Method for purifying pig-raising wastewater by using green water cress

A waste water and water depth technology, applied in chemical instruments and methods, waste fuel, biological water/sewage treatment, etc., to achieve stable operation, unified environmental benefits, easy operation and maintenance

Inactive Publication Date: 2009-09-09
JIAYING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pig farming is a low-profit industry, and it is difficult to bear high treatment costs. Therefore, the anaerobic-constructed wetland treatment process is considered to be an economical and effective method. H

Method used

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Examples

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Effect test

Embodiment 1

[0021] A pig farm with 2,000 pigs in stock has a daily wastewater discharge volume of 50m 3 , using the multi-stage series biogas digester with the patent application number 200710029103.0. The pig wastewater stays in the multi-stage series biogas digester for 4 days; , the water depth is 1.3m, the watercress is cultivated on the floating bed carrier made of foam board or moso bamboo, the plant distance is 10cm, and the plant coverage is 70%; The wetland is 30×15m, adopts the form of free flow, and the water depth is 0.2 meters. Paddy soil is used as the cushion layer. After the wetland treatment, the effluent enters the watercress subsurface artificial wetland and stays for 3 days. The watercress subsurface artificial wetland is arranged in three parallel forms. The surface layer is φ1cm fine sand layer with a thickness of 6cm, the middle layer is φ4cm gravel layer with a thickness of 30cm, and the bottom layer is φ16mm The thickness of the gravel layer is 20cm, and the slop...

Embodiment 2

[0023] A pig farm with 2,000 pigs in stock discharges 50m of pig wastewater every day 3 , pig raising wastewater enters the biogas digester for 8 days; after the biogas digester, the effluent enters the sedimentation tank and stays for 6 days. The sedimentation tank is 30×10m and the water depth is 2m. Watercress is cultivated on a floating bed carrier made of foam board or moso bamboo. The coverage is 50%; after being treated in the sedimentation tank, the effluent enters the artificial wetland of watercress surface flow and stays for 5 days. The thickness is 20 cm, the slope is 0.8%, the distance between plants of watercress is 10 cm, and the plant coverage is 90%. The surface layer is φ2cm fine sand layer with a thickness of 6cm, the middle layer is a φ8cm gravel layer with a thickness of 30cm, the bottom layer is a φ32mm gravel layer with a thickness of 20cm, and the slope is 1.2%. In order to make the influent evenly distributed to the surface of the wetland, PVC pipe clo...

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Abstract

The invention relates to a method for purifying pig-raising wastewater by using green water cress. The method comprises the following steps: (1), the pig-raising wastewater enters a marsh gas tank and stays for 4 days to 8 days; (2), effluent after being treated by the marsh gas tank enters a sedimentation tank and stays for 4 days to 6 days; (3), effluent after being treated by the sedimentation tank enters a green water cress surface current artificial marsh and stays for 3 days to 5 days; (4), effluent after being treated by the green water cress surface current artificial marsh enters a green water cress undercurrent artificial marsh and stays for 3 days to 5 days; and (5), effluent after being treated by the green water cress undercurrent artificial marsh enters an ecological pond, stays for 4 days to 6 days and then is discharged. The effluent after being treated by the ecological pond can pass by a secondary sedimentation tank and a sterilization pond and returns to be used as swinery-flushing water. The method uses a water economic plant-green water cress to purify the pig-raising wastewater, is simple and convenient to operate, has low investment and operation costs, produces byproducts with economic values, such as green water cress, fishes, and the like and can recycle the pig-raising wastewater so as to greatly decrease the purification cost for the swine wastewater and unify economic benefits, social benefits and environmental benefits.

Description

technical field [0001] The invention relates to a method for purifying pig raising wastewater with watercress. Background technique [0002] Pig wastewater is a high-concentration organic wastewater, which is difficult and expensive to treat. The existing processes mainly include: contact oxidation-hydrolysis-two-stage contact oxidation-coagulation process; solid-liquid separation-methane fermentation-submerged biological filter process; contact oxidation-hydrolysis-two-stage contact oxidation-coagulation process; Grade acidification-constructed wetland treatment process; coagulation sedimentation-deammonization-aerobic biochemical process, etc. Pig farming is a low-profit industry, and it is difficult to bear high treatment costs. Therefore, the anaerobic-constructed wetland treatment process is considered to be an economical and effective method. However, in actual operation, the management of wetland vegetation is also a heavy burden for farmers. If the plants with econ...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F3/32C02F3/34C02F11/04C02F1/50
CPCY02E50/343Y02E50/30Y02W10/10
Inventor 利锋张学先何江宋明伟李秉键
Owner JIAYING UNIV
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