Agar is widely used in the food industry, such as various beverages, jelly, eight treasure porridge, etc., with coagulation, stability, and can form complexes with some substances and other physical and chemical properties. However, the production of agar causes the discharge of wastewater, and in the multiple washing process, filtration process, pressing and dewatering process, pollutants are discharged with the wastewater. Among them, the COD concentration is 1750mg/L, the BOD concentration is 500mg/L, and the SS concentration is 65mg/L, which exceeds the "Comprehensive Sewage Discharge Standard" (GB8978-1996). Therefore, it cannot be discharged to the water body, so as not to cause environmental damage. Xiaobian introduces the agar wastewater treatment process, if you like it, you can pay attention to it.
Agar wastewater containing particulate matter (sand particles or salt, etc.) requires the use of grit ponds to reduce particulate matter and reduce the salt content in the water. The agar wastewater after passing through the sand grit tank flows into the regulating tank for uniform water quality and water quantity, reducing the impact load on the subsequent system. Because agar wastewater is highly alkaline wastewater, it is necessary to adjust the pH in the pH tank to 7-8 to prevent the pH value from affecting subsequent biochemical treatment.
After the above level of treatment, the agar wastewater passes through the anaerobic stage under the action of the water pump. The anaerobic process adopts the form of UASB, and the circulating pump water distribution device is provided at the bottom of the tank. A three-phase separator is provided at the top of the pool, and a high-efficiency biofill and a perforated L-type aerator are provided in the aerobic biochemical pool. The bottom sludge is transported to the front-end biochemical system via a sludge return pump. Follow-up into the aerobic pool, aerobic use of biological contact oxidation method, biological contact oxidation method is a kind of biofilm method between the activated sludge method and the biological filter method, in the pool set up filler, the pool bottom aeration of the sewage oxygenation, so that the agar wastewater in the flow state, full contact with the ground filler, to biofilm adsorption of organic matter in the wastewater, under aerobic conditions, organic matter by microorganism oxidation decomposition, agar wastewater is purified.
After the secondary precipitation of wastewater, the discharge standard can be reached, the mature agar production process and the mature and reliable agar wastewater treatment measures, which avoid or slow down the impact of the surrounding environment of the enterprise, and can improve the production efficiency and resource utilization rate, and reduce the production cost of the enterprise.