Recovery system; 3. Dilute ammonia progressively concentrate system;
4. JTL-4 fine desulfurization system; 5. "double A" system;
6. Synthetic air release hydrogenation system; 7. Methanol distillation system; 8. Hydrogen peroxide technical transformation and expansion. Hydrogenation fixed bed, oxidation tower, extraction tower, purification tower, white clay bed,
Distillation towers, compressors, and waste heat boilers Domestic purchase I0113 Phosphorus gypsum wastes for chemical fertilizers and sewage treatment works Phosphogypsum using chemical fertilizer waste residues, using German advanced technology,
The company will introduce key equipment and build an annual output of 10 million square meters of gypsum board; 7,000 tons of caulking gypsum powder and sewage treatment center. Filter Press, Meter, Calciner, Calcined Dryer, Filter, Knife, Forming Workbench,
Drying furnace and other equipment. Domestic procurement of I0234 wastewater comprehensive treatment project content: alkaline recovery and filling up; middle water treatment; white water recovery; black liquor extraction and multi-stage bleaching; public works; paper processing workshop. The main products: 4 328 t/d of alkali recovered; recycled water and fiber. Plate evaporator, thickener, coater, white water collector, mid-stage water treatment equipment, 20 tons/golden angle furnace, turbine generator. Key equipment required for the introduction of foreign projects abroad (environmental protection projects)
The use of sodium hypochlorite for advanced treatment of the effluent after coagulation and sedimentation can also achieve good results (see Table 1). However, compared with the potassium permanganate preoxidation method, the performance of the drug is larger, and the effect is slightly worse. Therefore, the use of potassium permanganate pre-oxidation method is more appropriate.
It can be seen from Table 1 that after the waste paper papermaking wastewater is treated by the chemical treatment method, its indexes are all better than the national discharge standards, and the quality of the reuse water is also met. Since the chemical treatment method reduces the accumulation of harmful substances, it is necessary to increase the amount of reuse water in practice so as to reduce the production cost and reduce the waste of water resources.
3 Conclusion
At present, recycled paper and paper has occupied a very important position in the paper industry. Therefore, people are increasingly demanding the treatment of waste paper papermaking wastewater as a new source of pollution. From the analysis of this paper, we can see that the wastewater treatment technology for waste papermaking wastewater has become more and more mature, and it has a positive role in accelerating the effective treatment of the wastewater.
The coagulation and sedimentation method has a good effect on the removal of suspended matter and color, and it can also remove some of the dissolved COD. However, the COD index of wastewater after treatment is still high, and it is difficult to meet the emission standards. Therefore, the coagulation and sedimentation method can only be used as a primary treatment process for waste paper papermaking wastewater, or in combination with a chemical pre-oxidation method.
Waste paper papermaking wastewater is suitable for biochemical treatment after coagulation and sedimentation. Since the biochemical treatment can remove organic matter of lower molecular weight and make up for the defects of the coagulation and sedimentation method, it is reasonable to constitute a secondary treatment process by these two methods. After the waste paper papermaking wastewater is combined and processed by this process, all indicators can meet the emission standards. The advantage of this method is that the treatment effect is good and the operation cost is low; but the shortcomings are long processing period, large device area, and high one-time investment.
The use of chemical treatment of waste papermaking wastewater not only overcomes the deficiencies of biochemical methods, but also has the advantages of good treatment effect and low processing cost. In particular, the potassium permanganate pre-oxidation method can effectively treat waste water without adding equipment on the basis of the coagulation and sedimentation method. At the same time, the pre-oxidation method can reduce the accumulation of harmful substances and help improve the reuse of water. Cycle utilization, and it is expected to achieve a closed loop of water. Therefore, the author believes that this method is more in line with China's national conditions and it is necessary to carry out further research and development.
(Author: Maxiao Ou Shao whole)
The dining table and chair combination in a restaurant refers to the combination of tables and chairs used for dining. According to different needs and styles, restaurant dining table and chair combinations can be classified into various categories. The following will classify and introduce common dining table and chair combinations in restaurants.
1. Classified by purpose
1) Dinner table and chair combination: mainly used in formal dining venues, such as high-end restaurants, banquet halls, etc. The combination of dining tables and chairs usually uses high-end materials such as solid wood, marble, etc. The chairs are generally equipped with soft cushions to provide a comfortable dining experience.
2) Fast food table and chair combination: mainly used in fast food restaurants, coffee shops, and other fast-food restaurants. The combination of fast food tables and chairs usually adopts a simple and practical design. The tables are generally small, and the chairs are generally made of plastic or metal materials, which are easy to clean and move.
3) Outdoor table and chair combination: mainly used in outdoor dining venues, such as outdoor restaurants, balconies, etc. Outdoor table and chair combinations usually use materials with special treatments such as waterproof and anti-corrosion, such as aluminum alloy, plastic, etc., which have the characteristics of durability and easy cleaning.
2. Classify by Style
1) Modern style table and chair combinations: Modern style table and chair combinations usually adopt a simple and streamlined design, emphasizing practicality and comfort. The combination of modern style tables and chairs is suitable for modern restaurants, cafes, and other places.
2) European style table and chair combinations: European style table and chair combinations usually adopt gorgeous carved and curved designs, emphasizing details and decoration. The European style table and chair combination is suitable for high-end restaurants, banquet halls, and other places.
In summary, restaurant table and chair combinations are classified based on factors such as purpose and style. Different classifications are suitable for different types and needs of restaurants, and choosing the appropriate combination of dining tables and chairs can provide a better dining experience and comfort for the restaurant.
Beach table, beach chair,dining furniture
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