Physico-chemical technology of highly toxic cyanide industrial wastewater treatment research – industrial waste water – water industries

Abstract: The physico-chemical treatment technology in the field of handling hazardous cyanide waste disposal industry Sewage Application Ô; ¬; managers and engineering examples, clearly the physical and chemical techniques?? Chlorine oxidation of the features and advantages. Introduced the current foreign hazardous waste disposal in the area of the characteristics of cyanide treatment, and compared our present situation in the field, proving that chlorine oxidation is the most appropriate technical condition of our country. Physico-chemical technology treatment of industrial wastewater containing cyanide on Energy Saving, environmental protection is of great significance, prospects of the physico-chemical treatment of sewage containing cyanide technology research and popularization of the technology in the field of hazardous waste disposal far-reaching impact.

Keywords: energy conservation cyanide effluent chlorine oxidation Embodied

I. Introduction As China’s rapid economic development, industrial production technology continue to enhance the industrial hazardous waste output increased rapidly, variety and complexity, and the number of widely distributed generation source. According to “National Hazardous Waste List” in the industrial production of cyanide produced in the process of sewage is harmful to the human environment and human health is one of important sources, such as the effective disposal of non-random emissions, not only on the water environment, air environment and the serious impact on soil environment and destruction, but also the safety and health of the person poses a direct threat. Therefore, the in-depth study of highly toxic cyanide waste water treatment technology has become essential. Physical and chemical techniques?? Chlorine oxidation as a method of cyanide waste water disposal, hazardous waste disposal areas in China have broad applicability.

Second, analysis of physical and chemical technology

1, an overview of industrial sludge containing cyanide

Cyanide refers to the molecule containing cyano [-C N] of the substance, according to the elements or to connect with cyano groups are organic or inorganic cyanide can be divided into two categories, namely organic cyanide and inorganic cyanide, former known as nitrile, which is often referred to as cyanide and inorganic cyanide is widely used, more varieties.

Cyanide cyanide waste water mainly contains mineral components, are highly toxic substances, a small amount of cyanide will be people, animals in a very short period of time poisoning deaths, including cyanide concentration is very low (<0.05mg / L) lead poisoning fish and other aquatic organisms, but also caused crop failures.

Cyanide pollution of water caused water fish, livestock up the crowd of acute poisoning cases, both domestic and international coverage. These events are due to short-term component will be a lot of cyanide into the water caused. Therefore, in the industrial production process, must be strictly controlled emissions of cyanide components. Particular, must have proper sewage treatment facilities to reduce emissions outside of cyanide.

This paper, physico-chemical techniques?? Chlorine oxidation of the basic principles, processes, equipment selection and future direction of to cyanide effluent disposal as an example of materialization.

2, physico-chemical treatment process Embodied Technology?? Chlorine oxidation process industrial waste water containing cyanide is an effective, practical and economical method.

(1) physical and chemical techniques?? The basic principles of chlorine oxidation

Strong oxidation using chlorine oxidation of cyanide in waste water, to break down into a low-toxic or non toxic chlorine method is called oxidation. In the reaction process, to prevent Cyanogen chloride and chlorine into the air, Yat, the reaction often carried out under alkaline conditions, it is often referred to as alkaline chlorination. Chlorine oxidation in 1942 began to be used in industrial production has been 60 years in our country there are 50 years of application history, and application technology are maturing, therefore, the method is more mature.

(2) the advantages of chlorine oxidation

chlorine oxidation is a mature method, process equipment, has accumulated abundant experience;

number of chlorine oxidation of cyanide mill cyanide wastewater treatment to ensure a more satisfactory result, cyanide can be reduced to 0.5mg / L or less;

cyanates can be further hydrolyzed to produce non-toxic;

toxic heavy metals generate insoluble precipitates, water containing heavy metal concentrations in line with national emission standards;

low investment, simple process equipment, open stop easy operation.

(3) Oxidation reaction mechanism of chlorine

incomplete oxidation (partial cyanide) Chlorine oxidation of cyanate to cyanide oxidation, said the local oxidation of cyanide, cyanates in PH6 ~ 8 hydrolyzed ammonia and carbonate; (about the response time of 1 hour). The overall reaction is as following:

Cl-+ ClO-+2 H2O = NH3 + HCO3-+ Cl-

Or Cl-+ Cl2 +2 OH-+ H2O = NH3 + HCO3-+2 Cl-

Chlorination of the reaction theory than Cl2/CN- = 2.73 (weight ratio, same below).

complete oxidation Chlorine to cyanide oxidation reaction of nitrogen and carbonate as the complete oxidation of cyanide, the overall reaction is as following:

2CN-+5 ClO-+ H2O = 2HCO3-+ N2 +5 Cl-

Or 2CN-+5 Cl2 +10 OH-

= 2HCO3-+ N2 +10 Cl-+4 H2O

Chlorination of the reaction theory than Cl2/CN- = 6.83, treatment 1kg incomplete oxidation of cyanide and more than the consumption of chlorine 4.1kg/kgCN-.

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Waste-water treatment of sewage Yancheng people suffer skyrocketing price of mineral water – water, mineral water, water – Environmental Protection

20 early in the morning, because water appears smell, the main city in Jiangsu province in a large scale occurred without water, the major supermarkets were looted of drinking water.

Yancheng environmental protection department has initially determined that a chemical waste-water treatment of sewage water plant west of the city led to pollution of water by phenol.

According to the municipal communications, the ongoing clean water and sewage pipe network, and start the backup yesterday afternoon, the partial restoration of water supply. But the public still doubts on the ability to use water, when it can resume normal water supply is also not clear.

Prices of mineral water for 10 minutes twice Pavilion Lakes residents

Yancheng Chow said yesterday morning after getting up, it found the tap water in a stock “pesticide smell”, then on without water, and “no face washing into.”

“We all rushed to go into a box to buy mineral water or bottled water, store at home in the spare.” Chow said when he returned home at noon after work to buy water for cooking, and found that many large supermarkets in the pure water has been sold out of supplies, “I ran three supermarkets, a small supermarket at the end only buy the water. and it also take the opportunity to supermarket prices, a colleague before I bought the 16 dollar a box, it is my turn to buy the time of rose to 20 yuan, while the row behind me, my colleagues at the time we went to buy 24 yuan, but after 10 minutes of work. ”

Mr. Zhou also heard colleagues say, Yancheng District, because almost all sold out of supplies of drinking water, and even the public to drive to surrounding areas, “water grab.”

Yancheng city has a population of 8.15 million, is of Jiangsu area of the first, the second largest city population. Caused by chemical waste-water treatment of sewage

Yancheng Government yesterday informed the day of 6:20, found west of the city water plant water smell. After preliminary testing, west of the city water plant, the more the water plant, water source was polluted phenolic compounds, the production of tap water is not suitable for drinking, water immediately close the outlet, leading to the main city of Pavilion Lake, Yandu District, New District, Development Zone wide range without water.

Yancheng EPA official says, the original place Water Pollution , The environmental protection sector working groups tasked four inspections. After initial investigation, the reasons for the pollution, the new Chemical Co., Ltd. Yancheng standard waste-water treatment of sewage.

Yancheng City public security organs have been on file for investigation on the matter. According to the survey, this chemical usually polluted water in a small ditch, but this small ditch, a small dam, this dam to open the factory the day before yesterday, coincided with the Yancheng heavy rain, the sewage flow into the city water plant’s water source west python River.

Yancheng City tap water, from the west, the more River, east of the city water plant to provide 3, one west of the city water plant on the scale of water supply 11.5 million tons, the more the water plant up to 20,000 tons, two main urban areas the main water supply plant ; east of the city water plant scale of 100 thousand tons of water supply for the city’s alternative water sources. Among them, the more water plant west of the city water plant and raw water were taken from the new foreign port, east of the city water plant from Tongyu River. Length 69.80 km of new foreign port, is Yancheng major river drainage into the sea. Start an emergency backup water supply

Resume as soon as possible to ensure urban water supply, Yancheng City Government yesterday launched an emergency backup water intake Tongyu River, east of the city water plant to increase production capacity, limited part of the industrial water and Special use, and enable deep well, yesterday afternoon 2 began to restore the water supply.

Yancheng Government also reminded the public to immediately open the indoor faucet, pipeline emptying more than water, until no smell, “emissions of water free of water.”

As of last night, Yancheng city water borne entirely by the east of the city water plant, but most areas west of the city water pressure is still low.

Yancheng one teacher Cui Haiqing said at 3 pm yesterday, the school water supply has been restored, “but the current flow is still small, I heard a number of senior residents at home or no water pressure may be enough.”

Government, inviting the user to the bottom floor of a high water user or cottage, and urge the public to promote mutual aid Cooperation Spirit.

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Wastewater from a cheese factory has the following composition: 6.0 g/L protein (C16H24O5N4); 13 g/L carbohydrate (CH2O); and 4.0 g/L fat (C8H16O);. What is the total organic carbon (TOC) of the wastewater in g of C/L?

Technorati Tags: carbohydrate, ch2o, cheese factory, composition, organic carbon, protein, toc, wastewater

do you know any sites about regulations and standards of natural and wastewater in Europe (or maybe in the world), also strategic directions for water quality??

Technorati Tags: europe, wastewater, water quality

Bacterial digestion is an economical method of sewage treatment.
5CO2(g) + 55NH4+(aq) + 76O2(g) —>
C5H7O2N(s) + 54NO2-(aq) + 52H2O(l) + 109H+(aq)
bacterial tissue

A. The above reaction is an intermediate step in the conversion of the nitrogen in organic compounds into nitrate ions. How much bacterial tissue is produced in a treatment plant for every 1.0 104 kg of wastewater containing 6.0% NH4+ ions by mass?
in grams
B. Assume that 94% of the ammonium ions are consumed by the bacteria.

Please explain how you got the answers.

Technorati Tags: ammonium ions, aq, bacteria, conversion, digestion, economical method, intermediate step, kg, nitrate, nitrogen, organic compounds, sewage treatment, wastewater

The BOD,5 of a wastewater is 156mg/l at 20C. The k value at 20C is 0.23 day-1.WHAT IS THE BOD7 if the test is run at 16C.

Technorati Tags: bod, wastewater

one pipe can drain a wastewater holding tank in 8 hours. if another pipe is used to work with the first pipe, working together they can drain the same wastewater holding tank in 5 hours. how long would it take for the second pipe to drain the wastewater holding tank by itself?
any help would be greatly appreciated. thanks

Technorati Tags: holding tank, wastewater

Assume that the only reducing agent present in a particular wastewater is SO3^2−. If a 27.50-mL sample of this wastewater requires 34.61 mL of 0.02237 M KMnO4 for its titration, what is the molarity of SO3^2− in the wastewater?

SO3^2-(aq)+MnO4^1- ——> SO4^2- + Mn^2+ (not balanced)

Technorati Tags: ml, mno4, molarity, reducing agent, so3, so4, titration, wastewater

wat shud i include in it like….my poster is to convince ppl not to send wastewater to the river throught the pipes….so wat suhd i include in tht poster…..like additional info n all tht….n i also need a
convincing title…

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http://www.snopes.com/politics/bush/house.asp

1) 4000 square feet is a model of enviro rectitude.
Geothermal heat pumps located in central closet circulate water through pipes burried 300 feet deep in the ground where the temp is a constant 67 degrees. Systems such as the one in this "eco friendly" dwelling use about 25% of the electricity that traditional heating and cooling systems use.
a 25,000 gallon underground cistern collects rainwater gathered from roof runs; wastewater from sinks and toilet and showers goes into underground purifying tanks and is also funneled into the cistern. the water from the cistern is used to irrigate landscaping .

2) 10,000 square foot belle meade consumes 12 times the average for a typical nashville home. 20 rooms. 8 bathrooms heated by natural gas. pool, pool house all heated by natural gas. one month consumes more energy than than the average american home in ONE YEAR.
VJ apparently you’re too fucking stupid to have read what’s posted on the link and instead let your BLIND POLITICAL HATRED AND IDEOLOGY TAKE OVER. fuckin’ 3 holed no braine ditz.

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