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Method for repairing black and odorous water caused by aquatic plant decay in lake

A compound and clear water technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, oxidized water/sewage treatment, etc., can solve the problems of insufficient and missing research on deodorization technology, and achieve the improvement of dissolved oxygen level and low cost , The effect of pre-treatment ecological security

Inactive Publication Date: 2014-03-19
NANJING INST OF GEOGRAPHY & LIMNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The control of black and odorous lake water is only initially involved in the black and odorous water caused by cyanobacteria decay and black and odorous sediment. Comprehensive prevention and control, related research on deodorization technology is obviously insufficient, or even missing, and there are few reports on technologies related to aquatic plant corruption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Prepared as follows:

[0047] Acidification: Use 30% HCL or HNO to collect the natural quartz sand 3 (V / V) Soak for 24 hours, then rinse with clean water repeatedly to remove impurities;

[0048] Burning: burn the cleaned quartz sand at 500°C for 8 hours;

[0049] Crushing: Grinding the calcined quartz sand, sieving, and selecting components between 600 mesh and 700 mesh for later use;

[0050] Surface modification: Take 600~700 mesh quartz sand and mix it with 20% CaCl at a solid-to-liquid ratio of 1:6 2 The aqueous solution was stirred and mixed, and the supernatant was filtered off after standing still, and the quartz sand after sedimentation and separation was dried at 70°C; secondly, a chitosan solution with a mass percentage of 5% was prepared, and the quartz sand was mixed with chitosan The sugar solution is mixed and stirred according to the solid-to-liquid ratio of 1:0.8, the excess solution is removed, and the powdery composite flocculant is obtaine...

Embodiment 2

[0052] Prepared as follows:

[0053] Acidification: use 40% HCL or HNO to collect natural quartz sand 3 (V / V) Soak for 24 hours, then rinse with clean water repeatedly to remove impurities;

[0054] Burning: burn the cleaned quartz sand at 550°C for 6 hours;

[0055] Crushing: Grinding the calcined quartz sand, sieving, and selecting components between 750 mesh and 850 mesh for later use;

[0056] Surface modification: Take 750~850 mesh quartz sand and mix it with 30% CaCl at a solid-to-liquid ratio of 1:8 2 The aqueous solution was stirred and mixed, and the supernatant was filtered off after standing still, and the quartz sand after sedimentation and separation was dried at 80°C; secondly, a chitosan solution with a mass percentage of 10% was prepared, and the quartz sand and chitosan The sugar solution was mixed and stirred according to the solid-to-liquid ratio of 1:1.2, the excess solution was removed, and the powdery composite flocculant was obtained by freeze...

Embodiment 3

[0058] Prepared as follows:

[0059] Acidification: use 10% HCL or HNO to collect the natural quartz sand 3 (V / V) Soak for 24 hours, then rinse with clean water repeatedly to remove impurities;

[0060] Burning: burn the cleaned quartz sand at 450°C for 10 hours;

[0061] Crushing: Grinding the calcined quartz sand, sieving, and selecting components between 200 mesh and 450 mesh for later use;

[0062] Surface modification: Take 200~450 mesh quartz sand and mix it with 10% CaCl at a solid-to-liquid ratio of 1:5 2 The aqueous solution was stirred and mixed, and the supernatant was filtered off after standing still, and the quartz sand after sedimentation and separation was dried at 60°C; secondly, a chitosan solution with a mass percentage of 1% was prepared, and the quartz sand was mixed with chitosan The sugar solution is mixed and stirred according to the solid-to-liquid ratio of 1:0.2, the excess solution is removed, and the powdery composite flocculant is obtain...

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Abstract

The invention discloses a treatment method of yellow or even black and odorous water caused by aquatic plant decay. Most of organic black colloids in water are settled by a composite flocculant, and a smelly substance residue remaining in the water is further deeply oxidized and degraded by using a composite oxidation deodorization material. The composite flocculant takes 10-50 microns of natural quartz sand as a core, and the quartz sand is subjected to surface modification by using CaCl2 and chitosan after pretreatment such as crushing, acidifying, firing and the like, so as to prepare an efficient composite flocculant. The comprehensive repair method provided by the invention is good in oxide removal effect on black and odorous substances of general water, such as sulfide protein, ammonia, amine and the like, and the removal rate is 70-90%. More importantly, the removal effect on a lot of vegetal fatty acids, nitro-compounds and indole odorous substances is 70-85%. The transparency and dissolved oxygen of the processed water are greatly improved, the sensory effects of the water are effectively improved, and a water-sediment interface microenvironment of local water is significantly improved.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to a repair method for black and odorous water bodies after aquatic plant corruption in lakes, in particular to a disposal method for efficiently removing "grass-derived" odor-causing sulfur-containing and nitrogen-containing compounds in water bodies. [0002] Background technique [0003] Near the shore of the lake bay, a large number of emergent plants, floating leaf plants and submerged plants grow. Due to the distribution of flora and fauna in the area of ​​aquatic plants, the luxuriant vegetation in the area covered by aquatic plants has poor hydrodynamic exchange capacity, and there are a large number of plant residues and rich organic matter in the surface layer of sediments. The vegetation area captures and gathers suspended particles and Cyanobacteria, vegetation stems, leaves and roots breed a large number of plankton and bacteria. Every summer and autumn,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F1/56C02F1/72C02F9/04
Inventor 古小治陈开宁杨鑫张启超
Owner NANJING INST OF GEOGRAPHY & LIMNOLOGY
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