Water treatment method for cyclic purification of shrimp breeding wastewater

[0012] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0013] refer to figure 1 , A method for treating prawn breeding wastewater by circulating and purifying water, comprising microbial pre-purification in a prawn culturing pond and a purification system sequentially connected to the prawn cultivating pond through a water pipe, the purification system comprising a backflushing type physical filter tank, a sedimentation tank, a plant Filter tank, biological purification tank, water pump, water storage buffer tank, ozone/ultraviolet sterilization, oxygenation, and temperature adjustment water quality optimization tank. Flushing activated carbon filter tank, plant filter, recoil type biological purification tank, water storage buffer tank, ozone/ultraviolet sterilization, oxygenation, temperature adjustment water quality optimization tank, the discharge port of the water quality optimization tank is connected to the shrimp culture through the flow channel For the water inflow of the pond, the center of the cultivating pond is vertically provided with a drainage pipe that can draw water in layers, the center of the pond bottom of the cultivating pond is provided with a pipe and is connected to the particle collection and removal pond, and the water of the cultivating pond is collected into a The flow channel enters the recoil-type physical filter tank, and the large particles such as residual bait and feces are removed by the recoil-type physical filter tank. After further clarification in the sedimentation tank, it passes through the plant filter tank and the biological purification tank, and flows through ozone/ultraviolet disinfection. The device kills bacteria, viruses, parasite eggs and other harmful organisms in the water body. The sterilized water is oxygenated and temperature-regulated in a water quality optimization tank to remove residual ozone, increase dissolved oxygen in the water body and oxidize some organic matter, and then flow back to the aquaculture tank for recycling.

[0014] Described microbial pre-purification is to put nitrifying bacteria, nitrifying bacteria, and denitrifying bacteria in four types of microbial functional bacteria, namely Thiobacillus denitrification, sulfur bacteria, and photosynthetic bacteria, into the remaining bait and decompose them by different microorganisms. In aquaculture water with different pollutants—ammonia or/and ammonium, reduced sulfide and small molecular organic matter, the total input amount is 0.05-0.20% of the volume of aquaculture water. Bacteria and nitrifying bacteria: Thiobacillus denitrificans in denitrifying bacteria: Sulfur bacteria: Photosynthetic bacteria=(1~4):(1.6~3):(2~3.6):(1~4).

[0015] The plant filter is composed of coarse slag, limestone, crushed stone and coarse sand, and is laid from bottom to top according to the particle size. Water pipes, the plant filter is provided with Phragmites australis of the Poaceae family, Canna of the Canna family Canna, Mint of the Lamiaceae genus, the biological purification pool is rectangular or circular, brick, stone, inner layer Five layers of waterproof layer should be applied. In order to achieve dark sedimentation, the top of the pool should be covered. The bottom of the pool should have a slope of 1-3% to facilitate cleaning and sewage discharge. The pond is generally divided into 2 to several compartments. Filter-feeding shellfish are stocked in the biological purification pond: oysters, clams, clams, mussels, and filter-feeding fish: tilapia, mullet, yellowfin bream. These bioenergy The organic particles in the aquaculture sewage are ingested, and algae are also planted in the biological purification ditch 13 .

[0016] The sedimentation tank is a sand filter, and the commonly used filter materials are sand, gravel, oyster shell, quartz sand, medical stone, microporous ceramics, coral sand, and diatomite; the diameter of the finest layer of sand is 0.15-0.20mm, The effective depth is up to 1m. Between the porous filter materials, protozoa and bacteria naturally form biofilms, and with the help of microorganisms, the content of ammonia nitrogen, nitrite and nitrate nitrogen in the water is reduced.