Be wary: the principle of wastewater treatment in the paper industry should not neglect the choice of process plan. It plays the most important role in the construction of wastewater treatment facilities, ensuring the treatment effect of treatment facilities and reducing operating costs. Therefore, it is necessary to combine design scale, wastewater quality characteristics and local The actual conditions and requirements, the selection of technically feasible, economical and rational processing technology, after the comprehensive technical and economic analysis, the best overall process plan and implementation method are preferred. Dongguan environmental experts reminded the following principles in the determination of the overall process plan for wastewater treatment facilities:
1. The technology is advanced and mature. It has strong adaptability to water quality changes and stable operation. It can ensure that the effluent water quality meets the requirements of factory use standards and national wastewater discharge standards.
2, easy to operate, flexible and easy to manage. According to the water quality and quantity of the influent water, the process parameters and operation should be properly adjusted.
3. Reduce infrastructure investment and operating costs, save floor space and reduce energy consumption.
4. Minimize the adverse effects on the surrounding environment (odor, noise, aerosol, etc.).
5, easy to achieve automatic control, improve operational management.
Selection of process plan: Drawing on the previous experience of waste papermaking wastewater treatment, some of the water quality requirements of the pulping system are not high, as long as the COD is less than 1500mg/l and the SS is less than 200mg/l. It can be reused. Considering to reduce the investment scale and reduce the processing cost, the program determines that the wastewater is treated by microporous hydraulic sieve and air flotation to a total of 8000 cubic meters per day, of which 3000 cubic meters per day is directly reused in the pulping system. (The water quality can meet the process requirements). After the remaining 5000 cubic meters per hour, after biochemical treatment, part of it is recycled to the papermaking system, and the excess part is discharged to the standard. At this time, the water consumption of the whole plant production wastewater can reach 75% (6000 cubic meters). m/day), this indicator is at the leading level in China. The treatment process mainly adopts a combination of physicochemical and biochemical treatment, and the wastewater is classified according to the requirements of wastewater quality and reuse water quality. The microfiber hydraulic screen is used to filter the wastewater to recover the available paper fibers. After the suspended matter is removed by the first-stage air flotation device, part of the wastewater (3000m3/d) is reused in the pulping process, and the remaining wastewater (5000m3/d) is sent to the biological contact oxidation tank through the self-flow, and the aeration system is set in the contact oxidation pond. And combining the filler, using the microorganisms on the filler to remove organic matter, ammonia nitrogen, chromaticity, etc. in the wastewater, the effluent of the biological contact oxidation tank flows into the secondary coagulation air flotation device, and the wastewater is provided with a pipeline mixer at the front of the air flotation, and the medicament After thorough mixing and reaction, the air is floated and separated in the air floating pool. The effluent is collected and flowed into the clear water pool through the water outlet pipe. The water quality of the clean water meets the requirements of the national first-class standard for sewage discharge and the water production standard for papermaking. The primary air flotation and secondary air flotation sludge are discharged into the sludge storage tank. The sludge in the sludge storage tank is regularly sent to the mud dewatering device for dehydration, and the dewatered sludge is transported for disposal. The treated effluent is discharged into the clear water pool for reuse, and excess water is discharged.
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