, dissolved ,sulfide, will enter the bulk ,wastewater, where it can be present as dissolved hydrogen ,sulfide, gas (H2S).

Biological and Chemical Wastewater Treatment Processes ...
Biological and Chemical Wastewater Treatment Processes ...

2/12/2014, · Mixed ,liquor, is a mixture of raw ,wastewater, and activated sludge in an aeration tank. MLSS consists mainly of microorganisms and non-biodegradable suspended solids. MLSS is the effective and active portion of the activated sludge process that ensures that there is adequate quantity of viable biomass available to degrade the supplied quantity of organic pollutants at any time.

Dimethyl Sulfide - an overview | ScienceDirect Topics
Dimethyl Sulfide - an overview | ScienceDirect Topics

The mechanism of the ,acid, rain etching of acrylic-melamine coating has been described as follows. 340 Sulfuric ,acid, in rainwater is concentrated to about 70 wt% and permeates into the coatings. 340 The diffusion of sulfuric ,acid, does not follow Fick's law, and the permeation is controlled by the hydrolysis of the crosslinks. 340 The hydrolysis produces water-insoluble melamine derivatives. 340 The derivatives are extracted by the concentrated sulfuric ,acid,…

(PDF) Treatment of Sulfide Alkali Waste Waters from ...
(PDF) Treatment of Sulfide Alkali Waste Waters from ...

Treatment of ,Sulfide Alkali, Waste Waters from Mercaptans Using Distillation. July 2018; Theoretical Foundations of Chemical Engineering 52(4):673-676

The Relevance of Phosphorus and Iron Chemistry to the ...
The Relevance of Phosphorus and Iron Chemistry to the ...

Recent studies demonstrated the practical potential of multiple beneficial reuse of ferric-rich drinking water sludge (ferric DWS) for ,sulfide, and phosphate removal in ,wastewater, applications.

Kraft process - Wikipedia
Kraft process - Wikipedia

The kraft process is a process for conversion of wood into wood pulp, which consists of almost pure cellulose fibers, the main component of paper. The kraft process entails treatment of wood chips with a hot mixture of water, sodium hydroxide, and sodium ,sulfide,, known as white ,liquor,, that breaks the bonds that link lignin, hemicellulose, and cellulose. The technology entails several steps, both …

Combustion properties of mixed black liquor solids from ...
Combustion properties of mixed black liquor solids from ...

(3) Char burning: If the particle swells well, its combustion time is short, and its combustion efficiency is high. Thus, ,alkali, and energy recovery of the furnace can be improved. (4) Smelt coalescence: In this step, solids such as sodium carbonate compounds and sodium sulfate melt. Sodium sulfate is reduced to ,sulfide, …

Device for recovering sodium chemicals from green liquor ...
Device for recovering sodium chemicals from green liquor ...

The invention relates to a method ,for recovering sodium chemicals from green liquor, by precarbonating green ,liquor, by means of flue gases, by bringing a precarbonated solution into contact with a sodium bicarbonate solution and by stripping hydrogen sulphide from the so obtained ,reaction, mixture by means of steam, for producing hydrogen sulphide gas and a sodium carbonate solution, …

Pollution – Just Facts
Pollution – Just Facts

formic ,acid, accounts for 30–50% of the summertime rainwater acidity “over much of the U.S.” formic ,acid, accounts for 60–80% of rainwater acidity over the Amazon. 90% of atmospheric formic ,acid, is emitted by natural sources (primarily forests).

White liquor oxidation - Valmet
White liquor oxidation - Valmet

Primarily, partial oxidation takes place and the ,sulfide, is converted into thiosulfate. The cost of operation is low as atmospheric air is used to supply the required oxygen. This process is highly suitable if the main target is the elimination of ,sulfide,. ,Sulfide, conversion to thiosulfate: 97-98 %.

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