Proposed design of anaerobic wetland system for treatment of mining waste water at former tin mining catchment

Scientific Research and Essays

Muhammad Aqeel Ashraf¹ 

关键词:  ;    Water quality;    heavy metals;    soil;    water;    constructed wetland;    wastewater treatment;    anaerobic system.;   

DOI  :  10.5897/SRE11.1605

学科分类：社会科学、人文和艺术（综合）

来源: Academic Journals

【 摘 要 】

This research provides an approach for designing a constructedwetland system for treatment of tin contaminated wastewaterfrom mining catchment. Initially, physico-chemical characteristics and concentration of heavy metals in the soil and ponds were evaluated. It was found that the soil and water quality of the area is highly degraded. This study will help for the design of the wetland for wastewater treatment. Design of wetland was mostly based on the review of scientific literature,theoretical modelling and verification of performancevia a pilot system. Thewetland system comprises of three compartments inseries: an ‘inflow’ pond receiving untreated tailingswater overflowing into a wetland compartment which in turn overflows into an ‘outflow’ pondreceiving the now treated water. Waterproofbaffles in each wetland compartment serve toincrease the flow path of the water, thereby increasingthe potential for sulphate retention. On site a computer connected tothe pumps regulates the flow of tailings waterthrough the systems. The wetland compartment of each system is filled with approximately 50 cm depth of a mixture of the cattle manure as (25%) andmunicipal waste compost (75%) as substrate. This mixture has good permeability with optimal growth of plants.Additionally 30 tonnes of limestone will be deposited at the far end of the wetland to facilitate final pH adjustment if it should be required. At thebottom of the inflow and outflow ponds in each system, a layer of about 25 cm of a 1:6 mixture ofcattle manure and municipal compost is depositedto provide a substrate for the invertebratespecies that spontaneously inhabit the systems. The planting density chosen is based on similar research on constructed wetlands. Proposed anaerobic wetland is first of its kind introduced for mining waste water treatment in Malaysia.

【 授权许可】

CC BY