Method for repairing beach wetland by papermaking wastewater irrigation

Abstract

The invention discloses a method for irrigating and restoring a mudflat wetland through utilization of papermaking wastewater. The method comprises that: a first end wall and a second end wall are arranged on ground; water guide vertical walls are arranged between the first end wall and the second end wall; one end of the water guide vertical wall with an odd number is fixedly connected with the inner side of the first end wall, while the other end is the dissociative end; one end of the water guide vertical wall with an even number is fixedly connected with the inner side of the second end wall, while the other end is the dissociative end; the ground of the flow deflection part of the dissociative end of the water guide vertical wall which the papermaking wastewater flows through is provided with a filtering material rectification and distribution region; the papermaking wastewater is guided from the first water guide vertical wall and the second water guide vertical wall; the irrigation depth h is between 8 and 15 cm; hydraulic load is between 2 and 4 cm / d; an intermittent irrigation mode of each water inlet and irrigation between 6 and 10d and draining and dry-falling between 2 and 4d is adopted for irrigation; after wastewater is used for irrigation, the contents of Cl<-> and Na<+> of soil are reduced; the contents of total nitrogen, total phosphor and organic matter are improved; the respiratory intensity of the soil is improved; and the activity of microorganism of the soil is substantially improved.

Description

technical field [0001] The invention belongs to environmental engineering, in particular to a method for irrigating and repairing tidal flat wetlands with papermaking wastewater. Background technique [0002] my country is a big country of straw pulp papermaking, with an annual output of more than 20 million tons. Based on the average water consumption per ton of paper of about 140 cubic meters per ton, the annual discharge of straw pulp papermaking wastewater is nearly 3 billion tons, causing serious environmental pollution. At present, the treatment of papermaking wastewater is still a worldwide problem, and no effective and economical method of pollution prevention has been found. Reed is an excellent raw material for papermaking, with a fiber content of about 48%. It can produce offset printing book paper, letterpress paper, writing paper, glossy paper, typing paper, napkin paper, toilet paper, etc., but currently the national reed pulp paper only accounts for 10% of the...

AI Technical Summary

Problems solved by technology

[0010] However, at present, there are few in-depth studies on the treatment of papermaking wastewater by the ecological pond-reed wetland combination process, and the irrigation method is relatively rough. Insufficient research on irrigation technical parameters and irrigation on soil restoration and other key technologies, especially in the field conditions have not been retrieved related detailed research

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