A combined process and treatment system for high ammonia nitrogen wastewater treatment

Abstract

The invention discloses a combined process for the treatment of high ammonia nitrogen wastewater, which comprises the following steps: solid-liquid separation → biological turntable pretreatment → biological contact oxidation advanced treatment → coagulation and sedimentation. The biological turntable pretreatment unit of the treatment system adopted in the process is adopted A plurality of turntables are supported on the same rotating shaft. Each turntable is driven by a planetary gear reducer with different transmission ratios. The rotation speed of the turntable is gradually reduced from the water inlet to the water outlet. The gas device adjusts the dissolved oxygen concentration of the high ammonia nitrogen waste liquid, so that the pretreatment system has a higher pollutant load, and the biological contact oxidation advanced treatment unit is equipped with several contact oxidation fillers, which rely on the iron-carbon micro-electrolysis-activated carbon fiber combination. The characteristics of electrolysis and biofilm degradation enhance the efficiency of nitrogen and phosphorus removal in the system, especially when dealing with low-carbon and high-ammonia-nitrogen wastewater (biogas slurry), overcoming the serious imbalance of the C / N ratio in the biogas slurry and improving the treatment efficiency of high-ammonia-nitrogen wastewater .

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a combined process and a treatment system for treating high-ammonia-nitrogen wastewater. Background technique [0002] Rural non-point source pollution refers to dissolved or solid pollutants in rural life and agricultural production activities, such as soil particles, nitrogen, phosphorus, pesticides, heavy metals, and rural livestock manure in farmland. With organic or inorganic substances such as household garbage, from non-specific areas, under the action of precipitation and runoff erosion, through farmland surface runoff, farmland drainage and underground leakage, a large number of pollutants enter the receiving water bodies (rivers, lakes, reservoirs, pollution caused by the bay). At present, the organic wastewater with suspended solids, organic pollutants and ammonia nitrogen "three highs" in livestock and poultry breeding wastewater is the main source of ag...

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Problems solved by technology

[0012] 1. The advanced treatment process with a large processing capacity has certain requirements on the diameter of the biological disk. The larger the wastewater treatment volume, the larger the diameter of the disk, or the more turntable groups are required, which will not only increase the occupation Land area, adding more bio-disc plates, increasing infrastructure costs;

[0013] 2. If the low-temperature high-ammonia-nitrogen wastewater below 15-18°C is to be treated, the biological turntable system needs to be built indoors or buried underground, and a heating device is added at the same time, which increases the operating cost and infrastructure cost

[0014] 3. After the livestock and poultry breeding wastewater is treated by anaerobic fermentation, although most of the COD (organic matter) is removed, the ammonia nitrogen only changes in form, and the concentration is still high, forming low-carbon and high-ammonia nitrogen wastewater (biogas slurry), biological turntable wastewater treatment When the system treats low-carbon high-ammonia-nitrogen wastewater (biogas slurry), the microbial resistance to high ammonia-nitrogen is poor. Due to the serious imbalance of the C / N ratio in the biogas slurry, the insufficient carbon source will lead to poor denitrification effect of the biological turntable wastewater treatment system. If you want to continue to carry out advanced processing, it will inevitably complicate the subsequent process and increase the processing cost

These methods improve the biodegradability and denitrification effect of the biogas slurry to a certain extent, often at the cost of increasing the energy consumption and cost per unit of wastewater treatment. For large-scale farms with an average daily wastewater production of hundreds of tons, the operating cost is too high. High, unable to afford, resulting in the long-term problem of wastewater treatment in livestock and poultry farms that is difficult to effectively solve

[0017] The biological contact oxidation advanced treatment unit has the characteristics of strong impact load resistance and no need for reflux, and the contact oxidation filler has a large specific surface area and adsorption performance, and has a good oxygen mass transfer coefficient. It is widely used in the treatment of low-carbon high Ammonia nitrogen organic wastewater (biogas slurry), but high ammonia nitrogen has a strong toxic effect on microorganisms, and most organic wastewater has poor biodegradability, resulting in unsatisfactory denitrification and organic matter removal effects. Nitrogen and phosphorus removal function, which limits the effect of pollutant treatment

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