Combined process for treating high-ammonia-nitrogen wastewater and treatment system

Abstract

The invention discloses a combined process for treating high-ammonia-nitrogen wastewater. The method comprises the following steps: carrying out solid-liquid separation; carrying out biological rotating disc pretreatment; carrying out biological contact oxidation deep treatment; and carrying out coagulating sedimentation;a biological rotating disc pretreatment unit of a treatment system adopted inthe process is supported on a same rotating shaft by adopting a plurality of rotating discs; each rotating disc is driven to rotate by planet row reduction gearboxes with different transmission ratios; the rotating speed of the rotating disc is gradually reduced from the water inlet end to the water outlet end; the biological rotating disc pretreatment unit also adopts a blast aeration device toadjust the dissolved oxygen concentration of the high-ammonia-nitrogen waste liquid; a pretreatment system has higher pollutant load; a plurality of contact oxidation fillers are arranged in the biological contact oxidation advanced treatment unit; by means of the electrolysis and biological membrane degradation characteristics of iron-carbon micro-electrolysis-activated carbon fiber combination,the nitrogen and phosphorus removal efficiency of the system is enhanced, particularly when low-carbon high-ammonia-nitrogen wastewater (biogas slurry) is treated, serious imbalance of the C/N ratio in the biogas slurry is overcome, and the treatment efficiency of the high-ammonia-nitrogen wastewater is improved.

Description

technical field [0001] The invention relates to the technical field of waste water treatment, in particular to a combined process and a treatment system for high ammonia nitrogen waste water treatment. 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 and heavy metals in farmland, and rural livestock manure Organic or inorganic substances such as domestic garbage, from non-specific areas, under the action of precipitation and runoff, through farmland surface runoff, farmland drainage and underground seepage, a large number of pollutants enter the receiving water body (rivers, lakes, reservoirs, Bay) caused by pollution. At present, livestock and poultry breeding wastewater, such as suspended solids, organic pollutants and ammonia nitrogen "three high" organic wastewater, is the main source of agricultural non-poi...

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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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