Low-cost technology solutions in order to improve water quality of Nhue river to irrigate safe vegetables in Thuong Tin district, Hanoi city

Abstract

The study evaluated the efficiency of Nhue river water treatment for vegetables irrigation in the Tan Minh commune, Thuong Tin district, Hanoi city, using multi-layer filtration technology with low-cost natural materials. Applying this technique can improve the water quality of the Nhue River. The treatment efficiency of Total Suspended Solids (TSS) ranged from 48.7% to 67.8% due to filtration mechanisms; treatment efficiency of BOD5 and COD reached between 39.1% and 55.9% by the consumption of organic matter by microorganisms and activated carbon; treatment efficiency of NH4+ achieved from 32.9% to 45.3% by microbial decomposition mechanisms and adsorption by zeolite; treatment efficiencys of PO43- and heavy metals in the river water is very high by the ion binding in the mineral components of zeolite. This is a technology which is energy-saving, environmentally friendly, low-cost technology. Can be applied this multi-layer filtration technology to water treatment for vegetable irrigation at household scale.

Keywords: Water quality; vegetables irrigation; pollution; water treatment; Nhue river.