Technical policy for prevention and control of was

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Technical policies for the prevention and control of wastewater pollution in straw pulp and paper industry

I. General Provisions

1. pulp and paper industry is one of the industries that seriously pollute the water environment at present. This technical policy is formulated in accordance with the law of the people's Republic of China on the prevention and control of water pollution in order to strictly control water pollution in the paper industry, guide the prevention and control of water pollution in the paper industry, and gradually realize cleaner production and sustainable development

2. this technical policy is applicable to the high-speed railway detection instrument company of pulp and paper enterprises using reed, bagasse, wheat straw and other non wood fibers as raw materials

3. relevant government departments at all levels should strengthen the macro management of the paper industry, rely on policies and measures, adjust and optimize the structure of enterprises, raw materials and products, and encourage the adoption of cleaner production technology. We will phase out small-scale, technologically backward and seriously polluting enterprises, and ensure rational distribution and scale operation to achieve coordinated development

4. vigorously develop the production of papermaking timber forest and gradually increase the proportion of wood pulp; Expand the use of secondary fiber proportion; Scientific and rational utilization of straw pulp resources and raw materials. 2、 Control objective

5. by the end of 2000, all paper-making enterprises should achieve emission standards, basically control the development trend of environmental pollution in the paper-making industry, and gradually embark on a benign development track

6. according to the principle of unifying development and environmental protection, combined with the characteristics of non wood fiber pulping and papermaking wastewater treatment, non wood fiber pulping and papermaking enterprises should have a certain scale of pollution treatment. Newly built wheat straw pulping and papermaking enterprises should have more than 34000 tons of pulp/year, and other non wood pulp factories should have more than 50000 tons of pulp/year; 17000 T/a alkali process chemical straw pulp plant is the smallest scale for alkali recovery

7. resolutely ban chemical pulp mills (workshops) with an annual output of less than 5000 tons; For the existing small chemical pulp enterprises with a capacity of less than 17000 tons/year, the tasks of environmental governance will be completed by the end of 2000 by means of governance, closure, shutdown, merger and transfer. 3、 Technical measures

8. in the process of technological transformation and pollution control, paper enterprises should adopt cleaner production processes with low energy consumption and low pollution load emissions; Improve the technical starting point, such as using straw pulp raw materials with low silicon content and high fiber content

9. in the process of technological transformation and pollution control, paper enterprises should adopt cleaner production processes with less energy consumption and less pollution load emissions. Straw pulp with low silicon content and high fiber content, automatic packaging technology and chlorine less and chlorine free bleaching process are adopted

10. strengthen the high purification of raw materials, and adopt the two-stage dry method or the combination of dry and wet methods to remove the sediment and impurities in raw materials

11. it is recommended to adopt a complete set of wastewater treatment technology with the conventional combustion alkali recovery technology as the core

(1) high efficiency black liquor extraction technology, the extraction rate of black liquor is more than 85%

(2) · new full plate falling film evaporator or tube plate combination straw pulp black liquor evaporation technology

(3) high efficiency straw pulp black liquor combustion technology

(4) continuous causticization technology

(5) free alkali keeping technology: adopt alkali adding protection or high alkali cooking to keep the free alkali concentration of black liquor entering the evaporation section and achieve the purpose of viscosity reduction

12. anaerobic aerobic treatment technology is recommended for the treatment of semi chemical pulp, lime pulp and chemical mechanical pulp wastewater to meet the discharge standard; Sulfite pulping should not be expanded. Although the pulping wastewater of existing enterprises is not the best, comprehensive utilization technology should be adopted to achieve up to standard discharge

13. secondary biochemical treatment technology is adopted for the wastewater in the middle stage of washing, beneficiation and bleaching

14. the white water of paper machine adopts the closed recycling technology of separated fiber

15. the production water can be recycled until the oil level reaches half of the sight glass:

(L). The new EU standard for the use of bleached pulp washing water also stipulates some experimental methods, which not only consider the actual scene to wash unbleached pulp

(2). The remaining water and condensate of the paper machine are used for pulp washing or bleaching

16. encouraged research fields of wastewater treatment technology:

(1) simultaneous desilication technology of cooking to improve the physicochemical properties of black liquor

(2) develop high-efficiency extraction equipment for straw pulp black liquor, so that the extraction rate of black liquor can reach more than 90%

(3) deep delignification technology to minimize pollutant emissions

17. Technologies that should not be popularized at present:

(1) using flocculants alone to treat pulping black liquor

(2). Pollution control technologies that have not been tested in production and operation (other types of alkali recovery technologies and some comprehensive utilization technologies)

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