Fungho Industries (Group) Co., Limited , https://www.funghogroup.com
(1) Focus on the principle of "safety" of drinking water. No matter which technology is used, the quality of treated water must meet the requirements of GB5749-2001 Sanitary Standard for Drinking Water. This is the premise and the first principle.
(2) Technology is safe and reliable: At present, there are many theories and equipments in water treatment technology, and it must be ensured that the selected technology is mature both in theory and equipment.
(3) Low operating costs: Relatively backward economic conditions in rural areas require low equipment operation costs. This is an important basis for the selection of project plans; otherwise, the result of project completion will be idle, and the construction of rural drinking water safety projects will lose its true significance.
(4) Simple management: In the face of the relative shortage of rural technicians, equipment management and maintenance are relatively simple. If the technology is too complex or cumbersome, it will affect the normal operation and management of water treatment equipment.
(5) Investment province: In the premise of meeting the above principles, the investment should be saved as much as possible.
Comprehensive current various water treatment technologies, especially arsenic, fluorine and other processing technologies, are mainly led by the following methods and theories.
The arsenic removal program with relatively mature equipment and process technology currently has three main technologies: membrane (reverse osmosis) technology, ion exchange technology, and electrodialysis technology. Judging from the current actual operation of the project, the membrane technology generally has the problem of high operating costs and is not suitable for rural drinking water safety projects; the electrodialysis technology is theoretically low in operating costs, but the actual operating costs of different equipment Also vary greatly; ion exchange technology in the actual project due to more frequent replacement of the media, management is more complex, operating costs vary depending on the source of the media and the frequency of replacement.
At the same time, two new technologies emerged. They are composite multi-media filtration technology and electro-flocculation technology. The composite multi-media filtration water treatment method overcomes some defects of other ion exchange technologies from the equipment technology and is economically feasible; the electro-flocculation technology, as a new technology, concentrates the advantages of electrochemical technology, and has low operating costs and management. Simple and other advantages. Therefore, these two technologies should be a good choice for the water treatment process technology of rural drinking water safety projects. In order to explore a water treatment equipment suitable for rural drinking water safety engineering, this paper compares these two technologies.
Chemical water treatment equipment technology in the industry Chemical water treatment equipment technology in the chemical industry water: chemical reaction cooling, chemical agents, fertilizers and fine chemicals, cosmetics manufacturing process water system.
Main uses: textile printing and dyeing, water for papermaking, pure water for production of chemical reagents. Pure water for skin care products, pure water for shampoo production, and pure water for hair dye production. Chemical laboratory, physics laboratory, biological laboratory.
Industrial product coating water:
Surface coating, cleaning, coated glass and battery water systems for automobiles, household appliances and building materials.
The main purpose: electroplating, glass coating with high purity water.
In addition to the working principle of the iron-manganese filter, the groundwater iron-removing manganese filter utilizes the catalysis of the surface active filter membrane. When the aerated oxygen-containing water flows through the sand filter layer, the iron in the water due to the contact catalytic action of the filter media Manganese ions start to oxidize, so that the iron and manganese ions in the water form an active oxide film containing crystal water on the surface of the filter material, which is removed by physical retention and adsorption. In addition to iron-manganese filter equipment using deep well water pressure jet aeration, no additional aeration equipment, stable and reliable. The role of aeration is to increase the dissolved oxygen in the water while removing CO2 and increasing the pH of the water.
There are two kinds of filter materials for chemical water treatment equipment: quartz sand and natural manganese sand filter. The former is used in raw water with iron content below 10mg/L, small manganese content, and PH value above 6.8. The latter is suitable for raw water with iron content below 20mg/L, high manganese content, and PH value above 6.
(1) Fe-Mn filter can remove iron, manganese and many kinds of harmful metals with a removal rate of more than 90%. It can directly treat high-iron-containing groundwater into potable water, and can also be used to decolorize, deodorize and deodorize water. Wait.
(2) Raw water: iron content ≤ 10mg/L, manganese content ≤ 3mg/L, water temperature> 6 to 10°C, alkalinity> 2mg/L.
(3) After treatment, the iron content is ≤ 0.3mg/L and the manganese content is ≤ 0.1mg/L, which is in line with the national drinking water standards.
(4) If the quality of the raw water exceeds the above criteria, the equipment may be used in series or increased in the oxidation and coagulation system.
(5) The iron and manganese removal filters are widely used in the water purification of car wash, landscape, food, beverage, medicine, electronic and thermal power generation industries.
Water treatment equipment construction standards:
1. In the process of construction, commissioning and acceptance of water treatment equipment, where mechanical installation, pipeline construction, welding technology, monitoring instrumentation, and program control, etc., shall be used in conjunction with design regulations, national standards, and corresponding technical conditions.
2. The construction of water treatment equipment shall be carried out according to the design drawings and the relevant technical documents of the manufacturer. Before the equipment is in place, the construction unit shall jointly check the following with the installation, civil construction, supervision and other units:
(1) The geometric dimensions, corresponding positions and elevations of the equipment foundation should meet the design requirements;
(2) Pre-embedded parts and reserved holes on the basis of reinforced concrete beams, columns and equipment, the size and location of which shall meet the design requirements;
(3) Flat-bottom tanks should be cushioned on the basis of the equipment. The center of the cushion should have a slope outward, and the center should be 15mm~20mm higher than the edge.
III. Before the commissioning of the water treatment equipment, the civil engineering construction shall complete the following work:
(1) The anti-corrosion surface, anti-corrosion channel and neutralization pool inside and outside the water treatment facility shall be completed and qualified. Drainage and slag discharge channels are unobstructed, the ditch cover is complete, and the surface of the plate is flush with the ground;
(2) The paint, paint, ground, platforms, ladders, doors and windows inside the water treatment room shall be completed according to the design requirements;
(3) The construction of the laboratory's water supply, ventilation, air conditioning, lighting, power supply, and experimental stations shall be completed according to the design requirements;
(4) The structures of the acid-base storage facilities and the anti-corrosion and ventilation facilities shall be fully constructed and qualified.
Fourth, all equipment of water treatment equipment is installed and can be put into use.
5. Electrical, thermal, chemical instruments and operating panels related to the water treatment system should be installed and calibrated correctly. The instructions are correct, the operation is sensitive, and they can be put into use (excluding the programmable control device).
Sixth, lighting and communication facilities should be able to meet the normal operation of trial operation.
7. The rotating machinery shall pass the trial operation of the sub-section.
8. All pipelines and equipment shall be painted in accordance with the relevant regulations.
9. The specifications of filter materials, exchangers, and medicines required for water treatment equipment shall comply with the design regulations, and the quantity shall meet the requirements for start-up and commissioning, and the filling shall be completed.
Water treatment equipment selection needs to be adapted to local conditions
The selection of water treatment equipment needs to be tailored to local conditions in view of the characteristics of rural drinking water safety. The following principles should be followed when selecting water treatment equipment: