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Acidic wastewater is more or less hazardous

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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Acidic wastewater is more or less hazardous
Fluoride - Wellington Water
Fluoride - Wellington Water

Hydrofluorosilicic ,acid, (HFA), a liquid, is used at our Gear Island treatment plant. HFA has a ,fluoride content, of not less than 15% and is typically around 18%. As for SSF, the HFA we use is tested to ensure that any other chemical elements of health significance that it contains are at safe levels in relation to the Drinking Water Standards for New Zealand.

Removing Fluoride from Wafer Etching Wastewater
Removing Fluoride from Wafer Etching Wastewater

As the HF wastewater is being discharge, it contains an average of 15,000ppm of fluoride in the wastewater which is 7,500 times more than DOE Standard A Discharge Limit. This HF wastewater will go through a series of chemical treatment, particularly using conventional method (Lime) to reduce the fluoride level and increase its pH.

IS 3025-60 (2008): Methods of sampling and test (physical ...
IS 3025-60 (2008): Methods of sampling and test (physical ...

concentrated sulphuric ,acid,. Ifthe amount ofchloride in the aliquot exceeds 5 mg. add about 5 mg ofsilver sulphate for each milligram ofchlorine. Connect up the apparatusand distil 150 ml as in 5.6.2.1. Determine the ,fluoride content, ofthe total 150 mIDI'distillate as in 5.6.1.2. JOOOW ,Fluoride, (as F). mg/I = ---5.7 Calculation 5.7.1 Method without Distillation

REMOVAL OF FLUORIDE FROM WASTEWATER BY CALCINED …
REMOVAL OF FLUORIDE FROM WASTEWATER BY CALCINED …

World Health Organization (WHO) sets a 1.5 mg/L as the higher limit of fluoride content in drinking water [1]. The high concentration of fluoride leads to dental and skeletal fluorosis such as mottling of teeth, softening of bones and ossification of tendons and ligaments [2]. …

Ground Water Contamination with Fluoride and Potential ...
Ground Water Contamination with Fluoride and Potential ...

1/6/2012, · The World Health Organisation recommends that in mitigating for fluorosis in endemic areas the approach should be hierarchical in the following order; first to identify alternative source of potable water with low ,fluoride content,, secondly to dilute high ,fluoride, water with low ,fluoride, water to attain a mass balance of within 1.5 mg/l, thirdly to use high calcium, magnesium and vitamin c ...

The effectiveness of calcium hydroxide and sodium ...
The effectiveness of calcium hydroxide and sodium ...

fluoride, with calcium chloride coagulant can reduce the ,fluoride content, of 99.72% [6]. The use of Calcium Hydroxide in the area of environmental health includes ,wastewater, treatment. CaOH can be useful as a hardness-reducing agent, neutralize acidity, and minimize levels of silica, manganese, ,fluoride, and other organic

The Phosphate Fertilizer Industry: An Environmental ...
The Phosphate Fertilizer Industry: An Environmental ...

9/12/2017, · “In the manufacture of super-phosphate fertilizer, phosphate rock is acidulated with sulfuric ,acid,, and the ,fluoride content, of the rock evolves as volatile silicofluorides. In the past, much of this volatile material was vented to the atmosphere, contributing heavily to pollution of the air and land surrounding the manufacturing site.

A Limestone Reactor for Fluoride Removal from Wastewaters ...
A Limestone Reactor for Fluoride Removal from Wastewaters ...

In laboratory experiments, the ,fluoride, concentration of the effluent from feedwaters containing initial F amounts of up to 109 mg/L were brought below the MCL limit of 4 mg/L with a porewater residence time within the column of 2 h. Profile sampling shows that ,fluoride, is reduced from 109 to 8 mg/L after only 35 min within the reactor.

REMOVAL OF FLUORIDE FROM WASTEWATER BY CALCINED …
REMOVAL OF FLUORIDE FROM WASTEWATER BY CALCINED …

World Health Organization (WHO) sets a 1.5 mg/L as the higher limit of fluoride content in drinking water [1]. The high concentration of fluoride leads to dental and skeletal fluorosis such as mottling of teeth, softening of bones and ossification of tendons and ligaments [2]. In …

Combined natural and chemical coagulants to remove ...
Combined natural and chemical coagulants to remove ...

abstract = "The combined chemical and natural coagulant showed greater ,fluoride, ion removal in synthetic hydrofluoric ,acid wastewater, when compared to natural coagulant or chemical coagulant treatment alone. The impact of applying fibrous thin film on …

Fluoride - Wellington Water
Fluoride - Wellington Water

Hydrofluorosilicic ,acid, (HFA), a liquid, is used at our Gear Island treatment plant. HFA has a ,fluoride content, of not less than 15% and is typically around 18%. As for SSF, the HFA we use is tested to ensure that any other chemical elements of health significance that it contains are at safe levels in relation to the Drinking Water Standards for New Zealand.

Removal of fluoride from semiconductor wastewater by ...
Removal of fluoride from semiconductor wastewater by ...

1/3/2005, · Around 350–700 m 3 day −1 of fluoride-containing wastewater, with fluoride concentrations from 500 to 2000 mg L −1 is generated by the rinsing and cleaning operations in a typical 8-in semiconductor fabrication facility ( Huang and Liu, 1999; Chuang et al., 2002 ).

Fluoride Action Network | The Phosphate Fertilizer ...
Fluoride Action Network | The Phosphate Fertilizer ...

That’s because, after being captured in the scrubbers, the fluoride acid (hydrofluorosilicic acid), a classified hazardous waste, is barreled up and sold, unrefined, to communities across the country. Communities add hydrofluorosilicic acid to their water supplies as the primary fluoride chemical for water fluoridation.

Fluoride Removal by Clays Geomaterials Minerals Low ...
Fluoride Removal by Clays Geomaterials Minerals Low ...

purpose and ,fluoride, expulsion from ,wastewater, is the one most significant problem throughout the world. Fluorosis is ... ,content, and the acidic property of soil. ... leach more ,fluoride, whereas less ,fluoride, leach from ,acid, soil in tropical humid areas (Southern China) and in temperate

Process for removing fluoride from a wastewater and ...
Process for removing fluoride from a wastewater and ...

Abstract. This patent describes a process for removing ,fluoride, from a ,wastewater,. It involves producing hydrofluoric ,acid, from SiF{sub 6}{sup 2 {minus}}.

Minerals | Free Full-Text | Precipitation Methods Using ...
Minerals | Free Full-Text | Precipitation Methods Using ...

As shown in Figure 1a, the fluoride concentration decreasing quickly from 300 mg/L to approximately 8 mg/L and the residual fluoride ion concentration in the wastewater was hardly changed with the reaction time extending, indicating that calcite and hydrochloric acid can act quickly to release calcium ions and form precipitates with fluoride ions after hydrochloric acid was added to the wastewater.

Process for removing fluoride from a wastewater and ...
Process for removing fluoride from a wastewater and ...

Abstract. This patent describes a process for removing ,fluoride, from a ,wastewater,. It involves producing hydrofluoric ,acid, from SiF{sub 6}{sup 2 {minus}}.

The Phosphate Fertilizer Industry: An Environmental ...
The Phosphate Fertilizer Industry: An Environmental ...

9/12/2017, · “In the manufacture of super-phosphate fertilizer, phosphate rock is acidulated with sulfuric ,acid,, and the ,fluoride content, of the rock evolves as volatile silicofluorides. In the past, much of this volatile material was vented to the atmosphere, contributing heavily to pollution of the air and land surrounding the manufacturing site.

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