Wastewater treatment technology for concentrated and diluted livestock and poultry manure

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The wastewater treatment technology for livestock and poultry manure based on separation of concentrated and dilute streams was developed to address issues such as large volumes of wastewater generated from livestock and poultry farming, low concentrations of that wastewater, difficulties in raising temperatures, low efficiency in anaerobic digestion to produce biogas, challenges in treating and utilizing biogas slurry, as well as high costs associated with investment and operation. This technology was created through theoretical and methodological innovations. 　　This technology offers the following advantages: it improves the efficiency of biogas fermentation from manure, ensuring normal gas production during winter ； It increases the nutrient content of some biogas slurry, making it easier to use it in fields ； Significantly reduces the concentration of certain wastewater pollutants, making it easier to meet regulatory standards ； Compared with the previous \"anaerobic-aerobic\" process for livestock and poultry manure treatment, the removal efficiency of pollutants is improved, and the concentration of pollutants in the effluent is reduced ； No external organic carbon needs to be added, nor is it necessary to supply extra alkali to maintain system alkalinity, resulting in low treatment costs. 　　This technology is suitable for biogas fermentation and treatment to meet standards of wastewater from large-scale livestock and poultry farming, slaughterhouses, and food processing industries. 　　This technology achieves a COD removal rate of over 93%; the removal rates for dissolved oxygen consumed by microbial metabolism (BOD5) and ammonia nitrogen are over 97%, the SS removal rate is over 95%, and the TN removal rate is over 90% ； The gas production efficiency is increased by more than 30% on average compared to traditional processes ； The nutrient content in the concentrated slurry increases by over 50% ； The volume of the biogas fermentation unit is reduced by more than 30% ； The operating costs for wastewater treatment have been reduced by over 30%.