Feasibility analysis of application in industrial wastewater treatment
1. Basic introduction
Heavy metal pollution refers to environmental pollution caused by heavy metals or their compounds. Mainly caused by human factors such as mining, waste gas discharge, sewage irrigation and the use of heavy metal products. For example, water weather disease and pain disease in Japan are caused by mercury pollution and cadmium pollution respectively. The degree of harm depends on the concentration and chemical form of heavy metals in the environment, food and organisms. Heavy metal pollution is mainly manifested in water pollution, and part of it is in the atmosphere and solid waste.
Heavy metals refer to metals with a specific gravity (density) greater than 4 or 5, and there are about 45 kinds of metals, such as copper, lead, zinc, iron, diamond, nickel, vanadium, silicon, button, titanium, manganese, cadmium, mercury, tungsten, molybdenum, gold , Silver, etc. Although manganese, copper, zinc and other heavy metals are trace elements required for life activities, most of the heavy metals such as mercury, lead, cadmium, etc. are not necessary for life activities, and all heavy metals above a certain concentration are toxic to the human body.
Heavy metals generally exist in nature in natural concentrations. However, due to the increasing exploitation, smelting, processing and commercial manufacturing of heavy metals by humans, many heavy metals such as lead, mercury, cadmium, cobalt, etc. enter the atmosphere, water, and soil. Cause serious environmental pollution. Heavy metals in various chemical states or chemical forms will persist, accumulate and migrate after entering the environment or ecosystem, causing harm. For example, the heavy metals discharged with wastewater can accumulate in algae and bottom mud even if the concentration is small, and be adsorbed on the surface of fish and shellfish, resulting in food chain concentration, thereby causing pollution. For example, water ailments in Japan are caused by mercury in the waste water discharged from the caustic soda manufacturing industry, which is transformed into organic mercury through biological action; another example is pain, which is caused by the cadmium discharged from the zinc smelting industry and the cadmium electroplating industry. To. Lead discharged from automobile exhaust enters the environment through atmospheric diffusion and other processes, resulting in a significant increase in the current surface lead concentration, resulting in the absorption of lead in modern humans about 100 times higher than that of primitive humans, and harming human health.
Macromolecular heavy metal water treatment agent, a brown-red liquid polymer, can quickly interact with various heavy metal ions in wastewater at room temperature, such as Hg+, Cd2+, Cu2+, Pb2+, Mn2+, Ni2+, Zn2+, Cr3+, etc. It reacts to form water-insoluble integrated salts with a removal rate of over 99%. The treatment method is convenient and simple, the cost is low, the effect is remarkable, the amount of sludge is small, stable, non-toxic, and there is no secondary pollution. It can be widely used in wastewater treatment in the electronics industry, mining and smelting, metal processing industry, power plant desulfurization and other industries. Applicable pH range: 2-7.
2. Product application field
As a very effective heavy metal ion remover, it has a wide range of applications. It can be used for almost all waste water containing heavy metal ions.
3. Use method and typical process flow
1. How to use
1. Add and stir
① Add the polymer heavy metal water treatment agent directly to the heavy metal ion-containing wastewater, instantaneous reaction, the best method is to stir every 10min–times;
②For uncertain heavy metal concentrations in wastewater, laboratory experiments must be used to determine the amount of heavy metal added.
③For the treatment of wastewater containing heavy metal ions with different concentrations, the amount of raw materials added can be automatically controlled by ORP
2. Typical equipment and technological process
1. Pretreat the water 2. In order to obtain PH=2-7, add acid or alkali through the PH regulator 3. Control the amount of raw materials added through the redox regulator 4. Flocculant (potassium aluminum sulfate) 5. Residence time of the stirring tank 10min 76, retention time of the agglomeration tank 10min 7, sloping plate sedimentation tank 8, sludge 9, reservoir 10, filter 121, final pH control of the drainage pool 12, discharge water
4. Analysis of economic benefits
Taking electroplating wastewater as a typical heavy metal wastewater as an example, in this industry alone, application companies will achieve huge social and economic benefits. Electroplating wastewater mainly comes from the rinsing water of plating parts and a small amount of process waste liquid. The type, content and form of heavy metals in the wastewater vary greatly with different production types, mainly containing heavy metal ions such as copper, chromium, zinc, cadmium, and nickel. . According to incomplete statistics, the annual discharge of wastewater from the electroplating industry alone exceeds 400 million tons.
Chemical treatment of electroplating wastewater is recognized as the most effective and thorough method. However, judging from the results of many years, the chemical method has problems such as unstable operation, economic efficiency and poor environmental effect. The polymer heavy metal water treatment agent is very Solved well. The above problem.
4. Comprehensive evaluation of the project
1. It has a strong reducing ability to CrV, the pH range of reducing Cr” is wide (2~6), and most of them are slightly acidic
The mixed wastewater can eliminate the need to add acid.
2. It is strongly alkaline, and the pH value can be increased at the same time it is added. When the pH reaches 7.0, Cr (VI), Cr3+, Cu2+, Ni2+, Zn2+, Fe2+, etc. can reach the standard, that is, heavy metals can be precipitated while reducing the price of VI. The treated water fully meets the national first-class discharge standard
3. Low cost. Compared with the traditional sodium sulfide, the processing cost is reduced by more than RMB 0.1 per ton.
4. The processing speed is fast, and the environmental protection project is highly efficient. The precipitation is easy to settle, which is twice as fast as the lime method. Simultaneous precipitation of F-, P043 in wastewater
5. The amount of sludge is small, only half of the traditional chemical precipitation method
6. There is no secondary pollution of heavy metals after treatment, and traditional basic copper carbonate is easy to hydrolyze;
7. Without clogging the filter cloth, it can be processed continuously
Source of this article: Sina Aiwen shared information
Post time: Nov-29-2021