Treatment and comprehensive utilization method of foundation engineering slurry

Abstract

The invention belongs to the technical field of foundation engineering slurry recycling, and discloses a foundation engineering slurry treatment and comprehensive utilization method which comprises the following steps: judging whether foundation engineering slurry is fresh slurry, circulating slurry or waste slurry; the circulating slurry is purified through a sand remover, and drilling slag and purified slurry are obtained; respectively and comprehensively utilizing the drilling slag and the purified slurry; carrying out chemical treatment on the waste mud to obtain flocculate; carrying out filter pressing treatment on the obtained flocculate to obtain a mud cake and waste liquid; and comprehensively utilizing the obtained mud cake and waste liquid respectively. The method is simple in processing procedure and low in processing cost; all drilling slag (or mud cakes) and purified slurry (or waste liquid) can be recycled, the problem of slurry discharge or outward transportation treatment of foundation engineering is solved, and remarkable economic, environmental and social benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of slurry recycling in basic engineering, and in particular relates to a treatment and comprehensive utilization method for slurry in basic engineering. Background technique [0002] At present, in foundation constructions such as underground diaphragm walls, bored piles, and rotary excavation piles, the retaining mud plays a vital role in the stability of the groove wall (or borehole), but as the concrete pouring process proceeds, the cement The retaining mud will be continuously polluted, and the latter's performance will continue to deteriorate, resulting in a large amount of waste mud. Taking an underground diaphragm wall with a groove section length of 6m, width of 1.5m and depth of 50m as an example, in order to meet the requirements of retaining wall, a total of about 450m is required 3 of fresh mud. According to the general construction process, the fresh mud will become waste mud after circulating...

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Problems solved by technology

The problem is that the transportation and treatment costs of the former are high; the mud cake in the latter cannot be effectively utilized, and the Ca in the waste liquid 2+ High concentration, direct discharge will pose a greater threat to the urban environment

The problem with this invention is that the formulation of the waste drilling mud is complex, there are many types of pollutants (even including heavy metals), and the cost of reuse of mud cake and waste liquid is extremely high

The problem with this invention is that the treatment procedure of this method is relatively complicated, and the comprehensive utilization of mud cake and waste liquid is not considered.

[0005] The inventive method disclosed in the above-mentioned patent mainly has the following deficiencies: (1) the processing procedure is complicated; (2) the processing cost is high; (3) the recycling of drilling slag (or mud cake) and waste liquid is not considered

However, when drilling slag (or mud cake) is directly used for grass seed cultivation and flower planting, etc., the plants usually cannot develop and grow normally, and an appropriate amount of nutrient soil needs to be added, and suitable grass seeds and flowers are selected; if for The waste liquid is directly used to prepare fresh slurry, where Ca 2+ The concentration and pH are both high, and the performance of the prepared slurry cannot meet the engineering requirements, so effective chemical treatment is required

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